EASTERN PROVINCE NORTHERN REGION SPECIES. 183 



Zoiiites niiiltidcntatus, Binnby. 



Shell umbiiicated, depressed, subplanulate above, very thin, pellucid; 

 epidermis smooth, shining; whorls G, narrow, slightly con- fig. iso. 

 vex, increasing but slowly in diameter, delicately striated, 

 beneath smoother; suture impressed; aperture semilunate, 

 narrow; peristome acute; umbilicus very small, rounded, 

 ])ervious; base convex, indented around the umbilicus; 

 two or more rows of very minute, white teeth, radiating 

 from the umbilicus, are seen through the shell, within the 

 base of the last whorl. Greater diameter 3^, lesser a-^'"; ^""eidargeci!'"*' 

 height, 1^""". 



Helix muliidentata, Binnet, Bost. Jouru. Nat. Hist., iii, 42.^), pL xxii, fig. 5 (1840); 

 Terr. Moll., ii, 2.58, pi. xlviii, fig. 3. — Adams, Yermout Mollusca, 161 (1842). — 

 Chemnitz, eel. 2., ii, 201, pi. ci, figs. 9-12. — Pfeiffer, Mod. Hel. Viv., i, 184. — 

 W. G. BiNNEY, Terr. Moll., iv, 123. — Reeve, Con. Icon., No. 729. — Morse, 

 Amer. Nat., 1, 543, fig. 33 (1867). 



Uyalina mnltidentata, Morse, Journ. Portl. Soc, i, 15, fig. 31; p. 61. fig. 30; pi. vi, fig. 

 32 (1864).— W. G. BiNNEY, L. &. Fr.-W. Sh., i, 50, fig. SO (1869),— Gould and 

 BiNNEY, Inv. of Mass., ed. 2, p. 404 (1870). 



Gastrodouta multidentafa, Tryon, Am. Joarn. Conch., ii, 258 (1866). 



Zonites multidentatus, W. G. Binney, Terr. Moll., v, 133. 



A species of the Northern Eegion, noticed in Maine, Vermont, New 

 York, Ohio; also Lower Canada. 



For a figure of the rosy- white, thread-like animal, see Boston Journ. 

 Nat. Hist., Ill, Plate XXII, Fig. 5. 



This species possesses characters so marked tliat it at first is not 

 likely to be mistaken for any other. The numerous narrow whorls 

 visible on its upper and plane surface, while only one is seen below, to- 

 gether with its minute, round umbilicus and narrow aperture, would 

 sufficiently distinguish it; but there is another still more peculiar 

 character. There are from 2 to 4 rows of very minute, delicate white 

 teeth on the lower side of the interior of the last whorl, radiating from 

 the center. One row is usually so near the aperture as to be seen 

 within it with the aid of a microscope ; the others are more or less re- 

 mote; each row contains from 5 to 6 distinct teeth. They are visible 

 through the shell. The transparency of the shell is so great that fre- 

 quently the sutures of the upper surface can be seen through it when 

 viewed on the base, With the living animal within, the shell has a, 

 roseate tinge. 



