CONTENTS. Vll 



Page 



XXXIV. On the Mechanism of Aquatic Respiration and on the 

 Structure of the Organs of Breathing in Invertebrate Animals. By 

 Thomas Williams, M.D. Lond. (With a Plate.) 404 



XXXV. On the Genera of Mollusca, and on the Genus Assiminia 



in particular. By Dr. J. E. Gray, F.R.S. &c 422 



XXXVI. A few Remarks on the Brachiopoda. By Thomas 

 Davidson, Esq., F.G.S. &c. (With a Plate.) 429 



XXXVII. On the Phaenomena of the Reproduction of the Chitons. 



By William Clark, Esq 446 



XXXVIII. Note on Linaria sepium, AUman. By Charles C. 

 Babington, M.A., F.R.S. &c 449 



New Books : — Catalogue of the Genera and Subgenera of Birds con- 

 tained in the British Museum, by G. R. Gray, F.L.S. — Descrip- 

 tive and Illustrated Catalogue of the Histological Series contained 

 in the Museum of the Royal College of Surgeons. Prepared for 

 the Microscope. Vol. ii- 450 — 457 



Proceedings of the Zoological Society 457 — 464 



Shropshire Mollusca, by J. Gwyn Jeffreys; Note on the Arrested 

 Development of the Tadpole of the Common Frog, by W. Davies ; 

 List of Species of Mollusca obtained by Prof. Goodsir from 

 Spitzbergen, by R. M' Andrew, Esq. ; Meteorological Observations 

 and Table 464—467 



Index 468 



