t 



ZONITKS. 



119 



rounded ; concave margin smooth, with a sli^lilly developed, broad, median 

 projection. 



Lingual membrane (PI. III. Fig. II). Morse's figure shows 4 perfect lat- 

 erals, lie counted 52 rows of 12 — 1 — 12 teeth. It will be noti(;ed that his 

 figure does not show the cutting points of the sid(; cus[)S of the cc^ntral and lat- 

 eral teeth, which I have found in specimens lately examined from Florida. I 

 found a similar number of teeth. 



Fig. .34. 



Zonites militim, Morse. 



Shell widely umbilicated, depressed, transparent, shining, white, with a 

 greenish tinge, marked with distinct and regular striae of growth and micro- 

 scopic revolving lines, the latter more conspicuous below ; spire 

 but slightly elevated ; whorls 3, rounded, rapidly increasing, 

 the last planulate above, widely umbilicated below; aper- 

 ture very oblique, subcircular, remote from the axis ; peristome 

 simple, acute, its terminations somewhat approached, that of 

 the columella not reflected. Greater diameter 1^ mill.; height, 

 ^ mill. 



Z. milium, 

 enlarged. 



Helix milium, Morse, Proc. Best. Sec, VII.: 28 (1859). — W. G. 



BiNNEY, Terr. Moll., IV. 101. PI. LXXIX. Figs. 4, 5.— Morse, 



Amer. Nat, I. 543, Fig. 36 (1867). 

 Striatura milium, Morse, Journ. Portl. Soc, I. 18, Figs. 41, 42, PI. VII. Fig. 



43 (1864). 

 Pseudohyalina viilium, Tryon, Am. Journ. Conch., II. 265 (1866). 

 Hyalina milium, W. G. Binney, L. & Fr.-W. Sh., I. 38 (1869). —Gould and 



BiNNEY, Inv. of Mass., ed. 2, 401 (1870). 



Massachusetts and Maine ; Campbell County, Kentucky. It has also been 

 noticed in Monterey, near San Francisco, and Nevada County, California. I 

 doubt not that it will be found over the whole continent. 



Fig. 35. 



Lingual Dentition of Z. miiiitTH. 



