

FAMILY HELICIDjE — HELIX. 43 



Helix striatella. 



PLATE III. FIG. 40. a. b. c. — (STATE COLLECTION ) 



Helix striatella. Anthony, Journ. Nat. Hist. Vol. 3, p. 298, pi. 3, fig. 2. 



H. ruderata? Studer. Adams, Amer. Jour. Science, Vol. 40, p. 273 and 408. 



H striatella. Gould, Invertebrata of Mass. p. 178, fig. 112. 



Description. Shell small, orbicular, polished, thin, much depressed ; the spire somewhat 

 elevated. Whorls four to five, flattened above, rounded beneath, with a distinctly impressed 

 suture, minutely but distinctly marked with elevated sharp lines, which are most obvious on 

 the circumference of the shell ; these become obsolete on the whorls near the apex. Aperture 

 oblique, rounded. Base excavated, passing into a broad and deep umbilicus. Lip thin and 

 simple. 



Color. Uniform transparent horn, or yellowish or reddish brown. Animal with bluish black 

 tentacles ; margin and posterior part of the foot white ; foot transparent, terminating acutely 

 behind. 



Diameter at the aperture, 0*2. Height, 1 1 . 



This beautiful little species has for a long time been considered as identical with the H. 

 perspectiva of Say. It is, however, a smaller and more delicate shell ; the ridges are more 

 conspicuous, and it has fewer whorls. 



It has been found near Oriskany and Troy in this State, about old timber and under the 

 bark of rotten trees. Its hitherto ascertained geographical range is from Vermont through 

 Ohio. 



Helix solitaria. 



PLATE III. FIG. 41. a. B. - (STATB COLLECTION ) 

 Helix solitaria. Say, Journ. Acad. Nat. Sciences, Vol. 2, p. 157. 



Description. Shell large, solid, subglobose. Spire conic-convex. Volutions five and a 

 half, wrinkled across and rounded : suture rather deeply impressed. Aperture wide, em- 

 bracing rather a small portion of the penultimate whorl. Lip simple, not reflected. Umbili- 

 cus large, exhibiting distinctly all the volutions. 



Color. Reddish horn-color, with two or more revolving dark reddish lines. 



Diameter 1*0-1*8. Height,  7. 



This species was first designated by Mr. Say, who noticed it in Missouri. It has since 

 been found, as I am informed, in Ohio. The specimen which furnished the figure was said 

 to have been obtained from Pennsylvania. It may probably be detected in this State. 



6* 



