136 CONCHYLIA— />Jr/iriR4. 35. 



is chalky white, rounded^ a little sloping and produced on the 

 cartilage side, finely striate transversely : beaks pointed, curving 

 to one side, without any impression under them : inside chalky 

 white but not glossy, with the margin plain and very sharp 

 edged. 



frianguiaris. Cyprina testd subtvibond loivi, areola posited lanceolatd, 

 valvd alter d tridentatd. 

 Shell somewhat triangular smooth, with the liinder impression 

 lanceolate, and three teeth in one of the valves. 

 Tab. nost. II, fig. 19,20. 

 Venus triangularis. Montagu, p. 577, tab. 17, fig. 3. 

 Linn. Trans, viii. p. 83. 

 Turion, British Fauna, p. 160. 

 Pennant, Brit. Zool. iv. p. 205. 

 JDil/wyn, Descript. Catal. p. 173. 

 Turlun, Conch. Diet. p. 238. 

 Mus. nost. Western coasts, and Dublin bay. 



Shell about half an inch in diameter, strong, roundish with a 

 triangular outline towards the beaks which are produced and 

 equally sloping on both sides ; the surface smooth, or marked 

 with a few transverse lines of annotinatioii : in one valve two 

 teeth and a curved lateral one ; in the other three teeth and a 

 lateral one. 



rompiessa. Cyprina testd trigono- orbiculari subcompressd, costulis trans- 

 nersis remotiiisculis, areola posiicd elongatd, dentibus 

 duobtis 



