. Bulletin - United States National Museum. Science. 182 A MANUAL OF AMERICAN LAND SHELLS. acute, its columellar extremity not reflected. Greater diameter, 2^™°^; height ^™™. Helix exigua, Stimpson, Proc. Bost. Soc, iii, 175 (1850).—Gould, T. M.,iii, 16.—W. G. BiNNEY, T. M., iv, 102, pi. Ixxvii, fig. 19.—Pfeiffer, Mon, Hel. Viv., iii, 102.—Mouse, Amer. Nat., i, 543, iig. 34 (1867). Helix annulafa, Case, in Sill. Journ. [2], 1847, iii, 101, figs. 1-3; Ann. and Mag. Nat. Hist., 1847, 338, preocc*—Pfeiffer, Mod., iii, 103. Helix striatella, junior, teste Gould, Sill. .Joiiru., iii, 276 (1847). Ps
. Bulletin - United States National Museum. Science. 182 A MANUAL OF AMERICAN LAND SHELLS. acute, its columellar extremity not reflected. Greater diameter, 2^™°^; height ^™™. Helix exigua, Stimpson, Proc. Bost. Soc, iii, 175 (1850).—Gould, T. M.,iii, 16.—W. G. BiNNEY, T. M., iv, 102, pi. Ixxvii, fig. 19.—Pfeiffer, Mon, Hel. Viv., iii, 102.—Mouse, Amer. Nat., i, 543, iig. 34 (1867). Helix annulafa, Case, in Sill. Journ. [2], 1847, iii, 101, figs. 1-3; Ann. and Mag. Nat. Hist., 1847, 338, preocc*—Pfeiffer, Mod., iii, 103. Helix striatella, junior, teste Gould, Sill. .Joiiru., iii, 276 (1847). Pseudohyalina exiqua, Morse, Jonrn. Portl. Soc, i, 16, pi. ii, fig. 8; pi. vii, fig. 33 (1864).—Tryon, Amer. Jonrn. Conch., ii,265, pi. iv, fig. 57 (1866). Hyalina exicjua, W. G. Binney, L. &. Sh., i, 42 (1869).—Gould and BiNNEY, Invert, of Mass., ed. 2, 400 (1870). Zonites exiguus, W. G. Binney, Terr. Moll., v, 122. A species of the Kortheru Region, noticed hitherto in Canada, New York, and 'New England; Tawas Bay, Michigan. Fig. 178 shows the peculiar sculpturing of this species. Tig. 178. Jaw very low, wide, but slightly arcuate; no median prominence to the cutting margin. The lingual membrane has G9 rows of 16-1-lC teeth each; centrals with one long, slender, middle, and two short side cusps; laterals 4, of same shape, but bicuspid; marginals aculeate, diminishing greatly in size as they Surlace of pass otf laterally. The transition teeth and several of the adjoining marginals are described by Morse witli a small side spur to their cusps, apparently of the same type as I have figured for MacrocycUs Vancouverensis (Terr. Moll., Y, Plate I, Fig. B). On Plate III, Fig, D, I give a drawing of a specimen examined by me. I found 16-1-16 teeth, with 5 laterals. Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustratio
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