717 



and the irregular concentric rugse are finely crenulated as they 

 pass over the striae. In the preceding species the lunule is 

 striated^ in this it is quite smooth. While all the other species 

 of this group have the inner margin crenulated, in this it is per- 

 fectly smooth, — an instance showing the extreme difficulty of 

 arranging shells in defined groups. 

 The radiated variety is from China. 



40. Venus punctifera (pi. clvi. f. 87), Gray, Brit. Mus. 



V. testa elongato-subtrigona, crassa, grisea, radiatim striata, 

 concentrice rugifera; latere postico angulato, producto, rostrato, 

 ad angulum nodulosim carinato ; margine dorsali Isevigato, litera- 

 to ; latere antico brevi, subacuminato ; lunula laevigata, literata. 



More acuminated and lengthened than V. macrodon, with a cre- 

 nulated keel at the posterior angle, and the concentric rugse con- 

 tinued in the middle of the shell. 



Indian seas. 



41. Venus macrodon (pi. clvi. f. 88, 89, 90), Lamarck (Cy- 

 thersea), Anim. sans vert. no. 73. Var. Cythersea lunuJata, La- 

 marck, Pliilippi (Venus), t. 3. f. 10. 



V. testa subtrigona, crassa, ventricosa, flavido-grisescente vel 

 alba, griseo maculata et Hterata, vel fusca, ad latera et prope um- 

 bones radiatim obscure striata, concentrice rugifera, medio plana ; 

 latere postico angulato, producto, rostrato, ad angulum monili- 

 fero; margine dorsali declivi, Isevigato, nonnunquam literate; 

 latere antico rotundato; lunula impressa, laevi; umbonibus angu- 

 latis, elevatis ; margine interno crenulato ; dente cardinali antico 

 niagno. 



Shaped like the preceding, but with the umboes more elevated 

 and angular, and the greater part of the central surface smooth ; a 

 posterior angle is beaded at the upper part. The grizzled variety 

 is lettered on the dorsal margin and lunule. 



Brazil. 



42. Venus rostrata (pi. clvi. f. 91), Sowerby , jun. 



V. testa parva, Isevi, grisescente, subtrigona, concentrice lirata ; 

 latere postico producto, rostrato; latere antico brevi, subacumi- 

 nato ; lunula et area dorsali lividis, Isevigatis. 



A beautiful little shell, similarly formed to the preceding, but 

 smooth, with rather round, concentric ribs. 



Locality unknown. Specimens in Mr. Hauley's collection. 



