Z0NITES. 



119 



rounded; concave margin smooth, with a slightly developed, broad, median 

 projection. 



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

 erals. He counted 52 rows of 12 1 12 teeth. It will be noticed that his 

 figure does not show the cutting points of the side cusps of the central and lat- 

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

 found a similar number of teeth. 



Fig. 34. 



Zoiiites milium, MORSE. 



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

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

 scopic revolving lines, the latter more conspicuous beloAv ; 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, 



i O ' 



mill. 



Z. milium, 

 enlarged. 



Helix, milium, MORSE, Proc. Bost. Soc., 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 milium, 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. 



Linguiil Dentition of Z. milium. 



