CONTENTS. 



Transactions of the Society— ^aqz 



VI. — A Eevision of the Tkichiaob^. By George Massee. (Plates 



v., VL, VIL, and VIII.) .. .. .. .. 325 



SUMMAHY OF CTJUIIEKT KESEARCHES. 



ZOOLOGY. 

 A. VERTEBIIAT A : — Em'bryology, Histology, and General. 



a. Smtoryolog'y. 



GASK-EhL, W. B..— Origin of Nervous System of Vertehrates 360 



Ebnee, V. V. — Protovertehrx and the Segmentation of the Vertehral Column .. .. 362 



TaiSAhix, C— Study of a Human JEmlri/o .. .. 362 



Hbnnegtjy, F, — Development of Bony Fishes .... .. 363 



Lankester, E. Ray— Structure of Amjjhioxus lanceolatus .. . . . . . . . . 363 



Verson, E. — Spermatogenesis .. 364 



BiONDi, D. — Spermatogenesis in Man .. 365 



Platnek, Gr. — Import of Polar Globules . . . . . . . , . . 365 



BoEN, G. — Segmentation in Double Organisms . . 366 



j3. Histolog-y. 



Platnee, Gr. — ^Structure of the Cell and Phenomena of its Division 366 



Deogoul — Process of Ossification . . . . . . 367 



■y. General. 



GuERNE, J. DE, & J. KiCHAED — Fresh-water Fauna of Greenland 367 



B. INVERTEBRATA. 



KowALETSKT, A. — Excretory Organs .. .. ,. .. 368 



Mollusc a. 



Pelseneee, P. — Anatomy of Deep-sea MoUusca .. .. .. .. .. 869 



a. Cephalopoda. 



Dewitz, H. — Structure of Silurian Cephalopods .. .. .. .. .. 369 



YiALLETOJsr, L. — Development of Sepia 370 



y. Gastropoda. 



KoEHLEE, E. — Double Forms of Spermatozoa ..' 371 



Gaenault, p. — Fertilization in Helix aspersa and Arion empiricorum . . . . . . 372 



Bbock, J. — Neurology of Prosobranchiata . . 372 



Egbert, E. — Hermaphroditism of Aplysise 273 



Beegh, E. — Genera of ^olidiidse . . . . . . . . 374 



Smith, E. A. — New Genus of Parasitic Mollusca .... .. .. 374 



5. liamellibrancliiata. 



Thiele, J. — Abdominal Sensory Organs in Lamellibranchiata .. ., 374 



Menegaux, A.^ — Turgescence in Lamellibranchs 375 



Jackson, E. T. — Development of Oyster and Allied Genera .. 375 



Eydee, J. A. — Byssus of young of common Clam . . 375 



FiscHEE, K. — Distribution of Unio margaritifer .... . , 376 



Molluscoida. 

 a. Tunicata. 



Hebdman, "W. A. — Tunicata of the Voyage of the ^ Challenger ^ ., 376 



ToDAEO, F. — Branchial Homologies of Salpa .. ., r. ■■ .. 376 



Lahille, F. — Belation of Tunicata to Vertehrata . . . . : . . 376 



