717 



and the irregular concentric rugae 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 laevigato, litera- 

 te ; 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 rugae con- 

 tinued in the middle of the shell. 



Indian seas. 



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

 theraea), Anim. sans vert. no. 73. Var. Cytheraea lunulata, La- 

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



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

 alba, griseo inaculata 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, laevigato, nonnunquam literato ; 

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

 latis, elevatis ; margine interno crenulato ; dente cardinali antico 

 magno. 



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), Sower by, jun. 



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

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

 nato ; lunula et area dorsali lividis, laevigatis. 



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

 smooth, with rather round, concentric ribs. 



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



