AMERICAN SPECIES OP VERTIGO. 147 



aperture half the width of the last whorl, heart-shaped, the 

 apex being at the right posterior angle ; the transverse margin 

 is nearly direct; the outer lip is scalloped by an indentation 

 of the lip ; the remainder of the margin is regularly arcuated ; 

 lip white, slightly everted ; throat with six teeth, two of which 

 are on the transverse lip, equidistant ; one, with a tubercle at 

 its base, is on the middle of the columella, and nearly at right 

 angles with the preceding, and is the largest; a fourth is on 

 the indenture of the outer lip, directed between the two on 

 the transverse lip ; and two smaller ones, more retired within 

 the shell, are equidistant between the two last mentioned; 

 umbilicus large and deep. Length less than 1/30 of an inch : 

 breadth 1/40 of an inch" (Gould). 



Maine to Florida, west to South Dakota, Grand County, 

 Colorado and southeastern Arizona; Tampico, Mexico; 

 Jamaica. Type locality Oak Island, Chelsea, near Boston. 



Pupa milium GOULD, Boston Journal of Natural History 

 iii, pt. 3, 1840, p. 402, pi. 3, f . 23 ; iv, p. 359, 1843 ; in Binney, 

 Terr. Moll, ii, p. 337, pi. 71, f . 1 ; Invert. Mass. p. 187, f . 118. 

 ADAMS, Vermont Moll., p. 157. Vertigo milium Gld., W. G. 

 BINNEY, Terr. Moll, v, 1878, p. 215, pi. 71, f. 1 ; Man. Amer. 

 Land Shells, 1885, p. 332, f. 361. MORSE, Amer. Nat. i, 1868, 

 p. 669, f. 65, 66. STERKI, Proc. U. S. Nat. Mus. xi, 1888, p. 

 377, pi. 42, f. 10, 13; Nautilus xxix, 123 (Geneva, 0.). 

 WALKER, Moll, of Michigan, 1906, p. 515, f. 146, 147 (Newaygo, 

 Kent, Bay, Oakland, Washtenaw and Lenawee counties) ; Nau- 

 tilus xxxi, 54, 56 (Chester Shoals and Palm Beach, Fla.). 

 JOHNSON, Fauna of New England 13, 1915, p. 215 (Me., 

 Vt., Mass.). DANIELS, 27th Ann. Rep. Dep. Geol. and Nat. 

 Res. Indiana, 1902, p. 632 (Steuben Co., Brookville, Lawrence- 

 burg, Dunreith, Ind.). OVER, Nautilus xxix, 91 (Chamber- 

 lain, Brule Co., S. Dak.). VANATTA, Naut. xxviii, 11 (Sussex 

 Co., N. J.). PILSBRY, Nautilus xiv, 74 (Cape May, N. J.) ; 

 xxv, 35 (Atlantic City, N. J.). HANNA, Nautilus xxiii, 95 

 (Douglas Co., Ks.). HINKLEY, Nautilus xxi, 77 (Tampico). 

 HANHAM, Nautilus x, 101 (Quebec). CHADWICK, Nautilus 

 xix, 58 (near Milwaukee). CKLL., Nautilus iii, 21 (Kremm- 

 ling, Colo.). SMITH, Nautilus xx, 90 (Otsego Co., N. Y.). 



