AMERICAN SPECIES OF VERTIGO. 83 



five-toothed, of which three are situate on the transverse por- 

 tion of the lip, parallel to each other, equidistant, the superior 

 and inferior ones being small, the latter sometimes obsolete, 

 the intermediate one lamelliform, prominent, and the two 

 others situate on the columella, approximate, extending at 

 right angles to the three preceding ones, the superior one 

 oblique and smaller; labrum reflected but not flattened, bi- 

 dentate, teeth lamelliform, prominent; umbilicus distinct. 

 Length less than one-tenth of an inch. Breadth nearly 1/20 

 inch" (Say). 



Length 2.2, diam. 1.4 mm. ; 5 whorls (Dutchess Co., N. Y.). 



Length 2.3, diam. 1.4 mm. (Ottawa, Canada). 



Length 2.15-2.35, diam. 1.35 mm. (Oswego, Ore.). 



Labrador and Alaska, south to Alabama, Texas and 

 Arizona ; State of Vera Cruz, Mexico and West Indies. Type 

 loc. Philadelphia. 



Vertigo ovata SAY, Journ. A. N. S. Phila. ii, 1822, p. 375. 

 BINNEY, Man. Amer. Land Shells, 1885, p. 334, f. 362, 363. 

 MORSE, Amer. Nat. i, 1868, p. 668, f. 67, 68. TAYLOR, Nautilus 

 v, 91 (Vancouver I.). WEBSTER, Naut. v, 119 (Florida). 

 STUPAKOFF, Naut. vii, 135 (Allegheny Co., Pa.). PLEAS, 

 Naut. vii, 68 (Henry Co., Ind.). SQUYER, Naut. viii, 63 

 (Mingusville, Mont.). PRIME, Naut. viii, 70 (Long Island, 

 N. Y.). STERKI Proc. U. S. N. M. xi, 1888, p. 375, pi. 42, f. 

 5-7; Naut. viii, 89 (Kent Co., Mich.) ; ix, 116 (San Marcial, 

 N. M.); xxix, 123 (Geneva, O.). SCHICK, Naut. viii, 137 

 (Philadelphia). SARGENT, Naut. ix, 89 (Clearwater, Minn.). 

 HANHAM, Naut. x, 101 (Quebec); xiii, 3 (Winnepeg). 

 PILS. & CKLL., Naut. xiv, 86 (Las Vegas, N. M.). COCKERELL, 

 Naut. x, 41-43 (Mesilla, near Silver City and Eincon, N. M.) 

 Chadwick, Naut. xix, 58 (near Milwaukee, Wis.). PILSBRY, 

 Naut. xix, 130 (Grant, N. M.) ; xxv, 75 (Monroe Co., Pa.). 

 WALKER, Naut. xx, 81 (Monroe canyon, Neb.) ; Moll, of 

 Michigan, 1906, p. 516, fig. 148 (entire state). SMITH, Naut. 

 xx, 90 (Otsego Co., N. Y.). WHEAT, Naut. xx, 101 (Cayuga 

 Lake, N. Y.). HANNA, Naut. xxiii, 95 (Douglas Co., Kansas). 

 NYLANDER, Naut. xxii, 143 (Aroostook Co., Me.). HENDER- 

 SON, Naut. xxii, 9 (Amarillo, Texas). PILSBRY & 



