68 NEW-YORK FAUNA — MOLLUSCA. 
LIMNEA FRAGILIS. 
PLATE IV. FIG. 68. 
(STATE COLLECTION.) 
Helix fragilis. Lin. L. elodes. Say, Journ. Acad. Vol. 2, p. 169; Am. Conchol. pl. 31, fig. 2. 
EL. elodes. Gouup, Inverteb. Mass. p. 221, figs. 146, 147. Apams, Am. Journ. Vol. 40, p. 268. 
LL. fragilis. Hatpeman, Monog. Limn. p. 20, pl. 6, figs. 1-11, p. 53; pl. 15, fig. 1. 
Description. Shell oblong-conic, gradually acuminated. Whorls six, convex, with trans- 
verse lines, frequently marked with irregular elevated reticulations. Suture rather deeply 
impressed. Aperture generally shorter than the spire. Pillar-lip with an angular deposit of 
enamel. 
Color. Brownish tinged with yellowish, or amber-colored; occasionally with a dusky 
epidermis. Animal dusky, dotted with yellow. ‘Tongue spoon-shaped: mouth margined 
in front with a black horny plate. 
Diameter, 0°1-—0°3. Length 0°6-0°9. 
One of our most common species, and referred by Mr. Haldeman, after a direct comparison, 
to the L. fragilis of Europe. Ranges from Canada to Pennsylvania, and to the Pacific 
westward, 
LIMNEA UMBROSA. 
PLATE IV. FIG, 76. 
(STATE COLLECTION.) 
Limneus elongatus. Say, Journ. Acad. Vol. 2, p. 167. 
L. umbrosa. Ip. Am. Conchol. pl. 31, fig 1. 
LE, umbrosa. Avams, Am, Journ. Science. Vol. 40, p. 268. 
LL, idem. HatpEeman, Monograph Limniades, p. 24, pl. 7, figs. | - 8. 
Description. Shell elongated, ventricose. Whorls six, slightly convex. Surface with 
numerous minute spiral lines. Suture oblique, with little depth, but well marked. Spire 
slender : apex acute. Fold on the columella not well marked. Aperture wide, nearly straight 
on the inside, wide anteriorly, less than half the length of the shell. Body-whorl above 
longer than half the entire length, often marked with reticulated lines forming facets as in 
the preceding species. 
Color. Corneous, tinged with red or reddish brown. Margin of the lip lighter. Occasionally 
the surface with light longitudinal lines. 
Length, 1°3; of aperture, 0°7. 
This species occurs from Canada to Illinois. The first name imposed by Say having been 
preoccupied, he changed it to that which it now bears. 
