177 



formed iiito small cavities (giving the shell a denticu- 

 lated appearance) the rtbs crost by most minute spiral 

 striae ; aperture oval oblique, strongly marginated, 

 pillar lip not reflected. ...0,08. Wey mouth, rare. 



C. DENTICULATA. F. p. 306, TURBO D. Mont, 

 p. 315. D. p. 859. Lin. T. 8. p. 173. Conic, 

 subpellucid, white, the apex obtuse ; whorls six. each 

 with nine or ten coarse ribs projecting at the top of each 

 spire and forming indentations as in the last ; aperture 

 suborbicular, outer lip thickened by a rib, pillar lip 

 smooth and indented, with one or two small tubercles 

 at the base adjoining the ribs. 0,22... 0,1 1. Weymouth. 

 The ribs are not undulated as in the preceding, but 

 rim obliquely to the left. 



C. SEMICOSTATA. F. p. 307. TURBO S. Mont. p. 

 326. and Sup. p. 129. t. 21. f. 5.D. p. S37. 

 Lin. T. 8. p. 162. T. ELEGANS. Lin. T. 3. p. 66. t, 

 13. f. 31,2. -Short, conic, white, obtusely pointed; 

 whorls four or five, rounded and well defined ; wrought 

 with faint ribs and fine obsolete transverse striae on the 

 body whorl, the ribs not extending to the lower part 

 where the striae are most conspicuous ; aperture subor- 

 bicular, pillar lip slightly reflected. 0,04... 0,08. In 

 <sand, Devon, 



H 3. 



