CONTENTS. 



Paiie 



Art. XL. The generic and specific Characters^ Sfc. of 

 Ophidian, Chelonianj and Batrachian Reptilia, disco- 

 vered hy M. Spix in Brazil 329 



^, Art. XLI. On the Genus Psaris of M. Cuvier, with an 

 Account of two new Species. By William Swainson^ 



Esq. F.R. Sf L.S 354 



Art. XLIf. On the Isocardia Cor of the Irish Seas. By 



the Rev, James Buljter, F.L.S., Sfc 357 



Art. XLIII. Description of some new British Shells; 

 accompanied by Figures from the original Specimens. 



By Dr. TuRTON 361 



Art. XLIV. Sketches in Ornithology ; or, Observations on 

 the leading Affinities of some of the more extensive groups 

 of Birds. By N. J. Vigors, jun. Esq. M.J. F.L.S.. 368 



On the Groups of the Vultimda; 368 



On a new Genus of Falcotiidce 385 



On a new Genus ofPsittacidcB 387 



On the Arrangement of the Genera of Birds 391 



Art. XLV. Analytical Notices of Books : — 



Cuvier's Animal Kingdom by Griffith 406 



Curtis^s British Entomology 408 



Journal of the Academy of Natural Sciences of Phila- 

 delphia . 410 



Histoire Naturelle des Mammiferes, Sfc 415 



Memoires du Museum d' Histoire Naturelle 424 



M. Latreille^s Families Natiirelles du Regne Animal . . 427 

 Mannerheim's Monograph of the Genus Eucnemis .... 430 

 Meigen^s Systematic Description of the known Diptej'ous 



Insects of Europe 431 



