CONTENTS. 
Transactions of the Society — 
PAQB 
IX. — Notes on the Podura Scale. By Alfred Letherby, 
F.R.MS. (Plate VII.) 397 
X. — Development of the Young Valve of Trachyneis 
aspera Cleve. By Thomas Comber, F.R.M.S., F.L.S. 
(Plate VIII.) 400 
XI. — On the Anatomy of Nyctotherus ovalis. By Wm. 
Cecil Bosanquet, M.A., Fellow of New College, Oxford. 
(Communicated by Prof. F. Jeffrey Bell, Sec. R.M.S.) 
(Plate IX.) 404 
SUMMARY OF CURRENT RESEARCHES. 
ZOOLOGY. 
VERTEBRATA: — Embryology, Histology, and General, 
o. Embryology. 
MacBride, E. W. — Sedgwick’s Theory of the Embryonic Phase of Ontogeny as an 
aid to Phylogenetic Theory 407 
Broom, R . — Significance of the Proliferated Epithelium in the Foetal Mammalian Jaw 408 
Francois, P . — Development of Vessels and Blood in the Great Omentum of the Babbit 408 
Brachet, A . — Development of the Hepato-enteric Diverticula of the Axolotl , and of 
the Peritoneal Cavity of Mammals 409 
Wilson, J. T., & others — Young Monotremes 409 
Will, L . — Gastrulation of Lacerta 410 
Morgan, T. H . — Experiments with Frogs’ Eggs I 410 
Valenti, G . — Development of the Hypophysis 411 
Driesch, Hs . — Theory of Development 411 
Nusbaum, J. — Hertwig’s Theory of Development 412 
Rath, O. vom — A Case of Apparent Telegony 413 
Kukenthal, W . — External Traces of Hind Limbs in Cetacea 413 
/3. Histology. 
Ryder, J. A . — Bed Blood-corpuscles of Vertebrates 413 
Dreyer, F . — Organic Structure 414 
y. General. 
Bennett, A. W . — What is a Tendency ? 415 
Frankland, G. C . — Action of Light on Animal Life 415 
Helm, F . — Numerous Variations in One Individual 416 
Rohde, F . — Origin and Inheritance of Individual Characters and Diseases .. .. 416 
Schulze, E . — Physiological Chemistry of Plants and Animals 416 
INVERTEBRATA. 
Mollusca. 
Gilchrist, J. D. F . — Torsion of Body of Mollusca 416 
a. Cephalopoda. 
Lenhossek, M. v . — Betina of Cephalopods 417 
Mitsukuri, K., & Ikeda, S . — Gigantic Cephalopod from Japan 417 
A Pteropoda. 
Peck, J. I . — Pteropoda of the ‘ Albatross’ Expedition 418 
y. Gastropoda. 
Peck, J. I . — Heteropoda of the ‘ Albatross’ Expedition 418 
Villepoix, Moynier de — Formation of Snail Shell ii$ 
