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EXPLANATION OF PLATE I,Illustrating G. O. Sars's Paper on Rhabdopleura.

FIG.1.The animal taken out of the cell and slightly compressed, seen from

the left side.c. Buccal shield.d. Tentacular arms.e. (Esophagus./. Stomach.g. Intestine.h. Contractile cord.I. Hyaline semilunar border at base of tentacular arms.m. The under lip.n. The ciliated tubercle at the base of the tentacular arm.p. The flexor muscle of the tentacular arm.q. The buccal aperture.r. The cellular body between the end of the intestine and the

oesophagus.2.The animal seen from the ventral side.

(Letters as in fig. 1.)3.The animal seen from the dorsal side.

(Letters as in fig. 1.)4.The anterior part of the body seen from in front; c, d, I, as in fig. 1.5.A part of a living colony magnified about sixteen times.

aa. The cells with their polypides in different states of The creeping The buccal shield.eld. The tentacular arms.

ff. The stomach.g. The intestine./(/*. The contractile cord.ii. The axial cord.

6.A piece of the creeping stem freed from adhering particles, togetherwith the bases of the cells and their polypides mostly strongly re-tracted, about 20 times magnified, showing the single chambers intowhich the stem is divided.

cc. The buccal shield.ff. The stomach.hh. The contractile cord.ii. The axial cord.

7.The earliest stage of development noticed.8.A further developed polypide seen from the dorsal side ; cc, the buccal

shield; d, the tentacular arms; h, the contractile cord.9.The same polypide with the axial cord (') seen from the ventral




Illustrating Mr. C. S. Tomes's Paper on the Development ofthe Teeth, in an Armadillo.

PIG.1.Section through the lower jaw of a foetal calf, 6 inches long.

a. Meckel's cartilage.b. Dentine germ.e. Enamel organ.d. Process connecting the enamel germ with the deep layer of the

oral epithelium.e. Epithelium heaped up over the situation of the developing tooth.y. Enamel germ of the successional permanent tooth.

2.From the lower jaw of


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To illustrate MM. Van Tieghem and Le Monnier's Researcheson the Mucorini.

Pig. 1.Section of a zinc box for cell-cultures; it is arranged to holdtwo rows of slides, and is closed above by a glass plate; the bottom iscovered with wet sand or moistened plaster.

Phycomyces nitens.

Pig. 2.a, spherical spores from small sporangia, the central grannies areyellow; b, fresli, elongated, ellipsoidal or concavo-convex spores from largesporangia; c, older spores, the wall has a double contour; d, older sporesgerminating with rupture of the exospore (x 160).

Fig. 3.a, spores in process of alteration in a moist medium, the proto-plasm condenses into nodules; b, a germinating hypha in process of destruc-tion, its base still inclosed in the epispore is partitioned off, and the containedprotoplasm is condensed into oval corpuscles (X 320).

Figs. 412.Successive stages in the development of a zygospore ;46, before the development of the processes (X 40); 7, 8, processesmaking their appearance from above downwards upon one of the arcuatecells (X 40); 911, their appearance upon the other arcuate cell simul-taneously with the increase in the size of the zygospore (9 x 120, 10 and11 X 40), in fig. 11 a slight traction has been applied to the two conjugat-ing filaments; 12, mature zygospore enveloped by the dichotomous processes,many of which are broken (x 50).

Fig. 13. Side of attachment of an arcuate cell with processes radiatingall round (x 40).

Fig. 14.""Vice" arrested in its development; the first process is developedin its ordinary position, but has been prolonged and developed into ordinarymycelial hyph (X 120).

Fig. 15.Base of a sporangiferous hypha (a) ; tb, sterile branches (cell-culture) (X 120).

Fig. 16.Group of three small sporangia inserted with two sterile brancheson a branch (a) of the mycelial hypha (m) (cell-culture) (X 120).

Fig. 17.Basal dilatations of lateral branches (b, b) of a mycelial hypha(cell-culture) (x 120).

Thamnidiiini elegans.Fig. 18.Different stages of the fructification.Fig. 19.Mycelium which has produced(i) a large sporangium, (ii) a

dichotomy of eight small sporangia, (iii) a secondary lateral dichotomy ofmonosporic sporaugioles.

Pig. 20.MonospwxS sporangioles with granular walls ( x 250).

Chmtostylum, Fresenii.

Fig. 21.Lateral branch inserted, with numerous others, on the topof a bypha; it terminates in a point, and bears two false verticils of branch-lets. The lower sporangioles are of the fourth, the upper of the thirdorder (X 250).

Chatocladium Jonesii.

Fig. 22.Fruiting hypha terminating in a point, and bearing upon amiddle dilatation monosporic sporangia with granular walls aud simple ordichotomous pedicels (X 270).

Fig. 23.a, a monosporic sporangium, with a portion of its pedicel; 6,one ruptured by pressure, showing the inclosed smooth spore; c, c, sporesentirely freed from their sporangia; d. a spore escaping from its sporangiumat the commencement of germination (X 270).

Eigs. 2427.Successive stages of germination.Fig. 28.Granular-walled balloon-like bodies terminating some of the

branches (x 270).Fig. 37.Successive stages of fructification in cell-culture.

Chatocladium Brefeldii.

Fig. 29.Mycelium proceeding from a single spore after sixty-sevenhours ; the lateral processes are only figured on a single branch (a).

Fig. 30.End of a principal branch after five and a half days: a lateralprocess (c) has developed a sporangiferous branch (d), of which tlie aerialportion is shaded; it bears fertile branches (( and/"), and also sterile ones,at its base ( x 190).

Fig. 31.Extremity of a hypha after four and a'hiili' days' culture; one ofits branches (a) is prolonged into an aerial filament, bearing laterally nu-merous groups of ripe sporangia ( x 190).

Fig. 32.One of these groups of monosporic sporangia (x 400).Figs. 33, 34.Lateral processes in contact with a hypha of Mucor

Mucedo(x 400).Fig. 35.Three spores (s, s', $') which have germinated, and the hyphse of

which have fused (x 190).Fig. 36.Two branches of a hypha which have fused, forming a loop

(x 190;.


F/G. 2.



Illustrating Mr. Darwin's paper on the Anatomy of theSympathetic Ganglia of the Bladder in their Relation tothe Valvular System.


1.Posterior surface of the bladder of a young dog, stained with chlorideof gold, seen under a very low power. It shows the distribution ofnerve-trunks and ganglia in relation to large branches of blood-vessels.The blood-vessels are coloured green, the nerve-trunks and gangliaare purple.

2.From a dog's bladder stained in chloride of gold, showing an arteryand vein with the accompanying plexus of nerve-trunks and ganglia.Hartnack, No. 4.

A,. Artery (red).A2. Vein (blue).B, B. Nerve-trunks (purple).c, c. Ganglia (purple).



3.Prom the bladder of a rabbit, stained with chloride of gold, showingan artery and two ganglia. The larger ganglion fl) is surrounded bya plexus of capillaries. A nerve-trunk from each ganglion passesdown to supply the artery. Hartnack, No. 5.

A. Artery.B, B. Nerve-trunks.c, c. Ganglia (i, and n).

a. The place where the nerve-trunks disappear in the ad -ventitia.

e f. Transverse line at which the nerve-trunk from ganglion iis supposed to be interrupted.

Bj and Bj. Nerve-trunks which ought to be continuous with eachother, and to connect the ganglia I and II together.

BD. Capillaries.4.Nerve-trunk arising from ganglion n of fig. 3, and supplying the artery

A of the same figure. Hartnack, No. 2.A. Artery.B. Nerve-trunk.a. Nerve-fibres ending in the artery.D. Capillaries.

5.From the bladder of a dog stained with chloride of gold. Hartnack,No. 5.

A. Artery.~&x and av Nerve-trunks arising from ganglia situated close

together on a nerve-trunk not shown in the figure.

a. Nerve-fibres ending in the adventitia.

6.Ganglion situated on a large nerve-trunk, with smaller accessoryganglion, from the bladder of a dog stained with cliloride of gold.Hartnack, No. 5-



Illustrating Ernst Haeckel's memoir on the Gastraea-Theory,the Phylogenetic Classification of the Animal Kingdom,and the Homology of Germ-Lamellae. Translated byE. Perceval Wright.

Plate VII contains a schematic section through the young stages of re-presentatives of all the different phyla of Metazoa, and will give a clear idea,not only of the homology of both primary germ-lamellse, but also of the originof the four secondary germ-lamellse. Kgs. 18 are schematic longitudinalsections; figs. 916, schematic cross sections. In all the figures theprimary inner germ-lamella (ventral lamella, entoderm, vegetative germ-lamella), including the parts derived therefrom, is indicated by the red colour;while, on the other hand, the primary outer germ-lamella (dermal lamella,exoderm, animal germ-layer) is indicated by blue. The letters are through-out the same.

a. Primitive intestine (progaster); primitive intestinal tube.b. Ventral lateral hollow muscles.c. Ccelom (body-cavity or pleuro-peritoneal cavity).d. Intestinal glandular layer (mykogastral layer).e. Dermal layer (exoderm); outer primary