Zoological Suciety. 47 



albd, striis concentricis elevatis ornatd, interstitiis leet'igatis ; mar- 

 gine vent rail ad utramque extremitatem arcuato, medio convexius- 

 culo ; dorsali postlci alliorc, convexo satisque dtcliminte, antici 

 prope lunulani excavutam, aut horizontali aut leviter acclivi ; latere 

 antico puithdhn longiore, rotunduto ; extrcmilate posticd ohtusd ; 

 natibus ucntis, promincntibus ; flexurd ubsoletd ; dentibus luteru- 

 libiis distinctls, antico approximato, postico parvo, remotiore. 

 Long. 1-SO; lilt. 2- GO poll. 

 Hab. Tumbcz, 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 very 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. 



Tellixa PHiLiPi'iNARUM. Tel. testd ovatd aut subovatd, tenui, 

 subaqvilaterali, intus extusque Candida, nitidd, concentrice et tenu- 

 issime striata ; margine ventruli arcuato, postici' sursiiin 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 Xegros. 

 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 Listeri. Tel. testd obovatd, solidd, ventricosd aut sub- 

 ventricosd, aquilaterali, glabrd, extus intusque candidd ; margine 

 ventrali medio subrecto ; dorsali antice arcuato paululumque de- 

 clivi,po.stice recto, declivi ; latere antico dilatuto, obtuse rotundato ; 

 postico obtusissime biangulato ; liyumento magno, infosso ; natibus 

 obtusis ; umbonibus plerumque suhplunulutis ; cardine dente late- 

 rali antico subapproximato. Long. 2"3 ; lat. 3" poU. 

 Hab. Senegal. AIus. 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 simiUimd, sed an- 

 gusticre ; margifie ventrali medio subrecto ; dorsali utrinque recto 

 aut subconcavo, antice paululian 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 



