294 



LAND AND FRESH- WATER SHELLS OF N. A. [PART I. 



Helix sxippressa, Say, New Harm. Diss. 11,229 (1829); Descr. 14; Bi-\- 

 ney's ed. 36. — Binsey, Bost. Journ. Nat. Hist. HI, 410, pi. xi, f. 3; 

 Terr. Moll. H, 253, pi. xxxvii, f. 1.— DeKay, N. Y. Moll. 3S, pi. iii, 

 f. 24 (1843).— Reeve, Con. Icon. 723.— W. G. Bi.xney, Terr. Moll. 

 IV, 122.— MoKSE, Auier. Nat. I, 411, f. 25 (1867).— Pfeiffeb, Mon. 

 Hel. Viv. IV, 153. 



nelix gularis, var. 3, Pfeiffer, in Chemnitz, ed. 2, &c. See Z. cjularis. 



Gastrodonta suppressUy Tryon, Am. Journ. Conch. II, 258, pi. iv, f. 41 

 (1866). 



Fig. 528. 



Animal (see p. 292). 



Jaw strongly arcuate, ends rounded, anterior surface 

 striated ; concave margin smooth, with a stout, rounded, 

 blunt, median projection. 



From Florida to New Encrland. 



Cat No.JNo.ofSp. 



7543 

 8.586 

 87.18 

 8787 



Locality. 



Washincton, D. C. 

 Peimsylvania. 

 Western States. 

 Ohio. 



From whom locpiveil. 



W. S'tirnjoon. 

 W. G. Buiuey. 

 W. SlimpsDu. 



B. Mantle covering the whole of the bacJc. Respiratori/ chamf>er fmnU, thin, 

 in the front of the bach/, separate from the mantle, Heiid without anij 

 grooves. Eye-peduncle and tentacle distinct. 



Family PHILOMYCID^. 



Lingual membrane very broad, teeth uniform, in numerous 

 close, straight, transverse rows, the central large, obtusely 

 conical, broad, laterals the same, the inner ones surmounted 

 by a pointed apex. 



Jaw horny, arcuate, strongly striated, its extremities blunt, 

 concave margin irregular, scarcely bluntly projecting in the 

 centre, vertically convex in the middle. 



Animal limaciform, elongated, tapering behind. Eyes at 

 the end of retractile cylindrical peduncles; tentacles short. 

 Mantle thin, large, entirely covering the back. Eespiratory 

 orifice on the right side near the head, above the edge of the 

 mantle. Foot narrow, elongate, simple posteriorly, extending 

 beyond the mantle; no locomotive disk. Vent a little abova 



