22 



AMNICOLA ATTENUATA, Hald. 



PLATE 1. FIG. 13. 



A testa, columnari, vix perforata, sutura profunda. Long. 

 7 mm. 



SYNONYMS AND REFERENCES. 



A. ATTENUATA, HALD. J. Acad. Nat. Sci., vol. viii.p. 200. 

 DESCRIPTION. 



ANIMAL black. 



SHELL unusually long, slender, with 6 or 7 

 obliquely revolving, very convex whirls, sepa- 

 rated by a deep suture; aperture small, ovate, 

 with the peritreme level and continuous; labium 

 in contact with the body whirl, leaving scarcely 

 any perforation. 



COLOR pale green beneath an extraneous coat- 

 ing of black. 



GEOGRAPHICAL DISTRIBUTION. Taken from a 

 spring in Montgomery county, Virginia, con- 

 nected with Roanoke river. 



I am not confident that this is not the adult of 

 nicliniana, as there is a very close resemblance 

 between that shell and the young of this species 

 when it has but 4 volutions. In the latter, the 

 aperture appears to be rather contracted. 



