ZONITES. 117 



umbilicus none, but the umbilical region is indented. Greater diameter 5, 

 lesser 4^ mill. ; height, 2^ mill. 



Helix indentata, SAY, Journ. Acad., II. 372 (1822) ; BINNEY'S ed., 24. BINNEY, 

 Bost. Jcmrn. Nat. Hist., III. 415, PI. XXII. Fig. 3 (1840) ; Terr. Moll., II. 

 242, PI. XXIX. Fig. 2. DEKAY, N. Y. Moll., 31, PI. III. Fig. 26 (1843).- 

 GOULD, Invert., 181, Fig. 109 (1841). ADAMS, Vt. Moll., 160 (1842).- 

 CHEMNITZ, 2d ed., I. 21, PL XXXIV. Figs. 12-15. PFEIFFER, Mon. Hel. 

 Viv., I. 59. REEVE, Con. Icon., 730 (1852). W. G. BINNEY, Terr. Moll., 

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



Hyalinn indentata, MORSE, Journ. Portl. Soc., 1. 12, Fig. 21, PL II. Fig. 11 ; 

 PL V. Fig. 22 (1864). TRYON, Amer. Journ. Conch., II. 246, 411 (1866). - 

 W. G. BINNEY, L. & Fr.-W. Sh., I. 35, Fig. 45 (1869). GOULD and BINNEY, 

 Invert, of Mass., ed. 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 tipper 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.iniientatus, 



side, bicuspid, arranged m a straight transverse row; marginals Tar. 



aculeate (PL ILL Fig. G). 

 Genitalia not observed. 



Zonites limatulus, WARD. 

 Vol. III. PL 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 stria;, 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. 1 . mill. 



Helix limatula, WARD, MSS. in BINNEY, Bost. Journ. Nat. Hist., III. 434, PL 

 XXI. Fig. 2 (1840) ; Terr. Moll. U. S., II. 219, PL XXX. Fig. 3. PFEIFFER, 

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



