CONTENTS. 



Page 

 AuT. XLIX. On tlie vestiges of a placental Organization^ 



and of an umbilicus, discovered in a very small Vwtus of 



the Didelphis Virginiana. Bij M. E. Geoffroy de 



Saint-Uilaire 403 



Art. L. Observations on the Structure of the Pholades. By 



John EotrARD Gra t, Esq. M.G.S. 406 



Art. LI. Bescriptiuus of some rare^ interesting^ or hitherto 

 uncharactei ized subjects if Zoology, by N. A. Vigors j 

 jun. Esq. M.J. F. L.S. With Figures by James De 

 Carle Suwerby, Esq. F.L.S. 409 



Art. LIl. Proceedings of Learned Societies : — 



Zoological Club of the Linnean Society 418 



Royal Academy of Sciences of Paris 421 



Art. LIII. — Scientific Notices : — 



NezD Species of Procellariw 425 



Bulla Ilaliotoidea 427 



On the Genera Sigaretus and Cryptostoma , . 427 



EXPLANATION OF THE PLATES. 



Cypraea lentigiuosa. 

 albuginosa. 

 Turdus. 

 avabicula, n. 4. 

 sulcidentata, n. 20. 

 arenosa, n. 19. 

 contioversa, n. 15. 

 zoiiata, n. 53. 



pulclira, n. 14. See n. 42, p. 380. 

 pitta, n. 34. 



Plate XIII. — Muscicapa Lathami, p. 410. 



Plate XIV. — Antluis Ricliaidi, ;j. 411. 



Plate XV. — Fig. 1. Ciciiidela princeps, p. 413. 



2. Kltcliii, p. 414. 



^'. Lyonii, p. 414. 



4. Gyninetis undulata, p. 410. 



5. hieroj;lyphica, p. 41C. 



6. Maciaspis clavalu, p. 41 (j. 



7. Rutela nitcscens, p. 417. 



8. Lamia V notata, ib. 



9. perpulchra, p. 418. 



Plate XVI.— P-itlarula Kiihlii, p. 412. 



