44 NEW-YORK FAUNA — MOLLUSCA. 
HELIX RUFA. 
PLATE Ill. FIG. 30. a. 8. —(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 znornata of Say; but a reéxamination 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. 
HeELix LINEATA. 
Helix lineata. Say, Nich. Encycl. No. 11. Journ. Acad. Nat. Sc. Vol. 1, p. 18, Vol. 2, p. 373. 
beh ced Binney, Bost. Jour. Nat. History, Vol. 3, pl. 29, fig. 3. 
H. id, Goucp, 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. 
HeEix CHERSINA. 
PLATE XXXV. FIG. 338. 
Helix chersina. Say, Journal Acad. Nat. Sciences, Vol.2, p. 156. 
H id. Binney, Bost. Jour. Nat. History, Vol. 3, pl. 24, fig. 6. J 
HH id Apams, American Journal Science, Vol. 40, p. 273. 
H. id. Goutp, 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. 
