CORBIS. 125 



columella smooth ; suture of the spire canaliculated. 

 Eig. 451, 452. 



5. Oliva. Columella plaited, swelled into a varix at the 



anterior. Fig. 457, 458. 



6. Akcillaeia. The same, but the suture of the spire covered 



with enamel. Eig. 455, 456. 



7. CoKTJS. Turbinated, numerous whorls ; spire flat or short, 



conical : columella smooth. Fig. 459 to 462. 



CONVOLUTE. (Cow, together; wofoo, to revolve.) This term can 

 be strictly applied only to symmetrical shells, signifying that 

 the volutions are parallel to each other in a horizontal direction, 

 as in the Ammonites, &c. ; but the term is also commonly used 

 in describing such shells as Conus, in which, the direction of 

 the whorls being scarcely oblique, the last whorl almost entirely 

 covers those which precede it. This is the case with Lamarck's 

 family of Enroulees. Eig. 440 to 462. 



COEALLIOPHAGA. Blainville, 1825. Cypetcaedia Coral- 

 liophaga, Lam. — Descr. Oval, elongated, finely striated from the 

 apex to the base, cylindrical, equivalve, very inequilateral ; um- 

 bones slightly raised and quite anterior ; hinge nearly the same 

 in both valves ; two small cardinal teeth, one of which is bifid, 

 placed before a kind of lammellated tooth, beneath a very slender 

 external ligament ; two small, distant, muscular impressions, 

 united by a striated palleal impression, which is strongly striated 

 posteriorly. — 05«. This shell, which is found in the empty holes 

 of dead Lithodomi, in some instances conforming its shape to 

 its situation, differs from Cypricardia of Lamarck, principally in 

 its cylindrical form. C. Carditoidia, PL iv. fig. 92. 



COEBICULA. Megerle, 1811. Part of Cteesta, Lam. 



COEBIS. Cuvier, 1817. (A basket.) Fam. Nymphacea, Lam. — 

 Descr. Transverse, oval, thick, ventricose, equivalve, sub-equila- 

 teral, free, cancellated, with denticulated internal margins; hinge 

 with two cardinal and two lateral teeth in each valve ; of the 

 latter, one near and one remote from the umbones ; muscular im- 

 pressions lunulate, two in each valve, united by an entire palleal 

 impression, without a sinus. — Obs. This genus, of which only 



