CONTENTS, 



Page 



Art. LIV. Notice of the occurrence oj a species of Duck 

 ■^ new to the British Fauna. By William Yarrell^ 



Esq. F.L.S 492 



Art. LV. Description of a new Species of Astacus found 

 in a Fossil State at Lyme Regis, in Dorsetshire, com- 

 municated by H. T. De la Beche, Esq. FRS., Sfc. 

 By G. B. SowERBY, F.L.S., Sfc 493 



Aht. LVI. Descriptions of two new Species of Cyprcea^ 

 principally extracted from " J Catalogue of the Shells 

 in the Collection of the late Earl of Tankerville." By 

 G. B. SowERBY, F.L.S., Sfc 494 



Art. LVII. On certain Organs of the Heltcidce usually 

 regarded as their Eyes : tcith a summary of evidence 

 in support of Jristotle's assertion that the Testa- 

 ceous Mollusca are devoid of Visual Organs. By 

 E. W. Bray LEY, jun. A.L.S. 497 



Art. LVI 1 1. Descriptions of some rare, interesting, or 

 hitherto unchuructerized Subjects in Zoology. By 

 N. A. Vigors, jun. Esq. M.A., F.R., L.,Sf G.S.; with 

 Figures by J. De Carle Sowerby, Esq. F.L.S 510 



Art. LIX. A Description of two new species of Coleop- 

 terous Insects belonging to the genera Cremastocheilus 

 and Priocera. By the Rev. William Kirby, F.R.S. 

 Si L.S., Sfc 516 



Aut. LX. Additions and Corrections to Mr. Vigors's 



Sketches in Zoology 518 



Art. LXI. Analytical Notices of Books : — 



Histoire Naturelle des Mammiferes, Sfc 522 



Temminck's Monogruphies de Mammalogie 526 



Me mo ires de la Societe d' Histoire Naturelle de Paris. . 534 



Klug^s Entomologische Monographien 538 



Philosophical Transactions of the Royal Society of 



London. For the year 1825 540 



Sowerby's Genera of Recent and Fossil Shells 543 



