132 CRYPTODIBEANCnTATA. 



CEIOCEEATITES. A genus composed of species of Am- 

 monites, with disconnected whorls. C. Duvallii. PL xxiii. fig. 

 482. 

 CEIOPUS. Poli. Ceakia, Auct. 



CEISTACEA. Lam. The third family of Polythalamous Cepha- 

 . lopoda, Lam. This family is described as including shells of the 

 following characters : " MultUocular, flattened, nearly reniform ; 

 the chambers gradually increasing in length, as they approach 

 the outer arched margin, and appearing to revolve round an 

 eccentric, more or less marginal axis. The Cristacea contain the 

 genera Eenulina, Cristellaria, and Orbiculina." 

 CEISTACEA. Bl. The third family of 'Polythalamia, Bl. con- 

 taining the genera Crepidulina, (CristeUaria, Lam.) Oreas and 

 Linthuris. 

 CEISTAEIA. Schum, 1817. Dipsas Plicatus, Leach. Anodon 



tubercidatus, Eer. 

 CEISTELLAEIA. Lam. Ceepidulika, Bl. Fam. Cristacea, 

 Lam. and Bl. — Bescr. Semidiscoidal, chambered; whorls con- 

 tiguous, enlarging progressively ; spire eccentric, sublateral ; 

 septa imperforate. Microscopic. 

 CEUCIBULUM. Schum. 1817. The " cup and saucer" division 



of Calyptrsese. 

 CEYPTA. Humph. See Crepidtjla, Lam. 

 CEYPTELLA. Webb, 1833. (KpuTrrw, to conceal.) Testacel- 

 liUS Ambiguus of Eerrusac. Published in Sowerby's Grenera of 

 Shells as Paemacella calyculata. — Bescr. A small patelliform 

 shell, Avith a very short papillary spire ; and the aperture irre- 

 gularly expanded. Canary Islands. PI. xiii. fig, 256. 

 CEYPTO CHITON. Gray, 1847. Chiton Amiculatus. The 



valves of which are entirely covered. 

 CEYPTOCONCHUS. Bl. A genus composed of species of 

 Chiton, the valves of which are covered by the integument, as 

 Chiton porosus of Burrows. Ch. amiculatus of Pallas. 

 CEYPTOCONCTUS. Bl. Chiton porosus, the valves of which 



are covered, with the exception of a narrow dorsal ridge. 

 CEYPTODIBEANCHIATA. Bl. The first order of the class 



