•* 



I 



iiikabiting the United States. 4S3 



k 



sub-triangular aperture, and the latter sometimes when 

 closely examined, by the rudiments of the tooth, exhib- 

 ited by a slight thickening in its place, resembling the 

 touch of a pencil of vai'nish over the epidermis. I have, 

 however, seen a few individuals which did not seem to 

 me to admit of doubt, but clearly to belong to the present 

 species. One of these has been represented in the plate. 

 A Hving individual from Arkansas, supposed to be of this 

 species, has also come under my notice, from a recollec- 

 tion of which, 1 have described the animal as blackish. 



It is a handsome species, somewhat resembling, though 

 not half as large as H. albolabris, Say, but rather more 

 globular, and with the umbilicus partially open. The 

 spire is more prominent, and the lip less widely reflected 

 than in that species. Future observation must decide 

 whether it is to be considered a distinct species or not ; 

 my impression is, that it will retain its place. 



5. HELIX PENNSYLVANICA. 



* 



Plate XVI. 



H. testa elevato-convexl, imperforate, corneo-rufescente ; anfracti- 

 bus tenuiter striatis, striis obliquis, confertis } spiri elerati, aplce 



margine 



umbilicali depressa. 



SVNONYMS AND REFERENCES. 



w 



Hehx Pennsylvanica, Green. Contributions of Maclu- 



rian Lyceum, No* i, p* 8- 



Description. 



Animal 



uniform 



foot lig 



transverse 



m 



'-If 



*4* 



