CARDTACEA. 97 



raised; tlie margin of tlie body-wliorl flattened, and serrated 

 with flat spines ; inner lip united to the outer ; pillar and aper- 

 ture as in the last. (Tubicanthus) C. imperialis. Mart, 173. 

 f. 1714," This sub-genus appears to include those species of 

 which De Montfort's genera Imperator and Calcar are formed. 



CAPITULUM. Klein. Pollicipes Mitellus, Lam. PL ii. fig. 

 37*. 



CAPEELLA. Gruilding, 1825. Plekocheiltjs. Also of Guild- 

 ing, AuEiCTTLA Caprella, Lam. PI. xxv. fig. 522, 523. 



CAPEINA. D'Orb. Diceeas. Auct. ? 



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

 appears to be intended to represent Helix Nux-denticulata. 



CAPS A. Lamarck. Fam. Nymphacea, Lam. — Bescr. Equivalve, 

 transverse, subequilateral, subtrigonal ; cardinal teeth, two in 

 one valve, a notched one in the other ; lateral teeth remote, obso- 

 lete ; 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 difii- 

 CLilt to distinguish it at first sight. The Capsse, 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. C. Brazilien- 

 sis. PI. V. fig. 109. 



CAPULUS. Montf. 1810. Fam. Calyptracea, Lam.~De*cr. 

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

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

 lateral, meeting behind ; epidermis horny, rather velvety. 

 Britain, Mediterranean, "West Indies, California, Australia. Ex. 

 C. ungaricus. PI. xii. fig. 240. 



CAEDIACEA. (Cardiacees, Lam.) A family of the order Con- 

 chifera Dimyaria, Lam, Most of the genera of shells contained 

 in this family are included in the very extensive family of Con- 

 chacea, in the system of De Blainville. They are described as 

 having irregularly formed cardinal teeth. Most of the species 



H 



