44 new-york fauna — mollusca. 



Helix rufa. 



PLATE III. FIG. 30. A. B. — (STATE COLLECTION.) 



Description. Shell moderately large, subglobose, thin, with the apex slightly elevated. 

 Whorls five, convex, with numerous distinct oblique lines of growth. Spire somewhat ele- 

 vated, polished. Suture very distinctly impressed. Lip simple, somewhat thickened beneath, 

 dilated at its junction with the body-whorl, and almost reflected over the umbilicus. Umbili- 

 cus moderate, deep. 



Color. Uniform reddish brown. Diameter, 0'7. Height, 0'5. 



This shell was sent to me from the highlands of Rockland and Orange counties. I referred 

 it originally to the inornata of Say ; but a reexamination of the shell has satisfied me that it 

 is specifically distinct, not only in its color, but the elevation of its spire, and the shape of 

 the outer lip. 



Helix lineata. 



Helix lineata. Say, Nich. Encycl. No. 11. Joura. Acad. Nat. So. Vol. 1, p. 18, Vol. 2, p. 373. 

 H. id. Binney, Bost. Jour. Nat. History, Vol. 3, pi. 29, fig. 3. 



H. id. Gould, Invertebrata of Mass. p. 179, fig. 103. 



Description. Shell minute, thin and polished, orbicular, very much depressed. Whorls 

 four, flat above, higher than broad, and covered with numerous parallel raised revolving lines. 

 Suture distinctly impressed. Lip simple, with two and occasionally three pair of white 

 conical teeth, visible through the body-whorl. Umbilicus very large and deep, exhibiting all 

 the volutions. 



Color. Light greenish, frequently covered with a dusky epidermis. Diameter, 0*2. 



This minute species has been noticed from Vermont to Maryland. I have received speci- 

 mens from the neighborhood of Troy, in this State. It is usually found under stones and 

 leaves, and attached to rotten trees. It has a strong resemblance to a Planorbis, and may 

 be, as Dr. Gould suggests, the P. parallelus of Say. 



Helix chersina. 



PLATE XXXV. FIG. 338. 



Helix chersina. Say, Journal Acad. Nat. Sciences, Vol. 2, p. 156. 



H id. Binkey, Bost. Jour. Nat. History, Vol. 3, pi. 24, fig. 6. 



H. id. Adams, American Journal Science, Vol. 40, p. 273. 



H. id. Gould, Invertebrata of Massachusetts, p. 185, fig. 105. 



Description. Shell minute, elevated, conic, pellucid, thin, very smooth and shining. 

 Whorls six, smooth, with a deep suture. Aperture semilunar, narrow, much higher than 

 broad, of about an equal width above and below : lip simple : base convex. Umbilical region 

 indented but closed. Color. Smoky horn-color. Diameter, 0*1. 



