44 Mr. W. Clark on the lanthinse, Scalarise, 



are no lateral teeth nor siphonal inflection, and the inner surface 

 of the valves is opake white. 



1. Anatinella, Sow., Gray, P. Z. S. 1847, n. 570. A. Sieboldii. 



Fam. 10. Paphiad^, Gray, P. Z. S. 1847, 186. 



Chiefly distinguished from Madradoi by the imperfect develop- 

 ment of the cardinal tooth, which is simple, compressed, and with 

 a small process on the upper edge in the place of the second 

 tooth. 



A. Siphonal inflection distinct. 



1. Mesodesma, Deshayes. Shell ovate, subequilateral ; lateral 

 teeth short, smooth, subequal. M. novazelandice. 



2. Taria. Shell oblong, subequilateral, attenuated behind, 

 hinder slope keeled ; lateral teeth very small. T. Stokesii, n. s. 



3. Donacilla, Lamk. 1818. Shell elongate, wedge-shaped, 

 hinder slope truncated ; anterior lateral teeth elongate, hinder 

 short. D. cornea. 



4. Paphia, Lamk. 1801 ; Gray, P. Z. S. 1847, n. 572. Shell 

 ovate, cuneate, truncated and slightly keeled behind; lateral 

 teeth small, subequal, smooth. * Siphonal inflection short. 

 P. glahrata. ** Siphonal inflection elongate. P. ventricosa. 



5. Ceronia. Shell ovate, cuneate, truncated behind; lateral 

 teeth subequal, compressed, strongly cross-grooved. C. denti- 

 culata. 



B. Siphonal inflection none. 



6. Anapa, Gray, Syn. B. M. 1842; P. Z. S. 1847, 573. Shell 

 subtrigonal, ventricose, truncated behind ; lateral teeth subequal, 

 compressed, smooth. A. Smithii, V. D. Land. 



7. Davila. Shell ovate, cuneate, truncated behind; lateral 

 teeth unequal, anterior small, perpendicular. D. polita, n. s. 



[To be continued.] 



VL — On the lanthinse, Scalarise, Naticse, Lamellarise, and Velu- 

 tinse. By William Clark, Esq. 



To the Editors of the Annals of Natural History. 



Gentlemen, Norfolk Crescent, Bath, Nov. 25, 1852. 



Having, agreeably to my method of the classification of the 

 British MoUusca, published in the ' Annals,' N.S. vol. vii. p. 469, 

 constituted the family of the Pelorida, — forming, as I think, one 

 of the approaches to the Murices, also described in the ' Annals,' 

 vol. vii. p. 108, — I have thought that it would be a proper atten- 

 tion to naturalists, and justice to myself, to assign the reasons 



