56 



AMPULLARIA. 



simile of the outline of Say's figure, and fig. 94 of Mr. Lea's of A. 

 hoj^etonensis. I have no doubt of the identity of this last named 

 species with depressa after examining the typical specimen. No. 

 8986 and 8987 were labelled by Mr. Lea as hopetonensis. Hal- 

 deman also places it in the synonymy. The original description 

 here follows, and an outline of the figure (6l)- 



Fig. 94. 



Ampullaria hopetonensis. — Shell subventricose, smootli, flattened a.bove, 



iimbilicate, yellowish-brown, banded ; su- 

 tures impressed ; whirls 5 ; aperture sub- 

 ovate, white. 



Habitat Hopeton, near Darien, Ga. Prof. 

 Shepard. My cabinet ; cabinet of Prof. 

 Shepard. Diam. 1.4, length 1.7 inch. I 

 owe to the kindness of Prof. Shepard of 

 New Haven this interesting shell. It was 

 procured by him during his late geological 

 investigations in our Southern States, with 

 other shells, descriptions of which will be 

 found in these memoirs. It resembles the 

 A. fasciata, Lam., but is less globose, the 

 whirls of our species being somewhat iiat- 

 tened on the side and top. It differs from 

 the-yl. depressa, Say, described in Major 

 Long's Exp. to St. Peter's River (subse- 

 quently changed to A. paludosa in the Disseminator) in being less globose, 

 and in being flatter on the side and superior part of the whirls. {Lea.) 



DeKay gives as synonyms A. penesima, Say, and A. dissemi- 

 nata, Say. The names do not occur in Say's writings. 



This genus does not appear to belong to the molluscous fauna 

 of the United States, but rather to that of South America. I have 

 not, therefore, included the Mexican species. 



Amp ullaria hopetonensis. 



Spurious and Extra-limital Species. 



Ampullaria horealis, Valenciennes, in Humboldt and Bonpland, Rec. d'Obs. 

 II, 260, is probably Lunatia heros, Say. Ferussac (Bull. Zool. 1835, 

 2d sect. p. 33), in reviewing Valenciennes' work, refers it to a large 

 marine Natica figured by Chemnitz. The description is as follows : — 



"Shell ventricose, globose, heavy, thick, smoky white, broadly 

 umbilicated, with longitudinal striae but no wrinkles. 



St. Pierre and Miquelon, near Newfoundland. 



This species resembles Am. Guyanensis. Its proportions are the 

 same ; it is longitudinally striate, but its shell is at least three times 



