MOLLUSC A. 67 



oblonga, tenui, cinnamomeo-brunnea. ; striis concentricis ; valva dextra planiuscula, sinistra subven- 

 tricosa.; pallide violaceo radiata; intus violaeea. 



Inhab. San Diego, California. 



This shell is covered with a fine cinnamon-brown epidermis, through which 

 four pale violet rays are visible. One of these traverses nearly the centre of the 

 valve, and the other three are clustered towards the slope on its posterior margin. 

 The right valve is nearly plane, but the other is somewhat ventricose. 



Tellina. Linnaeus. 



277. Tellina fucata, (Plate XXI. fig. 4.) Testa, valde transversa, oblonga, sublineari, 

 laevigata, nitida; latere antico rotundato, postico majusculo, elongato, rotundato, ab umbonibus 

 subprominulo; margine ventrali subrecto, acute ; epidermide olivacea. induta ; ligamento externo. 



Inhab. Bay of Magdalena, California. 



278. Tellina bodegensis, (Plate XXI. fig. 2.) Testa transversa, oblonga, alba, nitida, 

 concentrice striata ; latere antico majusculo, elongato, rotundato, postico nasuto, ad extremitatem 

 truncate, ab umbonibus subprominulo ; liris acutis, versus umbones respectantibus ; ligamento 

 subinterno. 



Inhab. Russian Bodegas. From seven fathoms, on a sandy floor. 



279. Tellina rhodora, (Plate XXI. fig. 3.) Testa transversa, oblonga, valde inaequilaterali, 

 laevigata, polita., versus marginem rosea; latere antico majusculo, elongato, rotundato, postico retuso, 

 obtuse nasuto, ab umbonibus abrupte rotundato ; margine ventrali subrecto, postice paulisper 

 emarginato ; ligamento externo ; intus rosea. 



Inhab. Straits of Macassar. 



The two latter species are regarded as undescribed on the authority of Mr. 

 Sylvanus Hanley, whose researches in this genus have been extensive, and 

 promise to flood us with a multitude of new species. 



Family — Corbulace^e. 

 Corbula. Bruguihres. 



280. Corbula crassa, Hinds, Proceed. Zool. Soc. 1843, p. 55, (Plate XX. fig. 1, 2, 3.) Testa 

 solida, incrassata, elevata, albida, inssquilaterali, latere antico paululum superante, longitudinaliter 

 sulcata, antice rotundata, postice ad extremitatem truncata, ab umbone ad marginem posticam 

 biangulat&; valvarum margine ventrali inclausi, gibbosissima, sinistra? postice denticulata ; umbo- 

 nibus obliquis, posticis ; intus fusca. 



Inhab. Straits of Macassar ; Straits of Malacca; in from seven to thirty 

 fathoms, on a floor of coarse sand or gravel. 



