290 



LAND AND FRESH WATER SHELLS OF N. A. [I'ART I. 



Fig. 519. 



Zonileg inarnala, 

 var. 



extending along the edges of the foot, and uniting above and 

 before its posterior termination. Behind the junction is a promi- 

 nent, subconical, bluish-white gland, on the ex- 

 tremity of the foot. 



Fig. 518 represents the usual form of the 

 species. A more globose form is figured in Fig. 

 519. It was found in the mountains near Ash- 

 vilie. Buncombe County, North Carolina, by Dr. 

 Ravenel. 



The shell which is described above is well 

 known in collections, and not easily confounded with any other. 

 It has been unfortunate in its synonymy, whose history is treated 

 at length and explained in the fourth volume of the Terrestrial 

 MoUusks and Annals of New York Lyceum quoted above. 



I have in my collection a curious specimen from the Pennsyl- 

 vania mountains in which are three well-developed sharp tooth - 

 like processes on the internal thickened margin of 

 the peristome. 



Jaw strongly arcuate, ends rapidly attenuated ; 

 anterior surface striated ; concave margin smooth 

 with an acute median projection. 



Lingual membrane with 37 rows of forty-seven 

 (23 — 1 — 23) teeth each ; centrals long, slender, tricuspid ; laterals 

 eight only, stouter, bicuspid ; uncini aculeate and curved. 



Fis:. ."320. 



Jaw of 

 Zoniles inornata. 



Fig. 521. 



Liugual dentition of Zonites inornala. 



Zonites SClllptilis, Blanp. — Shell scarcely perforate, suhorhicn- 

 lar, depressed, subpellucid, pale Loni-color above, of lighter shade bcUeaiL, 



