FAMILY LIMNIADjE — LIMNEA. 69 



LlMNEA CAPERATA. 

 PLATE IV. FIGS. 66 & 69. — PLATE V. FIG. 79. Youico ! 



Limneus caperalus. Say, Des. terr and fluv. shells, p. 23. 



L. umbilicala. Adams, Bost. Journ. Nat. Hist. Vol. 3, p. 315, pi. 3, fig. 14. 



L. id. Gould, Invertebrata of Mass. p. 218, fig. 149. 



Ir id Haldeman, Monog. Limniades, p. 34, pi. 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. Pillar-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 striae, was procured at Sandy pond near Lake 

 Ontario, Oswego county. They were numerous on the upper surface of the leaves of the 

 Pond-lily. 



LlMNEA PALLIDA. 



PLATE IV. FIG. 67. 



(STATE COLLECTION.) 



Lrnrnta pallida. Adams, Am. Jour. Sc. Vol. 39, p. 374 ; Vol. 40, p. 208. Id. Bost. Jour. Nat. Hist. Vol. 3, p. 324, 



pi. 3, fig. 3. 

 X. id. Haldeman, Monog. Limniades, p. 45, pi. 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. 



