436 HELICIDiE. 



denticles ; at the columella it rises against a distinct umbilical per- 

 foration. Length two and one half, diameter one and a half milli- 

 metres. 



Near Lake Superior, Fort Resolution, Great Slave Lake (Ken- 

 nicott). New England? 



Pupa fallax. 



Fig. 123. 



Shell turreted, dusky ; whorls six, smooth, convex ; suture distinct ; aperture 

 sub-oval; lip widely reflected; umbilicus distinct. 



Ci/dostoma marginata, Say, Journ. Acad. Nat. Sc. ii. 172 (1821); Binnet's ed. 22. 

 Bidimus marginatus, Pfeiffer, Malac. Blatt. ii. 94; Mon. Hel. Viv. iv. 414. — W. G. 



BiNNEY, Terr. Moll. iv. 136. 

 BuUmus fallax, Gould, in Terr. Moll. ii. 288, pi. 52. 

 Papa fallax. Say, Journ. Acad. Nat. Sc. v. 121 (1825); Binney's ed. 28. — Gould, 



Inv. 192, fi<,^ 123 (1841), excl. syn. placida ; Bost. Journ. Nat. Hist. iv. 357, pi. 16, 



fig. 15 (1843). -De Kay, N. Y. Moll. 51, pi. 35, fig. 331 (1843). — Pfeiffer, Mon. 



Hel. Viv. ii. 309 ; iii. 533 ; in Chemnitz, ed. 2 (1844), 58, pi. 12, figs. 20, 21. 

 Pupa Parraiana, Orbigny, Moll. Cuba, 181, pi. 12, figs. 9-11 (1853). 

 Pnpa albilahris, Adams, Vermont Moll. 158 (1842) ; Sillim. Journ. [1] xl. 271. 

 Papilla fiillax, Morse, Am. Nat. i. 609, fig. 53 (1868). 

 Pahidina turrita, Menke ? Syn. Meth. 40. 



Shell small, turreted, regularly and not rapidly tapering to a 



somewhat pointed apex ; color dusky or light horn color ; whorls 



six, shining, moderately convex, very slightly and finely 



Fig. 693. .111 II- 1 1 ,1 



wrinkled ; suture well-impressed ; aperture less than one 

 third the length of the shell, rounded oval, somewhat 

 irregular ; the preceding whorl forms a nearly transverse 

 boundary above, and is usually enamelled ; the pillar lip 

 is nearly straight, and turns abruptly at the front, so as 

 to form nearly a right angle ; front broadly curved ; outer 

 lip white, widely and equally reflected and thickened ; 

 nmbilicus distinct. Length, one fifth of an inch ; breadth, 

 one fifteenth of an inch. 



I have seen l)ut two or three specimens of this shell which have 

 been found in Massachusetts, one of which was sent me liy Dr. L. 

 M. Yale, from Martha's Vineyard ; I have seen others from Rhode 

 Island. It is found abundantly from Nebraska to Texas, and from 

 New England to South Carolina ; also in several of the West India 

 Islands. 



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