[ 50 ] 

 6. Anguispira Cumberlandiana, Lea. 



Plate 4, figure 48. 

 Lenticular, acutely carinated, thin, coarsely ribbed, striate; 

 spire convex, much depressed, suture not prominent ; wborlg 

 5, slowly increasing, margined by a carina; aperture some- 

 what rhomboidal; umbilicus broad and deep. Pale yellowish 

 or ash-cplor, with irregular transverse brown blotches. 



Diam. 13-18, height 5-6 mill. Cr. , ■ 



E. ''Tennessee. 



Very close in color and striation to allernata, but differs en- 

 tirely in its very depressed, lenticular form and Yery^ acute 

 carina. 



PATULA, Held. 

 1. Patula perspectiva, Say. 



Plate 4, figure 50. 



Nearly discoidal, slightly convex above, and concave be- 

 low, strongly striate; whorls 6, suture deeply impressed; aper- 

 ture small, fths rounded, generally in adult shells with a very 

 slight tubular thickening (scarcely. a too^A) within the base; 

 uml)ilicus very wide, cup-sha))ed, shallow, exhibiting all the 

 volutions. Corneous, reddish-browu. 



Diam. 9, height 3 mill. 



W. New York to N. Ueorgia, westward to Arkansas and 

 Michigan. 



The tootli described by Binuey appears to be an imperfectly 

 developed fulcnim. 



2. Patula striatella, Anth. 



Plate 4, figure 51. 



Depressed convex, nearly discoidal; whorls less than 4, with 

 delicate oblique striae; suture distinct; aperture rounded, 

 transverse; umbilicus very large, shallow. Light horn-color, 



Diam. 5, height 2i mill. ^ r^y\A:^Sk^Sii^~f'' ^.;,, . 



]\[aine to Great Slave Lake, B. A., southwards through W. 

 New York and Pennsylvania to Ohio Eiver, and westward to 

 Kansas; District of Columbia. 



Much smaller, with fewer whorls, and more elevated than 

 No. 1. In the New England States it entirely replaces /S. 

 jierspectiva. 



