62 



CONCHIFERA. 



Venerupis (Lamk.). Shell 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 ; n. s. 



Tapes (Mlihlfeldt). Shell oblong; beaks in 

 front ; margins smooth ; hinge-teeth more or less 

 cleft ; pallial sinus rounded. 



T. aurea. 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 ; \n. s. 



