276 



Cardita ventricosa. Testa solida, ventricosa, ovato-trigona 

 vix obliqua, radiatim 18-20 costata, costis concentrice subno- 

 dosis, interstitiis angustis, epidermide fuliginoso, villoso induta ; 

 umbonibus submedianis, obtusis ; intus alba ; margine profunde 

 crenulato ; dente cardinal! valvae dextrse, elevato, crasso, trian- 

 gulari. Lat. f ; alt. f ; lat. ^ poll. Hah. Puget Sound. 



Compared with C. borealis, Conr., it is thicker, less transverse, 

 more tumid at the beaks, which are less recurved ; the ribs are 

 barred ; the cardinal tooth is short, triangular (not long falcate) 

 and detached from the margin ; the crenulations of the margin 

 deeper. 



Cardita procera. Testa elevata, ovato-triangularis, radiatim 

 ad 15-sulcata, (interstitiis convexiusculis) concentrice striata, 

 epidermide fulvo induta ; apice mediano, acuto, obliquo ; cardo 

 dente unico triangulari obliquo, instructus ; margine interne sul- 

 cato. Long, f; alt. f; lat. -i poll. Hah. Rio Negro, Pata- 

 gonia. 



It has a more compressed and less oblique form than C. ho- 

 realis, and fewer ribs. The right valve only was obtained. 



CardiujM blandum. Testa parva, tenuis, subcircularis, vix 

 transversa, ventricosa, postice subtruncata, cinereo-rufescens, 

 costis planulatis radiantibus ad 40 insculpta, sulco angusto 

 sejunctis, et liris concentricis tenuissimis, arcuatis, reflexis, 

 decussatis : umbonibus medianis, tumidis, denudatis, eburneis : 

 cavositas albida ; margine interne crenulato ; cardine debili. 

 Long. 1 ; alt. | ; lat. f poll. Hab. Puget Sound. 



I at first supposed this to be the young of C. Californianum, 

 Conr., but find that there are about ten more ribs, and the sculp- 

 ture is quite different. It seems to be the analogue of C. Ice- 

 landicum, which has acute ribs and a peculiar fringed epidermis. 

 Its form varies from circular to transversely oval. 



Cypricardia rosea. Testa transversa, oblonga, tenuis, antice 

 radiatim tenui-striata, postice concentrice squamoso-striata : um- 

 bonibus valde anticalibus, acutis ; latere antico brevi, rapide 

 angustato, ad apicem truncato, albido ; latere postico oblongo, ad 

 apicem truncato, rosaceo; margine dorsali vix arcuato ; margine 

 ventrali recto : intus rosacea ; cardo debilis, dentibus fere longitu- 

 dinalibus. Long. If ; alt. f ; lat. f poll. Hab. Feejee Islands. 



