. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 290 TERRESTRIAL AIR-BREATHING MOLLUSKS. Helix pohjijyrella. Bland & Cooper, Ann. N. Y. Lye, VII. 365, PI. IV. Figs. 13-15 (1861). — W. G. BiNNEY, L. k Sh., I. 112 (1869). Polygyra polygyrella, Tryon, Am. Journ. Concli., 111. 160 (1867). Central Province. Common on the Coeur d'Alene Mountains, especially on their eastern slope, in spruce forests. Jaw and lingual membrane (see p. 289). Genitalia unknown. STENOTREMA, Raf. Animal heliciform, mantle subccntral; other characters as in Patula. Shell with
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 290 TERRESTRIAL AIR-BREATHING MOLLUSKS. Helix pohjijyrella. Bland & Cooper, Ann. N. Y. Lye, VII. 365, PI. IV. Figs. 13-15 (1861). — W. G. BiNNEY, L. k Sh., I. 112 (1869). Polygyra polygyrella, Tryon, Am. Journ. Concli., 111. 160 (1867). Central Province. Common on the Coeur d'Alene Mountains, especially on their eastern slope, in spruce forests. Jaw and lingual membrane (see p. 289). Genitalia unknown. STENOTREMA, Raf. Animal heliciform, mantle subccntral; other characters as in Patula. Shell with the perforation covered, lenticular or globosely depressed, hairy; •whorls 4^ - 6, the last anteriorly gibbous, shortly deflexed, tumid below ; spire somewhat elevated ; peristome with a white, thickened margin, briefly reflexed above, somewhat constricted in its basal portion, usually sinuous and dentate, furnished with an internal transverse tubercle on the floor of the base of the last whorl. A North American genus, meeting its greatest development in the Cumber- land Subrc<xion. Jaw thick, high, arched; ends but little acuminated, blunt; cutting margin without median projection ; anterior surface with stout, broad, crowded ribs, denticulating either margin. There are about 8 in Fig. 188. stenotreynum, 11 in germanum^ 7 in moriodoiiy 8 in Mr- sutxim^ 13 in Edvardsi, 12 in harbigerum, 8 in spino- siiniy 12 in labrosum. I have had no opportunity of examining Edgarlanum Jaw of 5^. nionodon (Morse). or maxiliatum. The subgenus is restricted to North America as far as known. It d-fTers from our other subgenera in having its ribs much broader and much more closely crowded. Lingual membrane arranged as in Patula. Centrals with a base of attach- ment longer than wide, the lower lateral angles but little expanded, the lower margin incurved, the upper margin squarely reflected ; reflection large, wide, with small, in some species almost obsolete, side cusps, always bearing dist
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