60 A MANUAL OF AMERICAN LAND SHELLS. 



VII.— DESCRIPTION OF SPECIES. 



a. Universally Distributed Species. 



Family LIMACID^. 



ZOI^lITES. (See below.) 



Zonites nitidns, Muller. 



Shell orbicular, depressed, moderately convex above and concave 

 Fig. 12. below, thin, shining, uniform brownish horn-color, with 

 delicate strise of growth ; whorls 5 or more, convex, sep- 

 arated by a deeply impressed suture, the outer one dispro- 

 portionately large, somewhat declining as it approaches the 

 aperture, and obtusely angular at the periphery, beneath 

 excavated around a broad, crateriform umbilicus, in which 

 z.nitidus. the whorls are displayed to the apex; aperture oblique, 

 lunate j peristome simple, its basal margin arcuate. Greater diameter 

 7^, lesser G'"'" ; height, Sf"™. 



Helix nitida, Muller, Hist. Verm., ii, 32, &c.— Pfeiffek, Mon., ii, 94. 



Helix lucida, Draparnaud, Moll. Fr., 103, pi. viii, figs, 11, 12.— Bixney, Terr. Moll., 



ii, 233, pi. xxii a, fig. 2.— W, G. Binney, Ter, Moll.,iv, 11(5. 

 Helix hydropliila, Ingalls iu coll., unpublished. 

 Hyalina niilda, Tkyon, Am. Jouru. Conch., ii, 250 (1866).— W. G. Binney, L. & Fr.- 



W. Sh., i, 31, figs. 35, 36 (1869). 

 Zonites nitidus, W. G. Binney. T. M. U. S.. v, 113. 



A European species. Found at Great Slave Lake, Fort Eesolu- 

 tion, in British America, and in ^STew York and Ohio. Also in Baldwin 

 County, Alabama. I believe, therefore, that it will be found to in- 

 habit all of the Eastern Province, if not the whole North American 

 continent ; also in Astoria, Oreg., which confirms this statement. It 

 is also found in Japan, and thus, like fulvus, may be considered one of 

 the circumpolar species common to the three continents. 



Jaw as usual in the genus. 



Lingual membrane : see Lehmann, Lebenden Schneckeu, &c., p. 72, 

 Plate X, Fig. 23, for description and figure of the European form. In 

 a specimen from Baldwin County, Alabama, I find 25-1-25 teeth, with 

 5 laterals (T. M., V, Plate III, Fig. A, the left-hand figure is an ex- 

 treme marginal). Lehmann gives 28-1-28. 



The specimen examined had the dart- sac and dart described in the 

 European form. 



