242 



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



mate whirl, and runs backward and downward into the aperture, it is promi- 

 n«it, iamelliforui, irregular, has one or more sharp, projecting points, and 

 is sometimes bifid ; another, thick and massive, is situated deep in the 

 throat, and marks internally the place of the umbilicus ; and two others, 

 projecting and tooth like, are placed on the peristome at the base of the 

 aperture, and point towards the centre of the aperture ; base of the shell, 

 from the umbilicus to the edge of the aperture, compressed, forming a 

 short and obtuse keel ; umbilicus a little expanded, and slightly perforate. 

 Length 45 mill., diam. 2g ; length of aperture I5. 



Pupa armifera, Say, Jonrn. Acad. Nat. Sci. Philad. II, 1G2 (1821) ; Bin- 

 ney's ed. 21. — Gould, Bost. Journ. Nat. Hist. Ill, 400, pi. iii, f. 10 

 (1840); IV, 359 (1843).— Adams, Vermont Mollusca, 157 (1842); 

 Silliman's Journ. [i], XL, 271. — Pfeiffer, Symbolse, II, 53 ; Mon. 

 Hel. Viv. II, 357.— DeKay, N. Y. Moll. 52 (1843).— Binney, Terr. 

 Moll. II, 320, pi. Ixx, f. 4.— KiJsTER, in Chemnitz, ed. 2, 57, pi. vii, 

 f. 17-19.— W. G. Binney, Terr. Moll. IV, 142. 



Pupa rupicola, Pfeiffer, Symbolae, II, 55, teste Pfeiffer, in Mon. 



Leucochila armiferci, Morse, Amer. Nat. 667, f. 55 (1868). 



Pupa armigera, Potiez et Michaud, Galerie, I, 159, pi. xvi, f. 1, 2. 



Probably inhabits every State east of tlie Rocky Mountains. 



Locality. 



Kansas. 



Columbus, Ohio. 

 Marietta, Ohio. 

 Milwaukee, Wi.s. 

 Washiugton, D. C. 



From whom received. 



Dr. .T. Lewis. 

 W. Holdeii. 

 \. A Lapliam. 

 VV. StimpsoQ. 



Pupa contracta, Say. — Shell subconical; epidermis whitish horn- 

 color; whirls between five and six, very convex, diminisliing regularly 

 from the last whirl, which is somewhat ventricose, to the apex ; suture 

 well impressed ; peristome white, thickened, somewhat reflected, its ex- 



Fig. 420. 



Fig. 421. 



^fl\%| 



Pupa contracta. Say. 



tremities connected by a raised, testaceous fold, making the margin of the 

 aperture entire ; aperture lateral, rather triangular or trilobate, more than 



