NATURAL SCIENCES OF PHILADELPHIA. 127 



derniide brunea vestita; umbonibus parvis, integris, laevigatis ; intus violacea ; 

 cardine tridentato ; dentibus laterahbus aequalibus. 



Long. 22 ; lat. 19 ; diam. 12 mill. 



Hub. Scamander River. (Collect. Prime.) 



8. Corbicula rhomboidea Prime. C. testa ovato-transversa, subaequi- 

 laterali, tumidula, utraque extremitate obtusa, transversini striata, sulcis 

 profundus et regularibus ; epiderniide fuscescente vestita ; umbonibus tutnidis, 

 erosis ; intus Candida ad margines pallide coerulea ; cardine incrassato, inae- 

 qualiter tridentato ; dentibus lateralibus aequalibus, praelongis, tenuissinie 

 striatis. 



Long. 24 ; lat. 21 ; diam. 14 mill. 



Hab. Malacca. (Collect. Cuming et Prime.) 



Compared to tbe Corbicula brunea Nobis, it is beavier, more inflated, tbe 

 beaks are fuller, both cardinal and lateral teeth are broader and stronger, the 

 color of the interior of the valves is of a lighter shade ; the epidermis is darker 

 and the lines of growth are a little heavier. 



9. Corbicula notata Prime. C. testa ovato-transversa, tumidiuscula, 

 tenui, aequilaterali ; utraque extremitate aequaliter obtusa ; valvis intus viride 

 violaceis ; epidermide viridi vestita ; transversini sulcata ; sulcis distentions ; 

 umbonibus parvis, turgidulis, integris ; cardine angusto; dentibus cardinalibus 

 tribus, inaequalibus, divergentibus ; dentibus lateralibus angustis, arcuatis. 



Long. 18 ;'lat. 14 ; diam. 10 mill. 



Hab. Philippines. (Collect. Cuming, Jay et Prime.) 



Very nearly allied to the Corbicula tumid a Deshayes ; it is, however, 

 lighter of texture, more equilateral, less inflated, the beaks are smaller, the 

 lines of growth are not quite so heavy and more numerous ; the cardinal teeth 

 are more distinct. 



10. Corbicula minor Prime. C. testa ovato-transversa, depressiuscula, 

 tenui, subaequilaterali, extremitatibus rotundata ; umbonibus prominentibus, 

 erosis ;* sulcis regularibus; epidermide virescente vestita; intus violacea; 

 dentibus primariis crassis ; lateralibus subaequalibus. 



Long. 15 ; lat. 11 ; diam. 7 mill. 

 Bab. ? (Collect. Prime.) 



Compared to the Corbicula inaequilaterali Nobis, this species is more 

 equilateral and less elongated. 



11. Corbicula par v ula Prime. C. testa ovato-transversa, depressiuscula, 

 tenui, aequilaterali, extremitatibus rotundata ; umbonibus magnis, tumidis, 

 erosis ; sulcis irregularibus ; epidermide viridi flavescente, irregulariter macu- 

 lata vestita ; intus pallide violacea ; dentibus primariis crassis, lateralibus 

 aequalibus. 



Long. 12 ; lat. 10 ; diam. 5 mill. 

 Hab. India. (Collect. Prime.) 



12. Corbicula s u b r a d i a t a Prime. 

 C'yrena subradiata Kurr., in litt. 



C. testa trigona, aequilaterali, compressiuscula, antice paulo latiore et ob- 

 tusiore, striis regularibus, distantibus, epidermide viridi, nitente induta ; intus 

 pallide violacea ; umbonibus minimis, acutis antice obliquatis, violaceo-sub- 

 radiatis ; cardine angusto, dentibus primariis crassis. 



Long. 14 ; lat. 12 ; diam. 7 mill. 



Hab. India. (Collect. Prime.) 



Very closely allied to the Corbicula radiata Deshayes, from the Nile, it 

 differs in being less inflated, more oval shaped, the beaks are less full and 

 more acute. 



13. Corbicula solidula Prune. C. testa ovato-trigona, crassula, aequi 

 1861.] 



