719 



47. Venus marioa (pi. clvii. f. lO'il-\lO),Linuaus, 12th edit, 

 p. 1130. C/te)mi. Conch, f. 282-3-4. 



V. testa ovato-subtrigona, alba, vel maculis fuscis angulosis sub- 

 trigonis radiatim picta, concentrice et radiatim costellata ; costellis 

 concentricis noduliferis, ad latns posticum alternatim in laminis 

 acutis fiinbriatis productis ; area dorsali magna, striata, scabra, sub- 

 elevata ; latere antico breviusculo ; lunula scabra, tumida, magna. 



Of a rather trigonal form, with the radiating ribs so strongly 

 decussating the concentric, obtuse laminae, as to cut them into 

 nodules ; at the back of tlie shell some of these concentric ribs 

 are discontinued, and others of them raised into sharp, produced, 

 fi'inged laminae ; behind these laminse is a scabrous area, elevated 

 towards the dorsal margin. The lunule is large and scabrous. 

 The colour is arranged in rows of large angular spots. The 

 species is subject to great variation, particularl}' as to the degree 

 in which the concentric and radiating ribs modify each other in 

 crossing. 



Pliilippines. Gimiing. 



48. Venus australis (pi. clvii. f. Ill, 112), Sowerhj, Pro. 

 Zool. Soc. 1835, p. 22. 



"V. testa ovato-subtrigona, crassiuscula, fulvescente, maculis 

 angulosis subtrigonis subradiatim picta, concentrice lamellosa ; 

 lamellis concinnis, confertis, tenmbus, obtusis, pulcherrime radia- 

 tim decussatis, prope latera elevatioribus ; marginibus dorsali sub- 

 elevato, ventrali rotundato, iutus denticulato ; " lunula parva, 

 fusca, striata. 



Of an oval, approacliing to trigonal form, with numerous, close, 

 laminar, concentric ribs, finally crenulated by the radiating strise, 

 and more produced at the posterior side. The front side is the 

 shorter, and has a small chestnut-coloured lunule. The colouring 

 is very beautiful, being arranged in several rays of large angular 

 brown spots. Var. f. ill is coarser than the other, but not nearly 

 so coarse as V. marica. 



49. Venus spurca (pi. clvi. f. 92-98), Sowerhy, Pro. Zool. 

 Soc. 1835, p. 23. V. crassa, denticulata, mesodesma, violacea, 

 Qiuoy, Astr. t. 84. f. 7, 8, 15, 16, 17, 18, 19, 20. Test, jun.? V. 

 cselata, Menke, Phihppi, Fenus, t. 5. f. 3. V. spissa. Wood's Suppl. 



" V. testa ovata, crassa, sordide fulva, fusco radiatim maculosa, 

 concentrice subobsolete costellata; costellis obtusis, prope latera 

 subinterruptis ; margine ventrali intus denticulato." 



