CONTENTS, 
Transactions of the Society — P4QB 
I. — Further Notes on the Monochromatic Illuminating Appa- 
ratus. By E. M. Nelson, F.R.M.S. (Plate I.) 1 
II. — Freshwater Alg® and Schizophyoe® of South-west Surrey. 
By Alfred W. Bennett, M.A., B.Sc., V.P.L.S., V.P.R.M.S., 
Lecturer on Botany at St. Thomas’s Hospital. (Plate II.) .. 4 
SUMMARY OF CURRENT RESEARCHES. 
ZOOLOGY. 
A. VERTEBRATA Embryology, Histology, and General. 
a. Embryology. 
Driesch, Hs., & K. Fiedler — Developmental Mechanics 13 
Hartog, M . — Some Problems of Reproduction .. 14 
Bonnet, R . — Elements of Development of Domestic Mammalia 15 
Giacomini, E . — Development of Seps 15 
Robinson, A., & R. Assiieton — Formation and Fate of Primitive Streak .. .. 16 
0. Histology. 
Butschli, O . — Structure of Protoplasm 17 
Ziegler, H. E., & others — Amitotic or Direct Nuclear Division 18 
Kolliker, A . — Relations of the Essential Elements of the Nervous System to one 
another 18 
Bardeleben, K . — Minute Structure of Human Spermatozoa 19 
y. General. 
Frenzel, J . — Primitive Movements of Animals 20 
Friedlander, IS . — On the Study of the Movements of Animals 21 
B. INVERTEBRATA. 
Mollusca. 
a. Cephalopoda. 
Watase, S . — Cleavage of Ovum in Cephalopods 21 
Hoyle, W. E . — Illex eblanrn 22 
y. Gastropoda. 
Erlangeb, R. v . — Development of Paludina vivipara 22 
„ „ Development of Bythinia tentaculata 24 
Bergh, R . — Cryptobranchiate Dorididx 25 
Mazzarelli, G . — Reproductive System of Teetibranchiata 25 
Cunningham, J. T . — Pleurophyllidia Loveni 26 
Gamble, F. W . — Occurrence of Hancoclcia at Plymouth 26 
Mazzarelli, G. F . — Reproductive Apparatus of Aphjsiidx 26 
Parona, C . — The Dorsal Appendages of Tethys leporina 27 
Molluscoida. 
a. Tunicata. 
Salensky, W . — Embryology of Pyrosomidx 27 
0. Bryozoa. 
Davenport, C. D . — Budding in Paludicella and other Bryozoa 28 
Arthropoda. 
Exner, S . — Facetted Eyes of Crustacea and Insects (Figs. 1 and 2) 30 
Wheeler, W. M . — Neuroblasts iu Arthropod Embryos 31 
