62 



CONCHIFEEA. 



Venerupis (Lamk.). Sliell oblong, slightly 



gaping behind, marked with radiating lines, and 



concentric elevated plates ; hinge-teeth small, one 



of them cleft; pallial sinus angular. Bores into 



rocks. 



V. irus. 



Fig. 89 



71. S. 



89 



91 



90 



92 



Tapes (Miihlfeldt). Shell oblong; beaks in 

 front ; margins smooth ; hinge-teeth more or less 

 cleft ; pallial sinus rounded. 



T. aiirea. T. perforans. 



decussata. virginea. 



* pullastra. Fig. 90 ; n. s. 



Lucinopsis (Forbes). Shell compressed; teeth in 

 right valve two, laminar, diverging ; in left three, 

 the middle one cleft ; pallial sinus very deep, as- 

 cending. Animal with a small foot-opening ; foot 

 pointed ; mantle-edges plain ; siphons rather long, 

 separate^ diverging, with fringed orifices. 



L. undata. Fig. 91 ; |- «. s. 



