708 



diata et maculata, intus rosea, costellis radiantibus antice dupli- 

 catis et laminis erectis, antice reilexis, supenie crenulatis, subtus 

 laqueatis, postice lobatis decussata ; latere postico sublobato, sub- 

 rostrato, margine dorsali declivi, planulatim excavato ; latere aii- 

 tico breviusculo, margine rotundatim elevato ; lunula radiatim 

 striata, fusca. 



One of the most beautiful species in the group, distinguished 

 by its elegantly sculptured concentric laminae, with duplicate ra- 

 diating ribs, and by the beautiful rose-colour of the interior. 



Singapore. Cliina. 



14. Venus nodulosa (pi. cliii. f. 16), Sowerhy, jun. 



V. testa ovali-subtrigona, alba, fusco obscure triradiata et ma- 

 culata, intus rosea, costellis radiautibus antice duphcatis et lami- 

 nis erectis antice valide reflexis superne costellatis subtus noduli- 

 feris postice lobatis et expansis decussata; latere postico elon- 

 gate, subrostrato ; margine dorsali declivi, planulatim excavato ; 

 latere antico breviusculo, margine rotundatim elevato ; lunula de- 

 press; 7 !, radiatim striata, fusca. 



The shell is rather longer and flatter than V. Lamarckii, and 

 the concentric laminae are coiled round and thickened so as to 

 present their under surface in round nodules. It may be only a 

 very remarkable variety. I am acquainted with several specimens, 

 one of which is in Mrs. Colonel Cathcart's collection, and another 

 in that of Mr. Taylor. 



Locality unknown. 



15. Venus oknatissima (pi. cliii. f. 24), Broderip, Pro. 

 Zool. Soc. 1835, p. 44. 



" V. testa subglobosa, radiatim creberrime costata, lamellis con- 

 centricis, valde elevatis, crispo-plicatis, spadicco-albente, intus 

 alba, limbo interno crenulato." 



More rounded than V. Lamarckii, with the laminae broad, dis- 

 tant, and beautifully fringed in the front as well as the back part 

 of the shell, and the radiating ribs duplicate from the middle to 

 the border ; colour brownish- white. 



Panama ; in sandy mud. Cuming. 



16. Venus simillima (pi. cliii. f. 17, 18), Sowerhy, jun. 



V. testa ovali, crassa, sordide alba, costellis duplicatis radiata, 

 laminis concentricis laminatis numerosis antice reilexis crenulatis 



