CONE. 117 



CONCHIFERA. Lam. The 11th class of Invertebrata, consisting 

 of all those animals which have bivalve shells. Lamarck divides 

 the class into Dimyaria, which have two adductor muscles ; and 

 Monomyaria, which have but one. 



CONCHOLEPAS. Montf. (Concha, a shell ; lepas, a stone or 

 rock.) Fam. Purpurifera, Lam. Entomostomata, BL— Descr. 

 Oval, imbricated, thick ; with a very short spire and large oval 

 patelliform aperture, terminating anteriorly in a slight emargi- 

 nation ; outer lip crenated, with two produced points or teeth 

 towards the anterior , inner lip smooth, nearly flat, reflected over 

 the last whorl, so as nearly or entirely to cover it ; operculum 

 horny. Marine, only one species known, from Peru. — Obs. This 

 shell is placed near Patella by Lamarck, on account of its large 

 open aperture ; but having a horny operculum, and resembling 

 Purpurea in other respects. Fig. 418. Concholepas Peruviana. 



CONCHOTRYA. Gray. (Concha, a shell ; Tpvo, (tryo) to bore.) 

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

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

 holes. 



CONCHYLIOMORPHITE. A term used by Be Blainville to desig- 

 nate the cast or model of a fossil shell, formed by a siliceous sub- 

 stance 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 ex- 

 ternal or internal characters to be conjectured from the monu- 

 mental impressions that remain. 



CONCHYTA Hupsch Mus. Calceola, Lam. 



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



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 in- 

 creases in width towards the conclusion or base. It is applied to 

 all shells, whether the increase in width be gradual or sudden ; 

 or whether in its growth, its takes a straight, oblique, curved, or 

 spirally-twisted course In this sense, a bivalve would be de- 



