27 



Greatly resembles M, costata Say. It lias a more purplish hue, a 

 more shining epidermis ; but the principal difference is in the pos- 

 terior acumination, and the gentle sweep as well as inclination for- 

 wards of the internal rib. 



SoLEMYA PUsiLLA. T. fragilis, oblongo ovalis, vix retrorsum 

 dilatata, epidermide tenui pallida sub lente striis confertis radiantibus 

 insculptii, et radiis fuscis remotis picta ; extremitatibus rotundatis ; 

 margine dorsali recta ; margine ventrali leniter arcuata ; umbonibus 

 ad quadrantem anteriorem positis. Long. 12; alt. 5 millim. Inhabits 

 Hakodadi Bay in 5 fathoms, muddy bottom. TV. S. 



Described from a single, perhaps immature specimen. It is near to 

 S. velum Say, though the dorsal margin appears more straight; and 

 if the radiating striae are constant, it would be a good distinctive 

 character. 



PsAMMOBiA SPATULATA. T. tenuis, compressa, oblongo-ovata 

 retrorsum angustata et ad extremitatem truncata, antice rotundata; 

 margine dorsali recta ; marg. ventrali arcuata ; umbonibus ad trientem 

 posteriorem locatis, minutis ; callo ligamentali elevato, intus suffulto ; 

 disco striis concentricis exilibus et striis radiantibus tenuioribus in- 

 sculpto : color rufescens, lineis saturatioribus radiata, intus hepatica : 

 cardo debilissimus. Long. 28; alt. 15 ; lat. 4 millim. Taken off the 

 coast of China, 23° 30' N. in sand, 25 fathoms. W. S. 



PsAMMOBiA TENELLA. T. tenuis, fragilis, alba, pellucida, glabra, 

 elongato-elliptica, vel potius postice angustior et sub truncata ; um- 

 bonibus vix postmedianis, acutis ; margine dorsali postica cristata, 

 juxta umbonibus emarginata ; declivitate umbonali conspicuo ; ex- 

 tremitate antica rotundatii ; marjrine ventrali lente arcuata. Lonw. 

 1 2 ; alt. 6 ; lat. 3 millim. Inhabits Hong Kong Harbor, in 8 fathoms. 

 W. S. 



Semele duplicata. T. ovato-reniformis, tenuis, compressa, 

 straminea, laminis erectis plerumque geminatis erectis prope apicem 

 desideratis ornata ; umbonibus postmedianis, elevatis ; margine dorsali 

 antica incurvata ; marg. postica sensim arcuatfi ; portione postica 

 altiori, acutiori ; plica submarginali obsoleta : cardo debilis ; dentibus 

 lateralibus approximatis. Long. 20 ; alt. 16 ; lat. 6 millim. Inhabits 

 Kagosima Bay, in 6 fathoms, sandy bottom. W. S. 



Almost identical in form with Tellina lyra, which has a smooth fold 

 and more remote ridges. S. scabra Hanley, is similar, but has radia- 

 ting lines between the ridges. It probably groAvs larger. 



Semele alveata. T. subcircularis admodum convexa, fere 

 equilateralis, flavida, concentrice laminato-striata ; interspatiis radia- 

 tim clathratis, radiis laminas baud equitantibus ; plica submarginali 

 conspicua ; margine dorsali excavata ; extremitate postica subtrun- 



