FAMILY HELICIDjE — 8UCCINEA. 53 



GENUS SUCCINEA. Draparnaud. 



Animal elongated, spiral, larger than the shell : tentacles four. Amphibious. Shell ovate, 

 subelongate, pellucid straw-colored, very thin : aperture very large, oval, entire, rounded 

 before, angular behind : lip simple. Whorls three. 



SUCCINEA OVALIS. 

 PLATE IV. FIG. 51, Vak., and 52.— (STATE COLLECTION.) 



Succinea ovalis. Say, Nich. Eneycl. No. 2, Jour. Ac. Nat. Sc. Vol. 1, p. 15, and Vol. 2, p. 163. 

 S. id. Adams, American Jour. Science, Vol. 40, p. 270. 



S. id. Gould, Invertebrata of Mass. p. 194, fig. 125. 



Description. Shell suboval, diaphanous. Whorls nearly three, oblique. Body very large. 

 Spire small, but little prominent, somewhat obtuse. Columella much narrowed, so as almost 

 to permit a view of the interior apex from the base of the shell. Scarcely any calcareous 

 deposit on the pillar-lip. 



Color. Pale yellowish. Animal pale, with black stripes on its neck, and squares or bands 

 on its sides. 



Length, 0-3 -05. 



Var. a. Minutely striated and distinctly impressed with a medial revolving line, large. 



This is a common species about the margins of ponds, and in damp places. The shell is 

 so vitreous, according to Dr. Gould, as to permit the viscera and circulatory apparatus to be 

 seen through it. The distinctive characters of the species by the shell alone are so few, that 

 when I obtained the var. a. from streams in Rockland county, I supposed that it was quite 

 distinct enough to form a separate species under the name of lineata. Such a course in this 

 genus now appears to me premature, until I succeed in obtaining the living animal. The 

 typical form of this species (fig. 52) bears a striking resemblance to S. putris, var. y. of 

 Ferussac (Hist. Nat. Moll. pi. 11, a. fig. 7-8). 



Succinea obliqua. 



PLATE IV. FIG. 53. — (STATE COLLECTION.) 



Succinea obliqua. Say, Long's Eiped. St. Peters, Vol. 2, p. 260, pi. 15, fig. 7. 



S. id. Adams, Am. Journal of Science, Vol. 40, p. 270. 



t 



Description. Shell oblong-oval, nearly pellucid. Whorls three, very obliquely revolving, 

 and distinctly wrinkled. Spire a little prominent. Aperture sub-oval, sub-oblique. 

 Color. Pale amber. Animal: tentacles margined posteriorly, and tipped with black. 

 Length, 0*5 -09. 



