FAMILY LIMNIADA: — LIMNEA, . = 69 
LIMNEA CAPERATA. 
PLATE IV. FIGS. 66 & 69.— PLATE V. FIG. 79. Youne? 
Inamneus caperatus. Say, Des, terr. and fluv. shells, p. 23. 
LL. umbilicata, Avams, Bost. Journ. Nat. Hist. Vol. 3, p. 315, pl. 3, fig. 14. 
L. id. Gov p, Invertebrata of Mass, p. 218, fig. 149. 
Lid Hatpeman, Monog. Limniades, p. 34, pl. 11, figs. 1 - 9. 
Description. Shell conic. Whorls five or six, separated by a deep suture: apex pointed 
or entire. Lines of growth fine, but apparent. Surface closely covered with numerous and 
very fine spiral light-colored elevated epidermal lines: these become usually obsolete on the 
adult shell. Aperture ovate, semicircular or subrotund. PPillar-lip with a fold more or less 
distinct, and folding over the umbilicus. 
Color. Yellowish or reddish brown, occasionally with whitish or reddish varicose bands. 
Aperture frequently stained with reddish brown. Animal almost black, minutely and sparsely 
dotted with whitish : tentacles long and very flat : foot rounded behind. 
Length, 0°2 -0°4. 
My specimens were obtained from the Mohawk river. A variety of this species, beauti- 
fully reticulated with transverse and revolving striz, was procured at Sandy pond near Lake 
Ontario, Oswego county. They were numerous on the upper surface of the leaves of the 
Pond-lily. 
LLIMNEA PALLIDA. 
PLATE IV. FI1G. 67. 
(STATE COLLECTION.) 
Limnea pallida, Avams, Am. Jour. Sc. Vol. 39, p. 374; Vol. 40, p. 268. Ip. Bost. Jour. Nat. Hist. Vol. 3, p. 324, 
L. id. Bese ae Limniades, p. 45, pl. 13, figs. 11-13. 
Description. Shell conical, smooth, imperforate and fragile. Whorls five or six, slightly 
convex. Suture shallow, but well defined. Spire as long or longer than the aperture, with 
a subacute apex. Aperture ovate, symmetrical. Fold on the columella well marked and 
remarkably constant. Incremental lines very fine and undeviating, crossed by minute spiral 
corrugations. 
Color. Varying from pale ochraceous to white. Apex often tinged with brown. 
Length, 0°3 - 0-4. 
I am indebted to Prof. Emmons for specimens of this shell, which he obtained from Lake 
Champlain. 
