164 CONCHYLIA— D/rijyi?^. 37. 



Pectunculus rostro productiore. Lister, Conch, tab. 289, fig. 125, 



and tab. 290, fig. 126. 

 The young shell. Lister, Conch, tab. 295, fig. 132. 

 Mus. nost. On the Western coasts. 



Shell an inch and a half long, and not quite so much in breadth, 

 thick, convex, narrowed towards the beaks on the cartilage side, 

 causing them to be much produced, generally of a clear polished 

 white color, sometimes yellowish or with a flesh-color tinge towards 

 the narrowed end, very rarely marked with broad longitudinal fawn- 

 colored stripes, as represented in our plate : glossy round the margin. 



We have specimens from Panama, which in every respect corres- 

 pond with those of our own coasts, but are about double the size. 



Tigerina. Cytherea testd suborbiculari depressd, strils decussatis, areold sub- 

 ^ trigond minutd. 



Shell somewhat orbicular and flattish, with decussate striae, and the 

 areola somewhat triangular and minute. 

 Tab. nost. 10, fig. 12. 

 Venus Tigerina. Linn. Syst. Nat. p. 1133, 1134, 

 Gmelin, Syst. p. 3283. 

 Turton, Linn. Syst. iv. p. 231. 

 Montagu, Test. p. 119, tab. 4, fig. 1, 

 Pennant, Brit. Zool. iv. p. 208. 

 Linn. Trans, viii. p. 86, tab. 2, fig. 5. 

 Turton, British Fauna, p. 168. 



