CONTENTS. 
Transactions of the Society — 
pag a 
VII. — The Foraminifera of the Gault of Folkestone. — YI. 
By Frederick Chapman, F.R.M.S. (Plate VIII.) .. .. 421 
VIII. — On the Unreliability of certain Characters, generally 
accepted for Specific Diagnosis in the Diatomace^e. 
By Thomas Comber, F.R.M.S., F.L.S 428 
SUMMARY OF CURRENT RESEARCHES. 
ZOOLOGY. 
A. VERTEBRATA : — Embryology, Histology, and General. 
a. Embryology. 
Sedgwick, A . — Von Baer's Law and the Significance of Ancestral Rudiments in 
Embryonic Development 433 
Weismann, A . — Effect of External Conditions on Development 434 
Ziegler, H. E. — Yolk-nuclei in Meroblastic Ova 435 
Blanc, H . — Fertilization of Trout's Ovum 435 
Rose, C . — Development of the Teeth in the Adder 435 
Field, H. H . — Development of Excretory System in Amphiuma 435 
Beard, J . — Development of the Thymus 436 
Lendenfeld, R. yon — Haacke's Theory of Gemmaria 436 
j8. Histology. 
Minchin, E. A . — Microscopic Foam and Protoplasm 437 
Bernard, H. M . — Relations of Isotropous to Anisotropous Layers in Striped ig 
Muscles 437 
y. General. 
Wallace, A. It . — Zoological Regions 437 
Fredericq, L . — Autotomy in the Animal Kingdom 438 
Herdman — Zoology of Irish Sea 438 
Frebault, A . — Chemistry of Organisms 438 
Garstang, W . — Phytogeny of Chordata 438 
B. INVERTEBRATA. 
Alcock, A. — Deep-sea Invertebrates of Indian Ocean 439 
Giard, A . — Dimorphism due to Parasitism 439 
Lauterbobn, R. — Winter Fauna of the Upper Rhine .. .. 440 
Mollusca. 
Frenzel, J . — Histology of Mid-gut Gland 440 
y. Gastropoda. 
Samassa, P . — Nerves of Oculiferous Tentacle of Helix pomatia 440 
Henking, H . — Hydrobia ulvge . . 440 
Plate, L . — Circulatory and Renal Organs of Chitons 440 
5. Iiamellibranchiata. 
Nagel, W. A . — Sense of Light in Eyeless Bivalves 441 
Toureng — Circulatory System of Dreissensia polymorpha 442 
Molluscoida. 
a. Tunicata. 
Seeliger, O. — So-called Segmentation of the Tail in Appendicularia 442 
Caullery — Degeneration of Distaplia 442 
B. Bryozoa. 
Vangel, E . — Bryozoa of Hungary 442 
Arthropoda. 
Dana, J. D . — Derivation and Homologies of some Articulates 442 
