84 



sejunctis, et liris concentricis tenuissimis, arcuatis, reflexis, 

 decussatis : umbonibus medianis, tumidts, denudatis, eburneis : 

 cavositas albida ; margine interno crenulato ; cardine debili. 

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



I at first supposed this to be the young of C. Calif or niaiiwn, 

 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. lce- 

 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, cito an- 

 gustato, 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. § poll. Hab. Feejee Islands. 



Allied to C. solenoides, Reeve, which is much more elongated, 

 has purplish rays, and is only tinted purple posteriorly, within. 

 C. coralliophaga, Reeve, is somewhat more elongated, more 

 laminated posteriorly, and radiate striate, and the edge only, 

 tinted rose-red within. 



Arthemis lambata. Testa tenuis, cordato-orbicularis, lenti- 

 cularis, sordide alba, radiatim tenuissime striata et liris concin- 

 nis concentricis, postice laminosis insculpta ; natibus sub-media- 

 nis elevatis, acutis, anteversis ; margine dorsali postico declivi, 

 vix arcuato : lunula profunda, lanceolato-cordata : interior albida ; 

 sinu siphonali obliquo, acuto ; cardine dentibus tribus divergen- 

 tibus in utraque valva. Long. 1; alt. -j^; lat. ^ poll. Hab. 

 Bay of Islands. 



A. lincta is more elevated, has the ridges about twice as large, 

 is destitute of radiating striae, is more solid, and has the ligament 

 margin excavated, and the siphonal sinus is narrower and more 

 acute. 



Venus toreuma. Testa ventricosa, subglobosa, vix obliqua, 

 straminea lituris angulatis rufis picta, concentrice porcata ; liris 

 numerosis ad lateros granulosis, acutis, crenulatis; interstitiis 

 minutissime striatis, et lineolis angulatis pallidis quasi indentatis; 



