Zoological Society. 507 



Tellina eburnea. Tel. testd oblongd, opacd, solidd, incequivalvi, 

 convexd, nitidd, albidd, incequilaterali, concentrice sulcatd ; sulcis 

 profundis, remotis (alterd in valvuld, nonnunquam postice evanes- 

 centibus) ; margine ventrali convexiusculo, antice sursum accli- 

 nante ; dorsali antice subrecto, leviterque declivi, postice recto 

 subitbque declivi; latere postico multum breviore, subcuneiformi ; 

 lineis erectis obliquis, aream nymphalem et analem rugantibus ; 

 ligamento brevi> prominente ; flexurd ventrali costdque umbonali 

 subobsoletis ; superflcie interna candidd; dentibus lateralibus, ut 

 in T. punicea. Long. 090 ; lat. 1*50 poll. 



Hab. Tumbez, Peru ; in soft sandy mud, five fathoms. 



Allied to punicea, but easily distinguished from that and any other 

 allied species by the peculiar elevated sulci on the dorsal areas. 



Tellina Prora. Tel. testd subtrigond, ovali, solidd, convexiusculd, 

 subcequilaterali, nitidd, extus intusque pallide rosed, aut sublcevi- 

 gatd, aut concentrice et tenuissime striatd; margine ventrali con- 

 vexo ; dorsali utrinque valde et subcequaliter declivi, subrecto; 

 extremitate posticd acuminatd ; flexurd ventrali costdque umbonali 

 subobsoletis ; ligamento prominulo ; dentibus lateralibus magnis, 

 antico approximato. Long. 1*20 ; lat. 1*80 poll. 

 Hab. Porto St. Elena, West Columbia ; sandy mud, six fathoms ; 

 and Salango, West Columbia, sandy mud, nine fathoms. 



Its extremely delicate concentric striae and acuminated extremity 

 separate it from most of the allied species. It belongs to that group 

 which contains punicea. 



Tellina laceridens. Tel. testd oblong o-subtrigond, solidd, opacd, 

 subcequilaterali, nitidissimd, convexiusculd, albd (intus candidd), 

 superne lavigatd, in/erne concentrice et confertim striatd ; margine 

 ventrali convexiusculo ; dorsali utrinque co?ivexiusculo, et subcequa- 

 liter declivi; extremitate anticd rotundatd (plerumque subattenu- 

 atd), posticd rotundato- acuminatd ; costd umbonali et flexurd ven- 

 trali inconspicuis ; ligamento magno, elongato, prominente ; dentibus 

 primariis laceratis, antico laterali subapproximato, postico lateralis 

 minore, remote Long. 1*50; lat. 2*50 poll. 



Hab. Tumbez, Peru ; soft sandy mud, five fathoms. 



Var. Testd magis trigond, sulcis confertis, undique exaratd. Long. 

 1-20; lat. 1-80 poll. 



Hab. Chiriqui, West Columbia ; sandy mud, three fathoms. 



The ragged primary teeth, the large and elongated ligament, and 

 the either smooth or closely sulcated surface, distinguish it from any 

 of the allied species. 



Tellina princeps. Tel. testd oblong o-ellipticd, cequilaterali, solidd t 

 compressd, nitidiusculd, intus extusque roseo-purpurascente, con- 

 centrice sulcatd; striis exilibus, profundis, radiantibus, sulcos 

 confertos utrinque (et alterd in valvuld undique) decussantibus ; 

 margine ventrali subrecto, dorsali utrinque leviter et cequaliter 

 subdeclivi ; extremitate posticd, obtusissime angulatd ; flexurd ven- 

 trali costdque umbonali obsoletis ; ligamento prominente ; dente 

 laterali antico approximato, postico parvo, remoto, inconspicuo. 

 Long. 2 ; lat. 3'50 poll. 



