286 



LAND AND FRESH- WATER SHELLS OF N. A. [PART L 



Helix capillacea, Pfeiffer, Symbolae, II, 24, not Fer., teste Pfr. 

 Omphalina cuprea, Rafinesque, £uum. and Ace. 3; ed. Binney and 



Tryon, p. 67. 

 Ilyalina fuliginosa, Tryon, Am. Journ Conch. II, 248, pi. iii, f. IG (18G6). 



Has been found in nearly all the Northern, Western, Middle, 

 and some of the Southern States. In one case I have known of 

 its being found at the northern side of Lake Superior. 

 Also in Canada. 



Animal (see p 283). 



Jaw very arcuate, of almost uniform breadth, 

 ends blunt ; anterior surface with transverse strife ; 

 concave margin simple, with a well-developed, 

 blunt, median projection. 



Lingual membrane very broad, composed of 87 rows (64—1—64) 

 of one hundred and twenty-nine long slender teeth each ; centrals 



Fig. 511. 



Jaw of Zonites 

 fuliginosa. 



Fig. 512. 



Liiiyual dt'Utit-.ou ot Ziinitcs fuUginona. 



tricuspid, laterals 10, bicuspid, in a straight transverse row; uncini 

 curved, aculeate, in a somewhat diagonal row. 



Fig. 513. 



Zonites cadlica, Pfr. — Shell umbilicated, depressed, fragile, 

 shortly striate, white with a reddish horn-colored epidermis ; spire 

 slightly elevated, apex delicate; whirls five and a 

 half, rather convex, the last much broader, rather 

 flattened below, excavated around the tunnel-like, 

 minutely closed umbilicus ; aperture large, ob- 

 liquely oval ; peristome simple, thin, with ends 

 approaching, joined with a very light callus, the 

 columellar one scarcely broadened. Greater diam. 

 Zonites caduca. 27, lesser 22 ; height 14 mill. 



