COKFLITENT. 121 



on account of its large open aperture ; but having a horny 

 operculum, and resembling Purpurea in other respects. Concho- 

 lepas Peruviana. PL xix. fig. 418. 



CONCHOTETA. Gray. (Concha, a sheU -, Tpvo, {tnjo) to hove.) 

 Order, Pedunculated Cirripedes, Lam. — Descr. Pive pieces, two 

 pairs ventral, one single ; shaped like Pentelasmis. Pound in 

 holes. 



CONCHTLIOMOEPHITE. A term used by De Blainville to 

 designate the cast or model of a fossil shell, formed by a 

 siliceous substance which has entered or surrounded it when in 

 a liquid state, and subsequently become hardened into flint. The 

 shell has afterwards decomposed or fallen off by accident, 

 leaving its external or internal characters to be conjectured 

 from the monumental impressions that remain. 



CONE. A common name for shells of the genus Conns. 



CONE. This mathematical term is used by conchologists in its 

 utmost latitude of signification to express a body, which in its 

 formation, commences in a small point, called the apex, and 

 increases in width towards the base. It is applied to all shells, 

 whether the increase in width be gradual or sudden ; or whether 

 in its growth it takes a straight, oblique, curved, or spirally- 

 twisted course. In this sense, a bivalve would be described as 

 a pair of rapidly enlarging, obHque cones, and the aperture of 

 every spiral shell would be its base. But this phraseology being 

 in disuse, it is only mentioned here that it may be understood 

 when occasionally met with. 



CONELLA. Swainson. A genus composed of species of the 

 genus Columbella, Lam. which have a conical form, and which, 

 on that account, are considered by Swainson as belonging to his 

 family of Coninae. Swains. Lardner, Cyclop. Malac. described 

 at p. 312. C. picata, Sw. fig. 17. a. p. 151. 



CONPLUENT. A term applied to two parts of a shell when 

 they gradually flow into each other, as, for instance, the inner 

 an,d outer lips of Univalves when they pass into each other at 

 the anterior extremity, without the intervention of a notch or 

 angle. 



