4r 



author remarks tliat the pia of that fhell ri(e into thin, 

 membranaceous, acute ridges, whereas this has large ele- 

 vated rids^es, obtufely rounded. It is alfo remarked that 

 V. lactea is a much thicker and heavier fliell than any other 

 refembling it. Diameter about an inch and a half. 



Our prefcnt fpecies (fays the author) we are informed, is 

 found on the wefiern coall. 



Venus Cassina, Lin. Si/st. p. 1130.— Gmel. Syst. p. 3269. Cassina. 

 Clicm Conch, vi. t. 29. f. 301-302. 

 L'ui. Trans, viii. p. 79. t. 2. f. 1. 



Shell thick, white with brown lines, furnifhed with nume- 

 rous tranfverfe, recurved, acute lamince ; the pofterior mar- 

 gin crenulated, and grooved behind the beak : the umbo is 

 reddiih ; deprellion behind the beak brown. Diameter one 

 inch and a half. 



This f]jecies, we are informed by the authors of the De- 

 fcn'ptive CaUilogue of Brilijlj Tejlacea, has been found by Mr. 

 M'^Leay, on the coaft of Caithnejs. 



Whether the figure of a worn fliell, given by Mr. Pen- 

 nant for Venus Erycina, Br. Zool, iv. t. 54,, f. 48. A. is the 

 Cajfuia, mufl: we fear, be left to conjeclure, fmce thatlhell 

 afllimes fuch various appearances, under different circum- 

 ftance.s ; but it is by no means improbable. 



GuiNEENSIS. 



