4A6 HELICID^. 



and seems not to have the power of directing its way in the Avater, 

 though it will generally float. 



The animal is larger than the shell ; its color jDale, with minute 

 black points, which are assembled into stripes upon the neck, and 

 into scpiares, or bands, upon the sides ; the neck is granulate aljove ; 

 a l)lack line passes each side on the neck, from the tip of the tentac- 

 ula, disa])pearing under the shell. The shell is so vitreous, that 

 all the markings of the animal and colors of the viscera are seen 

 through it, as are also the circulating vessels branching across the 

 back, and the heart pulsating, and sending the fluids through them. 



Further particulars will be stated under *S. obliqua. 



Succinea avara. 



Fig. 127. 



Shell very thin, wrinkled, yello-\vish, whorls throe, rounded; suture deep; ap- 

 erture rounded, ovcate, more than half as long as the sliell. 



Succinea avara, Say, Long's Exped. ii. 260, pi. 15, fig. 6 (1822) ; Binney's cd. 32, pi. 

 74, fig. 6. — Gould, Inv. 196, fig. 127 (1841). — Adams, Vermont Moll. 156 (1842). 

 -De Kay, N. Y. Moll. 54, pi. 4, fig. 55 (184.3). — Pfeiffer, Symb. ii. 56 ; Mon. 

 Hel. Viv. ii. 525; in Chemsitz, 2d ed. 51, pi. 5, figs. 18-20 (18.54). — Binney, 

 Terr. Moll. ii. 74, i)l. 67 c, fig. 4. — W. G. Binney, Terr. Moll. iv. 35. — Morse, 

 Journ. Portl. Soc. i. 29, fig. 75; pi. 9, fig. 76 (1864) ; Am. Nat. i. 607, fig. 47 (1868). 



— Tryon, Am. Journ. Conch, ii. 2.33, pi. 2, figs. 11, 12 (1866). 



Succinea Wardiana, Lea, Proc. Am. Pliil. Soc. 1841, ii. 31 ; Tr. i.x. 3 ; Obs. iv. 3 (1844). 



— Pfeiffer, Mon. Hel. Viv. ii. 525. 



Succinea vermeta, Say, teste Gould (see doubtful species). — Tryon, Am. Journ. Conch, 

 ii. 233, pi. 2, fig. 10 (1866). 



Shell rather small, very thin and fragile, of a deep straw color ; 

 surface irregularly wrinkled ; whorls about three and a half, well 

 rounded, and separated by a deep suture, the last whorl 

 ^'"' '^'^' composing the greater part of the shell, but not very broad ; 

 aperture in adidt and elongated shells, about half as long as 

 the shell, but generally proportionally shorter, of a rounded 

 form, the curve of the outer lip, where it joins the preced- 

 ing whorl, being so great as to render the aperture nearly 

 as broadly rounded behind as in front. Length, seven twentieths 

 of an inch ; breadth, five twentieths of an inch ; divergence, fifty- 

 six degrees. 



A larger form is also found. 



Found about the margins of muddy streams, or sheltered under 

 loose objects lying about moist places. From Fort Simpson on 



