h 



+ 



inhabiting the United States^ 485 



\ 



thought that Helix clausa^ Say, was a small variety of 



this shell ; but the rounded aperture, represented in the ' 



figure of that shell given by Mr. Say, precludes that sup- 



* position. The individual figured in our plate is a large 

 one. 



6. HELIX SUBGLOBOSA. 



^n 



Plate XVII. 



H. tesM subglobosEt, imperforatri, lute^ ; anfractibus glabris, ultimo 

 anfractu ventricoso ; labro albOj interne incrassatOj subreflexo. 



\ 



Synonyms and References.. 



r 



Helix subglobosa, Nobis, 





Desciuption. 



Animal. Head and neck blackish, with a slisht tinge 

 of brown ; tentaculas' smoky ; eyes filack ; base of foot 

 inky, posterior extremity dirty flesh-color. Foot rather 

 slender, terminating acutely. Respiratory foramen sur- 

 rounded with a blackish circle. Genital orifice indicated 

 ty a blackish spot a little behind the large tentacula of 



the right side. Length about twice the breadth of the 

 shell. 



Shell, Sub-globose : epidermis^ olivaceous-yellow, 

 shining, smooth r whirls, from four to five, convex: spire, 

 somewhat elevated : suture, at the extremity of the last 

 whirl curved towards the aperture: lip slightly reflected, 

 white, obsolete on the base, with the margin thickened 

 internally ; aperture rounded, slightly contracted at the 

 base by the thickening and indentation of the lip: umbil- 



