North American Helicidce. 285 



have been so much misapprehended. A specimen deposited 

 by Say in the Cabinet of the Academy of Nat. Sci. of Phila- 

 delphia is still preserved there, — it entirely agrees with his de- 

 scription, and with Binney's figure (PI. xxxix. fig. 4.), in the 

 " Terrestrial Mollusks." 



Dr. Binney in the Bost. Jl. unites fatigiata with H. plicata 

 Say, H. Troostiana Lea, and H. Dorfeuilliana Lea, adopting 

 the first specific name, that of plicata, otherwise having priority, 

 being preoccupied. His figure (PI. xix. fig. 3) represents 

 Troostiana Lea, a nearly allied form. The same views are 

 expressed in the Terr. Moll. Binney gives there two figures, 

 one (PI. xxxix. fig. 4) of fatigiata, and the other (fig. 2) of 

 Troostiana under the name of plicata. 



Pfeiffer treats fatigiata Binn. {H. Troostiana Lea), H. pli- 

 cata Say, and H. fatigiata Say, as synonyms of H. Texasiana 

 Mor., which is certainly quite distinct, — adopts H. Troostiana 

 Lea as a good species, and confounds H. Dorfeuilliana Lea 

 with another species. 



The same errors prevail in Chemnitz (ed. 2), and in Beeve's 

 Conch. Icon., in neither of which works is fatigiata Say 

 figured. 



Deshayes (Fer. Hist.) has fatigiata Say, and fatigiata Binn. 

 in his synonymy of H. Texasiana Mor., but describes and 

 refers to a figure of the former, under the name of Dorfeuil- 

 liana Lea, of which he gives plicata Say as synonym. He 

 refers to a specimen in Ferussac's collection, labelled plicata 

 Say, but Say's name being preoccupied adopts Dorfeuilliana 

 Lea, mentioning that he had himself proposed jinitima. He 

 admits the specific value of Troostiana Lea, with much doubt. 



Shuttleworth (Bern. Mittheil.) points out the errors of Pfeiffer, 

 correctly determines fatigiata Say, and Dorfeuilliana Desh., 

 and also Texasiana Mor., but at the date of that publication 

 misconceived Dorfeuilliana Lea, and plicata Say. 



In justice to Mr. Shuttleworth I subjoin a copy of his accu- 

 rate description, and of his observations ; they are in a work 



