CONILITES, 27 
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 an horny operculum and being 
in other respects like Purpura, it should be placed in the family 
of Purpuriferee. Fig. 418, Concholepas Peruviana. 
CONCHI'FERA. Lam. The eleventh class of Invertebrata, 
consisting of all bivalve shells. Lamarck divides this class 
into two orders, viz. C. Dimyaria and C. Monomyaria. The 
former having two adductor muscles; the latter, one. The 
situation of these muscles is marked by impressions in both 
valves. 
CONCHOTRY’A. Gray. (Concha, a shell; Tpvo, tryo, to 
bore.) Order. Pedunculated Cirripedes, Lam. Deser. Five 
pieces, two pairs ventral, one single; shaped like Pentelasmis. 
Found in holes in shells. 
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 ina small point, called the apex, and in- 
creases in width towards the conclusion or base. Itis applied to 
all shells, whether the increase in width from the apex be gradual 
or sudden; or whether in its growth it takes a straight, oblique, 
curved or spirally twisted course. In this sense the bivalves 
would be described as a pair of rapidly enlarging oblique, 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 it is occasionally met with. 
CONIA’. Leach. (From Conus?) 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 ona shelly plate, and closed at the aperture 
by an operculum, consisting of four valves, in pairs. Distin- 
guished from Creusia by its porous structure and by its flat 
support; that of Creusia being cup-shaped. Fig. 21. Conia 
porosa. 
CONICAL. Applied in the ordinary sense, and not as explained 
above under the word Cons. 
CON'ILITES. Auct. Fam. Orthocerata, Lam. and Bl. Deser. 
Conical, straight or slightly curved; having a thin external 
covering, independent of the nut or alveole. Alveole trans- 
versely 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 
