90 



approximato. Long. 2| ; alt. 2^ ; lat. 1^ poll. San Diego, 

 Lieut. Green. 



Usually found about half the above size ; the concentric 

 lamellsB become worn off and more irregular towards the margin. 

 The interior is faintly tinted yellow when young, but very richly 

 so when old. It is near A. corrugatum, Sowb. 



DoNAx oBESus. T. parva, solida, ovato-cuneata, ventricosa, 

 nitida, radiatim leviter striata, coloribus albidis et fulvidis omnino 

 vel radiatim picta et plerumque zonis violaceis ornata ; angulo 

 postero-dorsali rectangulari ; facie posteriori cordiformi, sub- 

 triangulari ; latere antico angustato, cito rotundato ; margine 

 ventrali denticulato, postice coarctato : intus alba, vel flaves- 

 cens, violaceo nubeculata, ad marginem dorsalem fuscata. Long, 

 ■j?^ ; alt. y^^ ; lat. -^^ poll.. San Diego. Lieut. Green. 



In general appearance, especially as to striation and posterior 

 area, it is much like D. anatinum; but the angle at the apex is 

 more nearly a right angle, the anterior margin is less acutely 

 rounded, the strise are none of them punctate ; some of the small 

 specimens are very tumid. The coloration is quite various. 



Tellina miniata. T. transversa, ovata, tenuis, compressa, 

 valde hians, concentrice striata, erubescens ; apicibus ante-medi- 

 anis ; latere antico semiovali ; latere postico ovato-triangulari ; 

 margine ventrali sub-pendulo : intus miniata : cardo dentibus 

 duobus divergentibus utraque valva instructus ; nymphis conspi- 

 cuis. Long. 2 ; lat. f; alt. 1|- poll. Inhabits San Juan. Lieut. 

 Green. 



Compared with the analogous West India species, T. rosea., it 

 is longer, more delicate, less convex, more inequilateral, more 

 acuminated posteriorly, the ventral and posterior margin less 

 arcuate : color much more roseate externally, and intensely red 

 internally ; hinge in that species with but a single tooth and the 

 vestige of one at its side. 



LuciNA ORBELLA. T. parva, subglobosa, tenuicula, albida, 

 concentrice inequaliter striata ; apicibus medianis, baud eminent- 

 ibus, absque lunula antica ; lateribus fere symmetricis ; intus 

 alba. Cardo valvae dextrse dentibus duobus quorum antico 

 minore — valvae sinistrse dentibus duobus quorum antico bifido, 



