296 North American Helicidce. 



" Hab. — In Honduras (Dyson). 



" Obs. — Spec. 6 vidi. Species nullo modo cum H. Dorfeuilliana Lea 

 confundenda, qua?, ultimo anfractu subtus devio umbilicum tantum spu- 

 rium et rimalem ostendente, revera solummodo perforata est. Differt 

 insuper H. Dorfeuilliana Lea, dente parietali magno, fere tetragono, 

 linguiformi, peristomatis margina jungendo. II. Dorfeuilliana Lea (ad 

 specimen unicum descripta) vix nisi II. Troostiana Lea varietas. H. 

 Dysoni EL fallaci et Hopetonensi proxime affinis videtur." 



Shuttle worth gives no measurements. 



In January, 1856, Mr. Shuttleworth wrote to me, acknow- 

 ledging receipt of some shells sent to him for examination, and 

 which I had not then determined. 



As to one, agreeing with my figure 26 on PI. ix., he said, 

 " this is H. Dorfeuilliana Lea, which I had never seen, but I 

 find Albers has it unnamed from Texas, and I was on the point 

 of describing it as a new species, so little does Lea's figure 

 agree." The shell referred to may be a variety of Lea's species, 

 to which certainly it is allied ; it is distinct, however, from fati- 

 giata, Troostiana, and Hasardi. 



"With respect to another shell, the same as my figure 25 a. 

 PI. ix., Shuttleworth remarked, " this is, I suppose, the true 

 H. plicata Say, but not being able to compare Say's descrip- 

 tion, I am not sure, — it is at all events distinct from II. Dor- 

 feuilliana Lea, fatigiata Say, and Troostiana Lea." 



I find on examination of Mr. Lea's original specimen of 

 Dorfeuilliana, that it entirely agrees with the form supposed 

 by Mr. Shuttleworth to be plicata Say. The magnified figure 

 of the aperture (PL ix. fig. 25 a.), taken from a specimen in 

 my cabinet, agrees nearly with Mr. Lea's figure (PL ix. 

 fig. 25). 



Pfeifter refers in the Synonymy of his Dorfeuilliana to the 

 figures in Chemnitz and Keeve, of which I annex copies (PL 

 ix. fig. 31, 32), in order to show how widely they differ from 

 Lea's species, and inasmuch as Shuttleworth refers to the 



