. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 3C6 TERRESTRIAL AIR-BREATHING MOLLUSKS. One lingual membrane had 176 rows of 56—1—56 teeth eacli. Another membrane (1*1. IX. Fig. S) had 53—1—53 teeth. All the teeth are as usual in the genus. The central and fir»t laterals have no distinct side cusps or cut- ting points, though the latter are represented by lateral bulgings on the large cutting point. The side cutting points and cusps are distinctly developed on the ninth tooth. There are about 24 laterals, tlic inner cutting point of the twenty-fifth tooth
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 3C6 TERRESTRIAL AIR-BREATHING MOLLUSKS. One lingual membrane had 176 rows of 56—1—56 teeth eacli. Another membrane (1*1. IX. Fig. S) had 53—1—53 teeth. All the teeth are as usual in the genus. The central and fir»t laterals have no distinct side cusps or cut- ting points, though the latter are represented by lateral bulgings on the large cutting point. The side cutting points and cusps are distinctly developed on the ninth tooth. There are about 24 laterals, tlic inner cutting point of the twenty-fifth tooth being bifid. The thirty-ninth and fifty-third (and last) teeth shown in the plate are true marginals. The genitalia are as in A. Nickliniana. Arionta Carpenteri, Np:wcomb. Shell umbilicated, roundly conical, apex obtuse, obscurely marked with one brown band, well striated, under the lens numerous • Fig. 247. very minute spiral striations; whorls 5|, rounded; suture well marked; aperture circular, with terminations approxi- mating; peristome moderately expanded, at the columella broadly so, but not adherent. Greater diameter, 23 mill.; height, 16| mill. (Newcomb.) Helix Carpenteri, Newcomb, Proc. Cal. Acad. Nat. Sci., (March, 1861), II. 103. Aglaja Carpenteri, Tryon, Am. Joum. Conch., II. 313(1866). Helix Kemondi, Tryon, Proc. Acad. Nat. Sci. Philad., 1863, 281, PI. II. Fig. 1. A. Carpenteri. Arionta Remondi, Tryon, Am. Joum. Conch., II. 318, PI. V. Fig. 18 (1866). Cinaloa; Trinidad; Coronado Island, Lower California; San Diego and Tulare Valley in the California Region. (Newcomb.) The shell figured was received from Dr. Newcomb. Jaw as usual; over 7 ribs. Lingual membrane long and narrow. Teeth 48—1—48, with 20 laterals. (See PI. IX. Fig. U.) It will be seen that the central and first lateral teeth have no side cusps or cutting points; they appear first on the eighth tooth. The change from laterals to marginals is formed as usual, the inner cutting point of the t
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