63 



et (Bqualiter declivi ; extremitate posticd obtusd, attenuatd ; liga- 

 mento angustissimo, infosso ; natibus obtusis ; 'flexurd distinctd ; 

 costd umbonali inconspicud ; dentibus lateralibus distinctis, mitico 

 paululUm propinquiore. Long. 0'50; lat. 0-75 poli. 



Hab. St. Nicholas, Zebu ; sandy mud, four fathoms. 



More oval than the three succeeding closely allied species. 



Tellina pinguis. Tel. testdparvd, rotundato-ovali, tenui, subinaąui- 

 valvi, subcequilaterali, nitidd, convexd aut subventricosd, intus ex- 

 tusgue ulbidd {rariiis incarnatd), leevigatd (nonnunguam concentrice 

 substriatd) ; margine ventrali arcuato, dorsali utrinque convexo 

 et sub<eqmliter declivi ; extremitate posticd obtusd ; flexurd di- 

 stinctd; natibus minimis ; costd umbonali f ere obsoletd ; ligamento 

 angustissimo, infosso; dentibus ut in T. nuce. Long. 050; 

 lat. 0-60 poli. 

 Hab. St. Nicholas, Zebu. 



By its more orbicular outline it may be distinguished from nux 

 and casta. It is still more closely allied to robusta, but its tenuity, 

 more obtuse hinder extremity. and the greater convexity and less 

 sudden slope of the dorsal edges, suffice for its separation. 



Tellina robusta. Tel. testd parvd, rotundato-subtrigond, solidd, 

 subin(equivalvi, subaquilaterali, ventricosd, nitidd, aut albo-flaves- 

 cente, aut pallide rosaced, sublcevigatd (plerumgue inferius remote 

 substriatd) ; margine ventrali valde arcuato, dorsali utringue sub- 

 recto et valde declivi; latere postico attenuato, fere subrostrato, 

 ad extremitatem acuminato ; ligamento angustissimo, infosso ; na- 

 tibus distinctis, prominentibus, et recte incitrvatis ; umbonibus 

 tumidis ; flexurd distinctd ; costd umbonali fere obsoletd ; lunuld 

 parvd ; superficie internd, plerumgue sub umbonibus, flavidd aut 

 rosed ; dentibus ut in T. nuce. Long. 0-70 ; lat. 0-80 poli. 

 Hab. Isle of Annaa, South Seas, and isle of Buriąs, Philippines ; 

 sandy mud, low -vrater. 



Is closely allied to nux, pinguis and casta, but of a stouter tex- 

 ture even in the youngest iudividuals. The Hgamental edge being 

 nearly straight, easily separates it from pinguis, \vhere it is decidedly 

 convex. 



Tellina casta. Tel. testd obovali, tenuissimd, subineeguivalvi, 

 suba:quilaterali, pellucidd, convexd, nitidd, extus intusgue candidd, 

 lavigatd ; margine ventrali maxime arcuato ; dorsali utrinque sub- 

 recto, subagualiter satisque declivi ; extremitate posticd angustd. 

 biangulatd; ligamento angustissimo, subinfosso ; natibus ucutis ; 

 flexurd ventrali costdque umbonali distinctis ; dentibus ut in T. 

 nuce. Long. O' 36 ; lat. 0-48 poli. 

 Hab. Singapore ; sandy mud. 



Bears some resemblance to T. nux, but the shape is less broad, 

 the ventral edge decidedly arcuated, the dorsal edges less convex and 

 shorter, and the umbones colourless. 



Tellina Discus. Tel. testd T. Remiei simillimd, sed subobliqud et 

 suleis concentricis valde irregularibus, vixque continuis ; natibus 



