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, coni' 

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

 ByG.B.SowERBYy F.L.S., 8^c 493 



AiiT. LVI. Descriptions of two new Species of Cyprcea, 

 principally extracted from " A Catalogue of the Shells 

 in the Collection of the late Earl of Tankerville,^^ By 

 G. B. SowERBY, F,L.S., <^c 494 



Art. LVII. On certain Organs of the Helicidce usually 



regarded as their Eyes : with a summary of evidence 



in support of Aristotle's assertion that the Testa- 



- ceous Mollusca are devoid of Visual Organs, By 



E, JV, BiiAYLEYjun, A,L,S 497 



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

 hitherto uncharacterized 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. 



Sf L.S., Sfc. c 516 



Art. LX. Additions and Corrections to Mr. Vigors^ s 



Sketches in Zoology 518 



Art. LXL Analytical Notices of Books : — 



Ilisloire Naturelle des Mammiferes, Sfc 522 



Temminck's Mono graphics de Mammalogie 526 



Me moires de la Societe d'llistoire Naturelle de Paris. . 634 



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 



