198 



TERRESTRIAL AIR-BREATHING MOLLUSKS. 



in the Central Province, in Nevada and Colorado. Its rannje in Europe is very- 

 great, being found from Siberia to Sicily, England, Iceland, etc. 



The shell is often met vfith an edentulate aperture. Such is the specimen 

 fio-ured in the second edition of Chemnitz. 



Jaw of American specimen slightly arched, concave edge waving ; anterior 

 surface striate. (See Fig. 100.) 



P. inuxcorum has 90 rows of 14 — 1 — 14 teeth, with 6 perfect laterals on its 

 linorual membrane. (See Morse.) The figure and description of Lehmann of 

 the European P. muscorum confirm my belief in the identity of the two forms. 



Fisr. 101. 



Pupa blandi, Morse. 



Shell rimate, ovate-cylindrical, delicately striated, opaque, light brown ; apex 

 obtuse, nucleus with microscopic granulations ; suture well defined ; whorls 6, 



subconvex, the last ascending at the aperture, rap- 

 idly expanding, with an external whitish callus, 

 between which and the peristome there is a deep 

 constriction ; aperture small, nearly circular, with 3 

 obtuse teeth of about equal size, one on the pa- 

 rietal margin, one on the columellar margin, and 

 the third far within and at the base of aperture ; 

 peristome subreflected, the margins joined by a 

 thin callus. Length, .13 inch, breadth, .06 inch. 

 (Morse.) 



Pupilla Blandi, Morse, Ann. N. Y. Lye, VIII. 211, 



Fig. 8 (Nov., 1865). — Tryon, Am. Journ. Conch. 



III. 303 (1868). 

 Pupa Blandi, W. G. Binney, Expl. in Nebraska, 



Ex. Doc. 25th Congress, 2d Sess., II. part 2, p. 



725(1859), no descr. ; L. & Fr.-W. Sh., I. 235, 



Fig. 402 (1869). 



In drift on Missouri River, near Fort Berthold, and 

 in Dakota and Colorado. It is evidently a species 

 of the Northern Region, but extending into the 

 Central Province on the mountain-ranges. 

 Animal unknown. 



Pupa Hoppii, Moller. 

 Shell subperforate, cylindrically ovate, thin, very delicately striated, horn- 

 colored, shining, pellucid ; spire terminating in an obtuse cone ; whorls 5, rather 

 convex, the last scarcely equalling two fifths the shell's length, ascending above, 

 somewhat narrowed towards the base; columella deeply subplicate, parietal 

 wall of the aperture furnished with one tooth-like callus; aperture vertical, 

 subsemicircular ; peristome thin, scarcely expanded, its right termination quite 

 arched. Length, 2| mill.; diameter, 1 mill. 



Pitpa Blandi, 

 enlarged. 



