CONCHOLOGY. 45 



P. lucinalis. P. chamoides. 



P. striata. P. pholadiformis. 



P. costellata. P. labagella. 



P. linquatula. 



3. Genus Venerirupis. 

 Animal. Unknown, but probably resembling the Venus. 

 Shell. Transverse, inequilateral, posterior side short, the 

 anterior gaping 'slightly. Hinge with two teeth on the right 

 valve, three on the left, and sometimes three on both — these are 

 small, near together and parallel. Ligament exterior. Inhabits 

 the British seas, boring into rocks and clay. Eight species. 

 Venerirupis perforans Venerirupis exotica. 



V. nuclea. V. distans. 



V. Ira. V. crenata. 



V. carditoides. V. alata. 



FAMILY VIII. 



Ntmphacea. Ten genera. 



This family is divided into N. Solenaria and N. Tellinaria, 

 from their resemblance to the Solen and Tellina. 



N. Solenaria. Three genera. 

 1. Genus Sanguinolaria. 

 .Animal. Unknown. 



Shell. Oval, compressed, a little elongated, gaping but little, 

 equivalve, subequilateral, rounded at both extremities ; no mark 

 of posterior keel ; summits feebly marked ; hinge formed by one 

 or two contiguous cardinal teeth upon each valve ; ligament pro- 

 jecting ; two round muscular impressions, distant and joined by 

 a narrow palleal impression strongly sinuous behind. Inhabits 

 the sea at Jamaica. Five species. 



Sanguinolaria occidens. Sanguinolaria livida. 



S. rosea. S. rugosa. 



S. alba. 



