Zoological Society. 47 



albd, striis concentricis elevatis ornatd, interstitiis Icevigatis ; mar- 

 gine ventrali ad utramque extremitatem arcuato, medio convexius- 

 culo ; dorsali postice altiore, convexo satisque declinante, antice 

 prope lunulam excavatam, aut horizontali aut leviter acclivi ; latere 

 antico paululum longiore, rotundato ; extrcmitate posticd obtusd ; 

 natibus acutis, j^rominentibus ; flexurd obsoletd ; dentibus latera- 

 libus distinctis, antico approximato, postico parvo, remotiore. 

 Long. 1-80; lat. 2*60 poll. 

 Hab. Tumbez, Peru. 



This most exquisite shell will probably prove inequivalve, but as I 

 have never met with any but left valves, I can only judge so from 

 analogy. Although veiy different in shape, its texture and the ex- 

 cavated dorsal areas remind us of Burnetii. The ventral fold is obso- 

 lete, and the situation of the umbonal ridge is indicated by a linear 

 carina, which is only separated from the dorsal edge by a narrow 

 concavity. 



Tellina philippinarum. Tel. testd ovatd aut subovatd, tenui, 

 subcequilaterali, intus extusque candidd, nitidd, concentrice et tenu- 

 issime striatd ; margine ventrali arcuato, postice sursiXm acclivi ; 

 dorsali antico brevi, recto, subdeclivi ; latere postico subcunei- 

 formi ; ligamento prominulo ; extremitate anticd obtusd ; cardine 

 dente laterali {in junioribus subobsoleto) antico subapproximato. 

 Long. 0-70; lat. 1 poll. 

 Hab. St. Nicholas, isle of Zebu, and Jimmamailan, isle of Negros. 

 This shell, which appears to be common throughout the Philippine 

 Islands, reminds us by its shape of the T. solidula. It is rather vari- 

 able in its proportions, and but rarely attains the assigned dimen- 

 sions. In aged specimens the vicinity of the umbones is usually of 

 a flesh- colour or tawny orange. 



Tellina Ltsteri. Tel. testd obovatd, solidd, ventricosd aut sub- 

 ventricosd, eequilaterali, glabrd, extus intusque candidd ; margine 

 ventrali medio subrecto ; dorsali antice arcuato pauluBmque de- 

 clivi, postice recto, declivi ; latere antico dilatato, obtuse rotundato ; 

 postico obtusissime biangulato ; ligamento magno, infosso ; natibus 

 obtusis ; umbonibus plerumque subplanulatis ; cardine dente late- 

 rali antico subapproximato. Long. 2"3 ; lat. 3* poll. 

 Hab. Senegal. Mus. Cuming, Hanley. 



This species appears to be represented in Lister's * Historia Con- 

 chyliorum,' plate 288. fig. 235. Although in general shape it is 

 approached by many of its section (Tellina with a single lateral tooth), 

 its superior size and solidity render it remarkable. 



Tellina pumila. Tel. testd T. philippinarum simillimd, sed an- 

 gustiore ; margine ventrali medio subrecto ; dorsali utrinque recto 

 aut subconcavo, antice paululiim declivi, latere postico cuneiformi ; 

 margine antico recto, verticali. Long. 0*60; lat. 0*90 poll. 



Hab. Valparaiso ; sandy mud, from seven to thirty fathoms. 



Easily to be confused with T. philippinarum, but is decidedly nar- 

 rower and the margins less convex. The front dorsal edge, which 



