. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 370 TERRESTRIAL AIR-BREATHING MOLLUSKS. The epiphragm is thick, white, parchment-like. Jaw as usual in the genus; 8 ribs. Lingual uienibrane (PI. IX. Fig. M) has 36—1—36 teeth; the thirteenth tooth has the side cutting ix)int; 16 laterals. The genital system resembles very nearly that of Nickliniana. Tlie duct of the genital bladder in this species is, however, very much longer, its accessory duct shorter in proportion, the llagellum of the penis sac longer. There is also a peculiar feature in the genitalia o
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 370 TERRESTRIAL AIR-BREATHING MOLLUSKS. The epiphragm is thick, white, parchment-like. Jaw as usual in the genus; 8 ribs. Lingual uienibrane (PI. IX. Fig. M) has 36—1—36 teeth; the thirteenth tooth has the side cutting ix)int; 16 laterals. The genital system resembles very nearly that of Nickliniana. Tlie duct of the genital bladder in this species is, however, very much longer, its accessory duct shorter in proportion, the llagellum of the penis sac longer. There is also a peculiar feature in the genitalia of Traski, a globular organ (probably a dart sac) of about equal diameter with the vaginal prostate, attached laterally to the llagellum of the latter, before it becomes bifurcated. The bulbous expan- sions on the two branches of the flagellum are also much larger in Traski. It is figured in PI. XIII. Fig. H. Arionta Dupetithouarsi, Deshayes. Shell umbilicated, orbicularly convex, smooth or substriate, dark chestnut, lio-hter above, with a dark red, white-margined band; Fie 252 o ' / tj ^^^ " spire obtusely conoid; whorls 7 to 8, narrow, rather convex, the last inflated; aperture ovate semilunar, white, and banded within; peristome simple, nar- rowly reflected, its columellar end arched, dilated and arched above, not covering the moderate um- bilicus. Greater diameter 29, lesser 25 mill.; height, A. Dupetithouarsi. 17 mill. Helix Ihipetithanarm, Deshayes, Rev. Zool., 1839, 360 ; in Gueein, Mag. 1841, Tab. XXX ; in F^r., I. 169, PI. XCVII. Figs. 8-10. — Pfeiffer, Mon. Hel. Viv., I. 338, excl. var. ; III. 229 ; in Chemnitz, ed. 2. I. 328, PI. LVIII. Figs. 6-7 (not PI. LVI. Figs. 3-5). — Reeve, Con. Icon., 659. — Gould, Te!rr. Moll., III. 14.— W. G. Binney, Terr. Moll., IV. 15, PI. LXXVI. Fig. 9 ; Pac. R. R. Rep., VI. 114 (1857); L. & Sh., I. 174 (1869). Helix Oregoncnsis, Lea, Trans. Am. Philo. Soc, VI. 100 (1839) ; Obs., II. 100, PI. XXVIII. Fig. 9; Tr
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