CORBIS. 121 



2. Ovulum. Lips thickened, inflected, with slight crenula- 



tions ; spire hidden. Fig. 440 to 443. 



3. Erato. Lips thickened, inflected ; spire visible ; a groove 

 down the back. Fig. 454. 



4. Terebellum. Cylindrical, open at the anterior extremity ; 

 columella smooth ; suture of the spire canaliculated. 

 Fig. 451, 452. 



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



rior. Fig. 457, 458. 



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

 with enamel. Fig. 455, 456. 



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

 conical ; columella smooth. Fig 459 to 462. 



CONVOLUTE. (Con, together ; volvo, 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 de- 

 scribing 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. Fig. 440 to 462. 



CORALLIOPHAGA. Bl. Cypricardia Coralliophaga, Lam.— 

 Descr. Oval, elongated, finely striated from the apex to the base, 

 cylindrical, equivalve, very inequilateral ; umbones 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.— Obs. 

 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. Carditoidea, fig. 92. Mediterranean and East Indies. 



CORBICULA. Megerle. Cyrena, Lam. 



CORBIS. Cuv. (A basket.) Fam. Nymphacea, Lam. — Descr. 

 Transverse, oval, thick, ventricose, equivalve, sub-equilateral, free, 



