683 



Bather trigonal, with the hinder side not much longer than 

 the front, the concentric ridges slightly undulating, raised and 

 rounded ; the dorsal margin very sloping, flat and lettered ; the 

 ventral margin rounded, slightly bent inwards at the back, and 

 raised towards the front extremity, which is rather pointed. One 

 variety has grey markings, rayed and zigzag; the other is of a 

 pale fawn-colour, in which these markings are very pale or slightly 

 visible. 



Moluccas. 



14. Tapes sinuosa (pi. cxlv. f. 10), Lamarck (Venus), Anim. 

 sans vert. no. 72. 



T. testa subtrigona, subsequilaterali, fulva, rufo pallide radiatim 

 lineata et subpunctata, concentrice costellis numerosis laminatis 

 erectis liratti, postice angulata; margine dorsali declivi, valide ex- 

 cavato ; margine ventrali postice sinuato. 



With the form of T. rhombifera, this species has the riblets 

 raised and laminar, and the ventral margin exhibits a bend similar 

 to that in Tellina. 



Australia. 



15. Tapes pinguis (pi cxlvi. f. 20, 21, 22, 23), C/iem.n. vol. 

 vi. pi. 34. f. 355, 356, 357. Var. Venus nebulosa, Chemn. f. 359, 

 360. Venus opima, Gmel. 



T. testa crassa, ventricosa, laevigata, subovali, brevi ; fulva 

 griseo nebulata, vel alba fulvo nebulata, vel pallide carneo undu- 

 latim picta; umbonibus inagnis; margine dorsali postice declivi, 

 antice subexcavato ; latere postico subtruncato ; latere antice 

 brevi, rotundato ; margine ventrali rotundato. 



A remarkably tumid and thick shell, with large umboes, va- 

 riously painted. 



Ceylon and Tranquebar. 



16. Tapes Ceylonensis (pi. cxlvi. f. 24, 25), Sowerby, jim. 



T. testa ovali, oblonga, crassa, laevigata, vcutricosa, fulva, pal- 

 lide viridi fasciata, .minute fulvo-marinorata, nonnunquam griseo 

 radiata ; margine dorsali livido, antice distincte lunulato ; latere 

 antico brevi ; latere postico subtruncato ; margine ventrali subro- 

 tundato. 



Resembling T. pinguis, but much longer and less ventricose. 

 Ceylon. In Mr. Cuming's cabinet. 



