CHAMA. 21 
CELLAN’THUS. Montf. Vorricraris, Bl. A genus of micro- 
scopic Foraminifera. 
CELLULAC’EA. Bl. Second order of Cephalophora, Bl. con- 
sisting of doubtful microscopic bodies, with a number of variously 
arranged cells, as distinguished from the true Polythalamia, Bl. 
or chambered shells. 
CEMO'RIA Flemingii. Leach. A small patelliform shell, dif- 
fering from Fissurella, in having the fissure placed behind the 
apex, which is produced, pointed and incurved. Itis the Patella 
Fissurella, Mill. Patella Noachina, Chemn. F. Noachina, 
Sow. Puncturella, Lowe. Fig. 244, Cemoria Flemingii. 
CEPHALOP’HORA. Bl. First class of Malacozoz, Bl. Divi- 
ded into: Order, 1.Cryptodibranchiata; 2. Cellulacea; 3. Poly- 
thalamacea. The first consisting of cuttle-fish, &c. which are 
destitute of shells; the second composed of those microscopic 
cellular bodies, which are regarded as shells by some authors; 
and the third containing the true chambered shells. 
CEPHALO’PODA. Cephalopodes, Lam. (Kedany, cephale, head ; 
Toda, poda, foot.) The fourth order of the class Mollusca, Lam. 
containing molluscs, with a series of arms surrounding the head, 
which is placed above a sack-shaped body. This order is divi- 
ded into Polythalamia, or many chambered shells; Monothalamia 
or single chambered Cephalopods and Sepiaria, or Cuttle-fish. 
Fig. 463 to 488. 
CEPO'LIS. Montf. Belonging to the genus Hexix, Auct. 
CERI’'THIUM. Auct. Fam. Canalifera, Lam. Entomosto- 
mata, Bl. Descr. Elongated, narrow, ribbed, tuberculated or 
rarely smooth, with a lengthened, turrited, pointed, pyramidal 
Spire, consisting of numerous whorls; aperture sub-quadrate, 
terminated anteriorly, by a tortuous canal; outer lip thickened, 
sometimes reflected, expanded; inner lip thickened posteriorly ; 
operculum, horny, spiral, with numerous whorls. Obs. The 
freshwater shells described as Cerithia by Lamarck, are separa- 
ted under the name Potamis, and may be known by the thick, 
horny epidermis. Tristoma, Desh. has the posterior sinus 
and the canal closed, except at the extremities. Cerithium 
Telescopium does not appear to present the same characters as 
the other Cerithia, and has been separated by some writers under 
the generic name Telescopium. Cerithium Aluco, fig. 372. 
CERVICOBRANCHIA’TA. Bl. The second order of Para- 
cephalophora Hermaphrodita, Bl. containing symmetrical, pa- 
telliform shells, divided into the families Retifera and Bran- 
chifera. 
CE’TOCIS. Montf. Placed by De Blainville in his section of 
Belemnites, characterized as having small folds at the apex. Ex. 
B. Penicillatus. 
CETOPIRUS. Ranz. Coronuia Batz@naris, Auct. fig. 16. 
CHA’MA. Linn. Fam. Camacea, Lam. and Bl. Descr. Ine- 
