CLEODOBA. lis 



CLAVATE. When one extremity of the shell is attenuated, and 

 the other becomes suddenly ventricose or globular, it is said to 

 be Clavate. Ex. Murex HausteUum, fig. 396. 



CLAVATULA. Lamarck, 1801. The generic name by which 

 Lamarck originally distinguished those species of Pleurotoma 

 which were remarkable for the shortness of their canals. In his 

 system, howeyer, they are re-united to Pleurotoma. P. Strom- 

 biformis. Beachistoma, Swainson. PI. xvi. fig. 381. 



CLAVICANTHA. Swainson, 1840. Clavatuta, Lamarck, 

 1801. 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, 

 Myochama, &c. 



CLAVULIlSrA. D'Orb. A genus of microscopic Eoraminifera. 



CLEIDOTHJEEUS. Stutchbury, 1835. (Gaipoe, hinge, KXelq, 

 clavicle.) Fam, Chamacese or Myariae, Lam. — Descr. Inequi- 

 valve, 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. — 06s. This 

 shell is like Chama in general form, but is distinguished by the 

 clavicle or shelly appendage from which its name is derived. PI. 

 iii. figs. 75, 76. 



CLEMENTIA. Gray, 1840. Venus Papyracea. "Wood's Supple- 

 ment, fig. 8. See Monograph of Veneridse, forthcoming in Pt. 

 xiii. xiv. Thesaurus Conchjiiorum, by the Author. 



CLEODORA. Pe?: et Les. Fam. Pteropoda, Lam. Thecosomata, 

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

 and oval aperture. PI. xii. fig. 221, C. cuspidata. 



