succixEA. 445 



Ocmis SUCCIXEA, Draparnaud. 1801. 



Shell imperforate, thin, ovate or oblong ; aperture large, ob- 

 liquely oval ; columella simple, acute ; peristome simple, straight. 



Jaw with a sub-quadrate plate attached to its convex margin ; 

 strongly arcuate, ends pointed ; anterior surface smooth ; concave 

 margin simple, with a rostriform median projection. 



Lingual membrane with curving transverse series of teeth ; cen- 

 trals tricuspid ; laterals bicuspid ; uncini serrate. 



Succinea ovalis. 



Fig. 125. 



Shell sub-oval, pellucid, straw colored ; whorls three, oblique ; aperture large, 

 ovate. 



Succinea ovaJi.t, Gould, Inv. 194, fig. 125 (1841). —Adams, Vermont Moll. 270. —Bin- 

 key, Terr. Moll. ii. 78, pi. 67 o, iig. 3. — W. G. Binney, Tcit. Moll. iv. 37.— 

 Pfeiffer, Mon. Hel. Viv. iv. 814. — Morse, Journ. Portl. Soc. i. 30, fig. 77; pi. 

 9, fig. 78 (1864); Am. Nat. i. 607, fig. 48 (1SG8). — Tryon, Am. Journ. Conch, 

 ii. 237, pi. 2, fig. 22 (1866). — Not of Say. 



Succinea Dennnpii, Tryon, Am. Journ. Conch, ii. 237, ])\. 2, fig. 23 (1866). 



Shell ovate, somewhat conic, very thin, pellucid, watery horn 

 color, sometuiies tinted roseate ; peristome shining, very 

 minutely striate ; whorls three, the last compressed and ^'" '^'^' 

 elongate when viewed above ; spire short but acute ; suture 

 impressed ; aperture produced by a deep truncation of the 

 shell, elono-ated, more than three fourths the leno-th of the „ 

 shell, patulous, expanding anteriorly, exhibiting the interior 

 of the volutions ; when viewed on the side of the aperture, the con- 

 ical shape of the shell appears, the broadest part of the cone is 

 below the centre of the aperture, and it tapers gradually to the 

 apex. Extreme length, fifteen mill. ; of aperture, ten millimetres. 



Canada and the Northern and Middle States. 



This is not the S. ovalis of Say. That shell having been found 

 identical with S. obliqua, Dr. Gould proposed retaining the name 

 ovalis for this species. 



This species is found about the margins of ponds, and low, damp 

 places, where the surface is always moist. It crawls over the mud, 

 or up the stalks of plants ; and altliough it seems to be but little 

 incommoded by water, it cannot endure being entirely submerged, 



