FAMILY LIMNIAD^ — LIMNEA. 71 



LiMNEA HUMILIS. 



PLATE IV. FIG. 71. A. ». 



(STATE COLLECTION.) 



Limnetis humilis. Say, Jonr. Acad. Nat. Kc. Vol. 2, p. 378. 



L. modiceltut, var.? Id. Jour. Acad. Nat. Sciences, Vol. 2, p. 122. 



L. modtcella. Gould, Invertebrata of Mass. p. 218, fig. 151. 



L. humilis, Haldeman, Monog. Limniades, p. 41, pi. 13, figs. 1-8. 



Description. Shell ovate-conic. Volutions five to six, convex ; the terminal one very 

 minute. Aperture and spire subequal, oval, regular. Fold on the columella occasionally 

 distinct. 



Color, varying from pale reddish to brownish horn. Animal translucent, except the cen- 

 tral portion, which is very light brown. Tentacles short, with a black point on the anterior 

 basal edge. 



Length, 0-2-0-4. 



Found from Maine to South-Carolina inclusive. The typical form of this species, accord- 

 ing to Mr. Haldeman, is short and thick, and such are found near the Susquehannah at 

 Owego ; the northern specimens are more slender, and form the variety described as modi 

 cellus. 



LiMNEA REFLEXA. 



PLATE rV. FIG. 72. a. b. — FIG. 65, vaE. 



(STATE COLLECTION.) 



Limncus reflexus. Say, Jour. Acad. Nat. So. Vol. 2, p. 167. 



L. exilis. Lea, Am. Phil. Trans. Vol. 5, p. 114, pi. 19, fig. 82. 



L. refiexa. Haldeman, Monog. Limniades, p. 2C, pi, 8, figs. 1 and 8. 



Description. Shell elongated, tapering, subacute. Whorls six to seven, flattened or slightly 

 rounded, with transverse sinuous wrinkles, and very minute revolving lines. Suture deeply 

 impressed, revolving very obliquely. Pillar-lip with a fold more or less distinct : lip everted 

 at the base over the umbilicus, which is, however, distinct : apex polished. 



Color. Brownish horn, becoming blacker towards the tip ; occasionally covered entirely' 

 with a black epidermis. The young are amber-colored. 



Length, 0-2 -0-5. 



The specimens illustrating this species were obtained near Fairfield, Herkimer county. 

 Fig. 65 represents a specimen, nearly • 8 in length, from the same locality. 



