118 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Pseudohyalina limatula, Tryon, Amer. Journ. Conch., II. 264 (1866). 

 Hyalina limatula, W. G. Binney, L. & Fr.-W. Sh., I. 36 (1869). 



I have actually received specimens from New York to Michigan, and from 

 San Mateo, CaUfornia. I believe it will prove, therefore, to have as wide a 

 distribution as many of the other minute species. 



The animal has the longitudinal furrows along the side, above the foot, and 

 the caudal mucus slit, as in Zonites sitppressus. In two individuals examined 

 I found the sac and dart as figured by Leidy in Z. Ugerus (Vol. I. PI. XII. 

 Fig. 3). 



Jaw as usual in the genus. 



The lingual membrane (PI. II. Fig. N) has 23 — 1 — 23 teeth, with 5 laterals. 



Zonites minusculus, Binney. 

 Vol. III. PI. XVII. Fig. 2. 



Shell umbilicated, minute, depressed-convex ; epidermis whitish ; whorls 

 4, convex, not increasing rapidly in diameter, with microscopic wrinkles; 

 suture very distinctly impressed ; aperture nearly circular ; peristome thin, 

 acute ; umbilicus large, not spread, deep, and exhibiting the volutions ; base 

 rounded, columella with a thin callus. Greater diameter 2\, lesser 2^ mill. ; 

 height, 1 mill. 



Helix minuscula, Binney, Bost. Journ. Nat. Hist., III. 435, PI. XXII. Fig. 4 

 (1840); Terr. Moll., II. 221, PL XVII. Fig. 2, excl. syn.— Adams, Vt. 

 Moll., 161 (1842).— Chemnitz, 2d ed., II. 112, Tab. LXXXV. Figs. 20-23.— 

 Pfeiffer, Symbol., II. 33 ; Mon., I. 114. — Reeve, Con. Icon., 731 (1852). — 

 W. G. Binney, Terr. Moll., IV. 102. —Morse, Amer. Nat., I. 543, Fig. 35 

 (1867). 



Helix mimUalis, Morelet, nee F£r. Test. Nov., II. 7. 



Helix apex, Adams, Contr. Conch., 36. — Reeve, 1. c. 339. 



Helix Lavelleana, D'Orbigny, Moll. Cub. in text, 161, excl. PI, (1853). 



Helix Mauriniaiia, D'Orbigny, 1. c. in PI. VIII. Figs. 20-22, excl. text. 



Pseudohyalina ininuscula, Morse, Journ. Portl. Soc, I. 16, Fig. 34, PI. VII. 

 Fig. 35 (1864). —Tryon, Amer. Journ. Conch., II. 264 (1866). 



Hyalina minuscula, W. G. Binney, L, k Fr.-W. Sh., I. 37 (1869). 



Zonites minusculus, Fischer and Crosse, Moll. Mex., 175 (1870). 



From the Red River of the North to Arkansas, Texas, and Florida. It may 

 thus be said to inhabit all the Eastern Province ; in the Central Province in 

 Arizona ; has lately been found in California, and has been traced through Mex- 

 ico into Yucatan ; is quoted from Bermuda, Cuba, Jamaica, and Porto Rico. 

 In Japan it has also been noticed (Ann. Mag. Nat. Hist., June, 1868). I am 

 inclined to believe, therefore, that it will prove, like Z. fulvus, to be one of the 

 circumpolar species common to the three continents. 



Jaw long, narrow, but slightly arcuate, of almost uniform width, ends 



