CONTENTS. 



Transactions of the Society — page 



I. TWENTY-FOUE NeW SpECIES of EoTIFERA. By P. H. GoBSG, 



F.R.S., Hon. F.E.M.S., &c. (Plates I. and II.) .. .. 1 

 II, — Fresh-watee Alg^ (including Chloeophyllaoeous Peoto- 

 phyta) of North Coenwall ; with desceiptions of six new- 

 species. By Alfred W. Bennett, F.R.M.S., F.L.S., Lecturer 



on Botany at St. Thomas's Hospital. (Plates III. and IV.) 8 

 III. — On Impeovements of the Miceoscope with the aid of New 

 Kinds ob" Optical Glass. By Prof. E. Abbe, Hon. 



F.E.M.S 20 



IV. — Notices of new American Fresh- watee Infusoria. By 



AKred C. Stokes, M.D. (Plate V.) 35 



SUMMARY OF CXJBBENT RESEARCHES. 



ZOOLOGY. 

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

 a. Embryology. 



His, W. — Embryonic Ganglion-cells 41 



Heape, W. — Development of the Mole 41 



Dabeste, 0. — Influence of the vertical position on the development of the Eggs of 



the Chick 42 



Thin, G. — Nucleus in Frog's Ovum 42 



Wenckebach, H. F. — Embryology of Teleostei 42 



BuooK, Q.—Belation of Yolk to Blastoderm in Teleostean Fish-ova 43 



Ryder, J. A. — Origin of Pigment-cells ivhich invest the Oil-drop of Pelagic Fish- 

 embryos 43 



KoLLMANN, J, — Segmentation of Selachian Ovum 43 



Beddabd, F. E. — Ovarian Ovum of the Dipnoi 44 



Ihering, H. T. — Alternation of Generations in Mammalia 44 



Hertwig, R. & O. — Experimental Investigation of Fertilization ., 44 



Weismann, A. — Importance of Sexual Beproduction for the Theory of Selection .. 45 



Zacharias, O. — Chemical Comparison of Male and Female Elements 45 



Balensky, W. — Primitive form of Metazoa 46 



3. Histology. 



Altmann, R. — Studies on the Cell 46 



Erbera, L. — Fundamental Condition of Equilibrium in Living Cells 46 



List, J. H. — Structure of Glandular Cells 47 



„ „ Goblet-cells _ 47 



Jaworowski, a. — Endogenous Cell-multiplication . . . . 48 



Frenzel, J.^ — Cilia 49 



NiKOLSKY, W. — Formation of Vacuoles in red-blood Corpuscles 50 



List, J. H. — Wandering Leucocytes in Epithelium 50 



JJiKVAlAonis,^. a.— Genesis and Death of Muscle-fihre 50 



7- General. 



Tiebe — Colour-sense 51 



Hermann, L. — Influence of Electric Currents on Tadpoles 51 



B. INVERTEBRATA. 



Roedel, H. — Minimum Temperature consistent icith Life . . . . 52 



Delage, Y. — Nev) Function for Invertebrate Otocysts .. 62 



MacMcnn, C. a. — Function of the Malpighian Tubes of Insects and Nephridium 



of Pulmonale Mollu^ca 52 



Imhof, O. E. — Pelagic Microzoa of the Baltic 52 



Asper, G. — Microscopic Organisms in Fresh Water 53 



Schneider, R. — Amjihibious Life in Bhizomorpha 53 



