. Bulletin - United States National Museum. Science. EASTERN PROVINCE—INTERIOR REGION SPECIES. 205 The geuus Zonites being very numerous in species, it will be conven- ient to group the species in several subgenera, founded on the form of the shell. Subgenus MESOMPHIX, Raf. Shell umbilicated or perforated, globosely depressed, thin, striated, reddish horn-color, lighter below, shining; whorls 4^-6; aperture lunar-ovate; i)eristome simple, straight, acute, extremities approach- ing, that of the columella subreflexed. Animal (of Z. fuliginosus) nearly twice as long as the diameter of the shell,
. Bulletin - United States National Museum. Science. EASTERN PROVINCE—INTERIOR REGION SPECIES. 205 The geuus Zonites being very numerous in species, it will be conven- ient to group the species in several subgenera, founded on the form of the shell. Subgenus MESOMPHIX, Raf. Shell umbilicated or perforated, globosely depressed, thin, striated, reddish horn-color, lighter below, shining; whorls 4^-6; aperture lunar-ovate; i)eristome simple, straight, acute, extremities approach- ing, that of the columella subreflexed. Animal (of Z. fuliginosus) nearly twice as long as the diameter of the shell, blackish or bluish-black, the head, neck, and eye- peduncles. Eye-peduncles short in proportion to the length of the animal, and set widely apart. Respiratory foramen in the angle formed by the junction of the peristome with the body-whorl. Base of foot whitish, the locomotive band defined by two very fine lines or furrows. A double marginal furrow runs along the side of the foot from the head nearly to the posterior extremity, where it passes up- ward and joins that from the opposite side, leaving posteriorly a flattened, rounded extremity, somewhat prominent and glandular. Upon the center of the extremity is a longitudinal fissure or sinus, which is sometimes expanded and at other times closed and invisible. Secretion of mucus from the extremity profuse. Zonites capuodes, W. G. Binney. Shell depressed, horn-colored or smoky, globose, wrinkled, below smooth; si)ire short, depressed; suture mod- ^ig- 215. erate; whorls 5, rapidly increasing, the last very ventricose and large, sometimes marked with coarse revolving lines; aperture large, round; peristome simple, acute, ends ap- proached, joined by a slight deposition of brownish callus over the jjarietal wall, reflected zonites capiwdes. at the small and deep umbilicus. Greater diameter 35, lesser 28™™; height, 13™™. Helix Icopnodes, W. G. Binney, Proc. Acad. Nat. Sci. Philad., 1857, 186; Terr. Moll., iv, 1
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