CARDIACEA. 95 



CAPRINA. D'Orb. Diceras. Auct. ? 



CAPRINUS. Montf. (Conch. Syst. t. 2. p. 143.) The figure 

 appears to be intended to represent Helix Nux-denticulata. 



CAPSA. Brug. Fam. Nymphacea, Lam. — Descr. Equivalve trans- 

 verse, subequilateral, subtrigonal; cardinal teeth, two in one 

 valve, one notched in the other ; lateral teeth remote, obsolete ; 

 an external ligament; two muscular impressions in each valve ; a 

 large sinus in the muscular impression of the mantle. — Obs. 

 This genus is so nearly related to Donax, that it is difficult to 

 distinguish it at first sight. The Capsee, however, have not the 

 short, plain, straight, posterior side, the distinct lateral teeth, 

 nor the crenulated margins which characterize nearly all the 

 Donaces. They are found in the British Channel, Brazil, and 

 coast of Pacific Ocean. They are known from Erycina by not 

 having the pit in the hinge for the ligament. Fig. 109. C. Brazi- 

 liensis. 



CAPULUS. Montf. Fam. Calyptracea, Lam.— Descr. Obliquely 

 conical, posteriorly recurved ; apex pointed, sub-spiral ; aperture 

 large, rounded, oval ; with two muscular impressions, lateral, 

 meeting behind ; epidermis horny, rather velvetty. Britain, 

 Mediterranean, West Indies, California, Australia. 



CARDIACEA. (Cardiacees, Lam.) A family of the order Conchi- 

 fera Dimyaria, Lam. Most of the genera of shells contained in 

 this family are included in the very extensive family of Conchacea, 

 in the system of De Blainville. They are described as having 

 irregularly formed cardinal teeth, generally accompanied by one 

 or two elongated lateral teeth. Most of the species are ventricose, 

 and have regular radiating ribs. This family contains the genera 

 Cardium, Cardita, Cypricardia, Hiatella, Isocardia, and others 

 enumerated in the explanation of figures 122 to 130. Their 

 characters may be thus explained. 



1. Cardium. Two cardinal and two lateral teeth in each 



valve, including Hemicardium, Papyridea and Aphrodita, 

 in the last of which the teeth are nearly obsolete. Fig. 

 122, 123, 123*, 123**. 



2. Venericardia. Twq oblique cardinal teeth, one elou- 



