PUPILLA, AMERICAN. 157 



rest of the shell, and the lip-callus is much thinner, pi. 18, 

 figs. 15, 16 (Mt. Desert, Maine). In either form the parietal 

 tooth may occur, but the palatal tubercle is developed only 

 in moderately thick-lipped shells. 



Length 3.4 mm., diam. 1.6 mm. Thomaston, Maine. 



Length 3.15 mm., diam. 1.55 mm. Thomaston, Maine. 



Length 4 mm., diam. 1.7 mm. Mt. Desert, Maine. 



Length 3.25 mm., diam. 1.65 mm. Mt. Desert, Maine. 



Length 3.35 mm., diam. 1.73 mm. Rochester, N. Y. 



Length 3.5 mm., diam. 1.65 mm. Duxbury, Mass. 



Length 3 mm., diam. 1.7 mm. Duxbury, Mass. 



Eastern North America from Anticosti Island south to 

 Atlantic City, New Jersey, westward in Canada and the 

 northern tier of states; south in the Rocky Mountain region 

 through Colorado to Socorro Co., New Mexico, and northern 

 Arizona ; north to Anuk, Alaska. Loess of Iowa and Kansas. 



Pupa muscorum BINNEY, Man. Amer. Land Sh., 1885, p. 

 78. PILSBRY and COCKERELL, Nautilus, v, p. 45 (varieties). 

 BLANEY, Naut., xviii, pp. 45, 46 (Ironbound I., Me.). Pupilla 

 muscorum L., WHITEAVES, Ottawa Naturalist, 1905, p. 171 

 (Anticosti; Cypress Hills, Assiniboia). HANNA, Nautilus, 

 vol. 23, p. 94 (Lawrence, Douglas Co., Kansas, in river drift). 

 PILSBRY, Nautilus, vol. 19, p. 130 (Grant, Valencia Co., N. 

 M.) ; Proc. A. N. S. Phila., 1906, p. 143 (Benson, Ariz., river 

 drift). J. HENDERSON, Univ. of Colo. Studies, ix, p. 57 (Tol- 

 land, Ckll. ; Eldora, Henderson) ; Nautilus, xxvii, p. 38 (Clear 

 Creek, Johnson Co., Wyo.). COCKERELL, Naut., xxv, p. 59 

 (Tolland, Colo.). NORTON, Naut., xxi, p. 6 (Manticus Is., 

 Me.; 3 mm. long; three out of four taken opaque white). 

 DALL, Harriman Alaska Exped., Moll., p. 28 (Laggan, Al- 

 berta ; Anuk, Alaska) . 



Pupa badia C. B. ADAMS, Boston Journ. N. H., iii, 1840, p. 

 331, pi. 3, f. 18 (Crown Point, N. Y.). Pupilla badia Ad., 

 MORSE, Journ. Portland Soc. N. H., i, 1864, p. 37, f. 89-91, pi. 

 10, f. 92. Pupilla muscorum xerobia Pils., Nautilus, vol. 28, 

 p. 38, pi. 2, figs. 1, 2. Henderson, Univ. of Colo. Bull., xv, p. 

 250 (Magnolia, Estes Park, Black Lake Creek, and near Gol- 

 den, Colo.) ; Univ. of Colo. Studies, ix, 57 (Floyd Hill, Clear 

 Creek Co., Hand; Eldora, Lake Co., Bethel). 



