. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 198 TERRESTRIAL AIR-BREATHING MOLLUSKS. in the Central Province, in Nevada and Colorado. Its range in Europe is very great, being found from Siberia to Sicily, England, Iceland, etc. The shell is often met with an edentulate aperture. Such is the specimen figured in the second edition of Chemnitz. Jaw of American specimen slightly arched, concave edge waving; anterior surface striate. (See Fig. 100.) P. muscorum has 90 rows of 14—1—14 teeth, with 6 perfect laterals on its lingual membrane. (See Morse.) The figure and
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 198 TERRESTRIAL AIR-BREATHING MOLLUSKS. in the Central Province, in Nevada and Colorado. Its range in Europe is very great, being found from Siberia to Sicily, England, Iceland, etc. The shell is often met with an edentulate aperture. Such is the specimen figured in the second edition of Chemnitz. Jaw of American specimen slightly arched, concave edge waving; anterior surface striate. (See Fig. 100.) P. muscorum has 90 rows of 14—1—14 teeth, with 6 perfect laterals on its lingual membrane. (See Morse.) The figure and description of Lehmann of the European P. muscorum confirm my belief in the identity of the two forms. Fig. 101. Pupa blandi, Morse. Shell rimate, ovate-cylindrical, delicately striated, opaque, light brown ; apex obtuse, nucleus with microscopic granulations; suture well defined ; whorls G, 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). — Tkyon, 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(1850), no descr. ; L. & Sh., I. 235, Fig. 402 (1869). In drift on Missouri River, near Fort Rerthold, 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, cylindrieally ovate, thin, very delicately striated, horn- colored, shining, pellucid ; spire terminating in an obtu
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