ZONITES. 117 



imibilicMs nono, ])iit tho umbilical ri'iijion is indcntofl. Greater diameter 5, 

 lesser -U mill.; heiglit, 2\ mill. 



Jleiix indrnUita, Say, Journ. Acad, II. 372 (1822) ; Binney's cd., 24. — Binney, 

 Bost. .louni. Nat. llisl., 111. llf., IM. XXII. Vv^. 3 (1840); Terr. Moll., II. 

 242, ri. XXIX. Fig. 2. — DkKay, N. Y. Moll., 31, PI. III. Fi«. 26 (1843).— 

 Could, Invert., 181, Fig. 109 (1841). — Adamh, Vt. Moll., IGO (1842).— 

 Chemnitz, 2d ed., I. 21, Bl. XXXIV. Figs. 12-15. — Pfkiffer, Men. Hel. 

 Viv., I. 59. — Reeve, Con. Icon., 730 (1852). —W. G. Binney, Terr. Moll., 

 IV. 119. —Mouse, Amer. Nat., I. 413, Fig. 28 (1867). 



Hyalina indcntata, Mouse, Journ. Portl. Soc, 1. 12, Fig. 21, PI. II. Fig. 11 ; 

 PI. V. Fig. 22 (1864). — Tryon, Amor. Journ. Conch., II. 246, 411 (1866). — 

 W. Ct. Binney, L. & Fr.-W. Sh., I. 35, Fig. 45 (1869). —Gould and Binney, 

 Invert, of Mass., cd. 2, p. 398 (1870). 



Inhabits all of the Eastern Province, having been found from Canada to 



Texas, and from Dakota to Florida. Also the Central Province, having been 



* found in Utah, and I doubt not its eventually being found also over the Pacific 



Province, especially on the mountains. It is also said to occur in St. Domingo 



and Porto Rico. 



Animal bluish-black on the upper parts; margin and posterior extremity 

 lighter. A distinct caudal mucus pore. 



A variety with an open umbilicus is sometimes found (Fig. 33). 



Jaw somewhat arcuate, long, narrow, ends somewhat attenuated, ^^^ 



pointed ; concave margin smooth, with a slightly developed, broad , , 



median projection. 



Lingual membrane very broad, with 53 rows of 79 teeth each 

 (39 — 1 — 39) ; another membrane had 38 — 1 — 38, also with 3 per- 

 fect laterals ; centrals tricuspid, the median cusp very large and 

 longer than the base of attachment ; laterals 3 only on each 



. Z. indentatus, 



Side, bicuspid, arranged in a straight transverse row; marginals var. 

 aculeate (PI. III. Fig. G). 

 Genitalia not observed. 



Zonites limatulus, Ward. 

 Vol. in. PI. XXX. Fig. 3. 



Shell widely umbilicated, small, depressed, thin ; epidermis whitish, immac- 

 ulate ; suture distinctly impressed ; whorls more than 4, convex, with very 

 fine, oblique, parallel striae, which become obsolete on the base ; aperture 

 oblique, subcircular, slightly modified by the penultimate whorl ; peristome 

 thin, acute, its ends approaching ; umbilicus rounded, large, and deep, not ex- 

 hibiting all the volutions. Greater diameter 5|, lesser 5 mill. ; height, 2^ mill. 



Helix limatula, Ward, MSS. in Binney, Bost. Journ. Nat. Hist., III. 434, PI. 

 XXI. Fig. 2 (1840) ; Terr. Moll. U. S., II. 219, PI. XXX. Fig. 3. — Pfeiffeu, 

 Mon. Hel. Viv., I. 113; IV. 85. — W. G. Binney, Terr. Moll., IV. 100. 



