110 CLITIA. 



remarkable for the shortness of their canals. In his system, 

 however, they are re-united to Pleurotoma. Fig. 381, P. Strom- 

 biformis. 

 CLAVICANTHA. Sw. A genus separated from Pleurotoma, 

 Lam. consisting of species, which are described as "thick, 

 sub-fusiform ; the surface rugose, and the whorls sub-coronated ; 

 channel short ; slit assuming the form of a short, broad sinus. 

 C. imperialis, E. M. 440, spirata, E. M. 440, fig. 5, conica, E. M. 

 439, fig. 9, echinata, E. M. 439, fig. 8, Auriculifera, E. M. 439, 

 fig. 10." 



CLAVICLE, (clavis, a key.) A little key. This term is applied 

 to the bony appendage in the hinge of some species of Anatina, 

 (those included in the generic term Lyonsia) Cleidothserus, Myo- 

 chama, &c. 



CLAVULINA. D'Orb. A genus of microscopic Foraminifera. 



CLAVUS. Montf. A genus of microscopic Foraminifera. 



CLEIDOTHiERUS. Hutch. (Qaipog, hinge, KXelg, clavicle.) 

 Fam. Chamacejfi or Myarise, Lam. — Bescr, Inequivalve, irregular, 

 solid, attached ; with one cardinal, conical tooth in the free 

 valve, entering a corresponding indenture in the other ; and an 

 oblong shelly appendage, fixed by an internal cartilage in a 

 groove under the umbones ; muscular impressions, two in each 

 valve, one elongated, the other uniform — Obs. This shell is like 

 Chama in general form, but is distinguished by the clavicle or 

 shelly appendage from which its name is derived. Fig. 75. New 

 South Wales. 



CLEODORA. Per. et Les. Fam. Pteropoda, Lam Thecosomata, 

 Bl. — Bescr. Thin, transparent, pyramidal, with flat alate sides, 

 and oval aperture. Fig. 221, C. cuspidata. 



CLISIPHONITES. Montf. Microscopic. Lenticulina, Bl. 



CLITHON. Montf. Neritina Corona, spinosa, &c. Auct. fig. 325. 



CLITIA. Leach. Fam. Balanidea, Bl. Order, Sessile Cirripedes, 

 Lam. — Bescr. Sub conical, compressed, consisting of four un- 

 equal valves, two larger and two smaller, joined together side by 

 side, by the interlocking of their dentated edges, a process some- 



