CONIA. Leach. _Fam._ Balanidea. _Order_, Sessile Cirripedes, Lam.--_Descr._ Four rather 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. Fig. 21, Conia porosa. CONICAL. A term applied in the ordinary sense, and not as explained above, under the word CONE. CONIDEA. Sw. A genus separated from Columbella, Lam. thus described, "Mitra shaped, fusiform; spire equal 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 difference 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 Blainville places in this genus the genera Thalamulus, Achelois and Antimomus, Montf. two of which are figured, Knor. Sup. Fab. iv. fig. 1. 1. 8. 9. Conilites Pyramidatus, fig. 470. CONILITHES. Sw. A sub-genus of Coronaxis, Sw. (Coni, with coronated whorls) thus described, "Conic; spire considerably elevated; the aperture linear, C. antediluvianus, Sow. Gen. f. 1." CONOHELIX. Sw. (_Conus and Helix._) The generic name given to those species of Mitra which are conical in form. Fig. 432, C. marmorata. CONOPLÆA. Say. _Order_, Sessile Cirripedes, Lam. A genus composed of Balani, attached to the stems of Gorgonia, having their bases elongated. _Ex._ fig. 27, Balanus Galeatus. CONORBIS. Sw. A genus composed of species of CONUS, such as C. dormitor, (Sowerby, gen. fig. 8) which have elevated spires and the upper part of the outer lip deeply sinuated. Mr. Swainson considers these fossil species as analogous to the Pleurotomæ. _Sw._ Lard. Cyclop. Malac. p. 312. CONOVULUM. A genus proposed by Lamarck, to include the small, conical species of Auricula, which have the outer lip simple. This genus was afterwards abandoned by the author. _Ex._ fig. 298, Auricula coniformis.