CONTENTS. 



Transactions of the Societx — Tm% 



I. — Fresh-water Alg^e (including Chlorophyllous Protophyta) 

 of the English Lake District. II. With descriptions of 

 a new genus and five new species. By Alfred W. Bennett, 

 F.R.M.S., F.L.S., Lecturer on Botany at St. Thomas's 



Hospital (Plate I.) I 



II. — Note on Micrasterias Americana, Balfs, and its Varieties. 



By W. M. Maskell, F.K.M.S. (Plate II.) 7 



III. — Note on the Minute Structure of Pelomtxa palustris. 



• By G.Gulliver 11 



SUMMARY OF CURRENT RESEARCHES. 



ZOOLOGY. 



A. VERTEBRATA :— Embryology, Histology, and General. 



a. Embryology. 



Letdig, F. — Animal Ovum 13 



Carini, A. — Maturity of the Ovum 15 



Schultze, O. — Axis of Frog Ovum 15 



Kaczandeb, J. — Relation of Medullary Canal and Primitive Streak 15 



Jensen, O. S. — Spermatogenesis 16 



Janosi'k, J. — Two Young Human Embryos 16 



Geblach, L. — Experimental Embryology 16 



j3. Histology. 



Lukjanow, S. M. — Morphology of the Cell 17 



„ „ Nuclei of Muscle-cells 18 



Tangl, F. — Cell-division 18 



y. General. 

 Amans — Aquatic Locomotion 19 



B. INVERTEBRATA. 



Mollusca. 



#. Gastropoda. 



Lacaze-Duthiees, H. de, & G. Pruvot — Larval Anal Eye in Opisthobranch 



Gastropods 19 



Lacaze-Duthiers, H. de — Nervous System of Aplysia 20 



Bocvier, E. L. — Nervous System of Prosobranchs 21 



Sarasin, P. & F. — Development of Helix Waltoni 24 



Grobben, C. — Morphology of the Heteropod Foot 24 



y. Pteropoda- 



Pelseneer, P. — Nervous System of Pteropods 25 



„ „ ' Challenger ' Pteropoda (Gymnosomata) . . .. 26 



3. Liamellibranchiata. 

 Dubois, K. — Photogenic Property of Pholas dactylus .. .. 26 



