CONTENTS 
Transactions of the Society — PAGK 
VI. — On some Methods of preparing Diatoms so as to exhibit 
CLEARLY THE NATURE OF THEIR MARKINGS. By C. 
Haughton Gill, F.C.S., F.R.M.S. (Plate VII.) 425 
VII. — On a Simple Form of Heliostat, and its Application to 
Protomicrography. By Thomas Comber, F.L.S. (Figs. 
48-50) 429 
SUMMARY OF CURRENT RESEARCHES. 
ZOOLOGY. 
A. VERTEBRATA: — Embryology, Histology, and General. 
a. Embryology. 
Bemmelen, J. F. van — Inheritance of Acquired Characters 435 
Hubrecht, A. A. W . — Studies in Mammalian Embryology — The Placenta .. .. 435 
Ryder, J. A . — Acquisition and Loss of Food-yolk , and Origin of the Calcareous 
Egg-shell 437 
Wiedeksheim, R . — Development of Proteus anguineus .. 438 
Kellogg, J. L . — Pronephros of Arnbly stoma punctatum .. 439 
Eigenmann, C. H. — Egg-membranes and Micropyle of Osseous Fishes 439 
Wilson, H. Y . — Development of Serranus atrarius 439 
Watase, S . — Karyokinesis and Cleavage of Ovum 440 
P. Histology. 
Hartog, Marcus M . — The state in which the Water exists in Live Protoplasm .. 441 
Rath, O. vom — Peculiar Polycentric Arrangement of Chromatin 443 
Ewell, M. D . — Micrometric Study of Red Blood-corpuscles .. .. 444 
Kolliker, A . — Histology of Central Nervous System 444 
Errera, L . — Does a Magnet affect Karyokinesis 445 
Roule, M. L . — Origin of Nerve-centres of Coelomata 445 
Norman, A. M . — 4i British Area” in Marine Zoology 446 
B. INVERTEBRATA. 
Thurston, E . — Marine Invertebrate Fauna of the Gulf of Manaar 446 
Fewkes, J. W . — Neiv Invertebrates from the Coast of California 446 
Groom, T. T., & J. Loeb — Heliotropism of Nauplii and Movements of Pelagic Animals 446 
Mollusca. 
Norman — Revision of British Mollusca 446 
Binney, W. G . — Terrestrial Air-breathing Molluscs of United States 447 
y. Gastropoda. 
Bergh, R . — Nudibranchs collected by the ‘ Blake ’ 447 
Mazzarelli, G. F . — The “ Opaline Gland ” of Aplysiidse 447 
5. Lamellibranchiata. 
Pelseneeb, P. — Two new Hermaphrodite Lamellibranchs 448 
Molluscoida. 
a. Tunicata. 
Lacaze-Duthiers, H. de, & Yves Delage — Anatomy of the Cynthiidx .. .. 448 
&. Bryozoa. 
Jelly, E. O . — Synonymic Catalogue of Recent Marine Bryozoa 449 
MacGillivray, P, H . — South Australian Polyzoa .. .. 449 
