128 



CUCULL.EA. 



CRISTACEA. EL The third family of Polythalamia, Bl. con- 

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

 Linthuris. 



CRISTARIA. Schum. Dipsas Plicatus, Leach. Anodon tuber- 

 culatus, Fer. 



CRISTELLARIA. Lam. Crepidulina, Bl. Fam. Cristacea, 

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

 tiguous, enlarging progressively ; spire eccentric, sublateral ; 

 septa imperforate. Microscopic. 



CRYPTA. Humph. Crepidula, Lam. 



CRYPTELLA. Webb. (Kpu7rrio, to conceal.) Testacellus Am- 

 biguus of Ferrusac. Published in Sowerby's Genera of Shells as 

 Parmacella calyculata. — Descr. A small patelliform shell, with 

 a very short papillary spire ; and the aperture irregularly ex- 

 panded. Fig. 256. Canary Islands. 



CRYPTOCONCHUS. 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. 



CRYPTODIBRANCHIATA. Bl. The first order of the class Ce- 

 phalophora, Bl. containing families of molluscous animals des- 

 titute of shells. 



CRYPTOSTOMA. BL Differs from Sigaretus, Lam. principally 

 in the soft parts of the animal. De Blainville remarks that he is 

 acquainted with only two species (from the Indies), which he 

 can with decision refer to the genus, but he thinks that many of 

 the Lamarckian Sigareti may very probably be found to belong 

 to it, as soon as the soft parts shall be known. The species which 

 he figures is Cryptostoma Leachii. (Manuel de Malacologie, pi. 42. 

 fig. 3.) 

 CTENOCONCHA. Gray. Described as having many characters in 

 common with the Solens, the teeth like Nucula, but the cartilage 

 entirely external. Soleneli.a, Sow. ? 



CUCULLiEA. Lam. ( Cucullus, a hood.) Fam. Arcacea, Lam 



Descr. Sub- quadrate, nearly equi valve, sub -equilateral, deep ; 

 hinge rectilinear, with a series of angular teeth, small near the 

 umbones, larger and more oblique towards the extremities ; um- 



