226 On the Clausiliix. of America. 



Clausilia tridens Kuster Moti. p. 12. t. 1. f. 1-4, 1847. 



Pfr. Mon. Hel. Viv. II. p. 396. No. 1. (6.) 1848- 



Jay's Cat. p. 247. 1850. 



Fer. et Desh. Hist. II. p. 234. No. 1. t. 



166. f. 1. - - - - 1820-1851. 



Station. — Unknown. 



Habitat. — Spain ; Chemnitz. Near London ; Dillwyn. Malta ; 

 Sowerby. Unknown ; "Wood. Porto Eico ; Ferussac : also 

 Lamarck : also Beck : also Deshayes : also Rossmassler : also 

 PfeifFer : also Jay. Porto Rico, and probably other West India 

 Islands ; Kiister. Porto Eico ; Knox ! Biise ! in Mus. Amh. 



(1.) Dillwyn gives the following erroneous synonymy, to 

 which much of the confusion as to C. tridens may be attributed* 

 " Turbo lahiatus Mont. Test. Brit. p. 362. 1. 11. f. 6. (1803) 



Maton and Racket, in Linn. Trans. 



VIII. p. 180. (1804). Dorset Cat. p. 51. 



t. 21. f. 15. (1813.) 

 Turbo tridens Chem. IX. P. 1. 115. t. 112. f. 957 ? 



perversus Var. E. Gmelin, p. 3610? 



Strombiformis perversus Da Costa Brit. Conch, p. 107. t. 5. f. 15. 

 Bulinus perversus Brug. Enc. Meth. p. 351. f 



Montagu, in his work (republished in Chenu. Bibl. Conch. 

 Vol. 4. 1st series, p. 161. 1846,) as Syn. of T. lahiatus, has S. 

 perversus Da Costa, and T. tridens Chem. but the latter with a ? : 

 he states that he preserves the name lahiatus, of which he 

 believes Dr. Solander was the author. 



Forbes and Hanley in Hist. Brit. Moll. vol. iv. p. 121 (1852) 

 mention that perhaps Da Costa's figure, copied in the Dorset 

 Catalogue, " although from its rudeness it is impossible to pro- 

 nounce with certainty upon it," was drawn from the British C. 

 nigricans. For a description of C. labiata (Turbo) Mont., from 

 France and Northern Italy, vid. Pfr. Mon. Hel. Viv. II. p. 458. 

 No. 154. Maton and Racket, (republished in Chenu. Bibl. 

 Conch. 2d ser. vol. i. p. 204. 1845.) describe Turho lahiatus^ 

 referring to Da Costa, Chem. with a ?, to Mont., and also to 

 Olivier, Voy. dans I'empire Othoman, t. 17. f. 6. (1804). The 



