12 2 coisroPL^A. 



COlSriA. Leacli. Fam. Balanidea, Order, Sessile Cirripicles, 

 Lam. — Descr. Tour ratlier irregular valves, of porous structure, 

 placed side by side, so as to form a circular cone, supported at 

 the base on a shelly plate, and closed at the aperture by an 

 operculum consisting of four valves in pairs. Distinguished 

 from Creusia by its porous structure and by its flat support ; 

 that of Creusia being cup-shaped. Conia porosa. PL i. fig. 21. 



CONICAL. A term applied in the ordinary sense, and not as 

 explained above, under the word Cone. 



CONIDEA. Swainson, A genus separated from Columbella, 

 Lam. thus described, " Mitra shaped, fusiform ; spire equal to or 

 longer than the aperture ; the whorls tumid ; outer lip slightly 

 gibbous above, contracted below; margin not inflected ; striated 

 within ; inner lip terminating in an elevated ridge, but with the 

 teeth obsolete. C. semipunctata, {Columbella, Lam.) Mart. 44. 

 fig. 465, 466." Africa. 



CONILITES. Fam. Orthocerata, Lam. & 'Bl.— Descr. " Conical, 

 straight or slightly curved ; having a thin external covering, 

 independent of the nut or alveole, which it contains. Alveole 

 transversely chambered, sub -separable." (Translated from Lam.) 

 — Obs. The difierence between Belemnites and Conilites is that 

 the external sheath of the latter is thin, and not filled up with 

 solid matter, from the point of the alveole to the apex, as in the 

 former. De BlainviUe places in this genus the genera Thalamiilus, 

 Achelois and Antimomus, Montf. two of which are figured, 

 Knor. Sup. Pab. iv. fig. 1. 1. 8, 9. Conilites Pyramidatus, PL 

 xxii. fig. 470. 



CONILITHES. Swainson. A sub-genus of Coronaxis, Sw. 

 (Coni, with coronated whorls) thus described, " Conic ; spire 

 considerably elevated ; the aperture linear, C. antediluvianus, 

 Sow. Gen. fig. 1." 



CONOHELIX. Swainson, 1843. Imbkicasia, Schum. 1817. 

 {Conus and Helix.) The generic name given to those species of 

 Mitra which are conical in form. C. marmorata, PL xx. 

 fig. 432. 



CONOPL^A. Say. Order, Sessile Cirripedes, Lam. A genus 



