38 



LAND AND FRESH-WATER SHELLS OF N. A. [PART L 



Helix minutalis, Morelet, nee. Fer. Test. Nov. II, 7. 

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

 Helix lavelleana, D'Orbigny, Moll. Cub. in text, 161, excl. pi. (1853). 

 Helix mauriniana, D'Orbigny, I. c. in pi. viii, f. 20-22, excl. text. 

 Pseudohyalina minuscula, Mokse, Journ. Portl. Soc. I, 16, f. 34, pi. vii, f. 

 35 (1864),— Tryon, Am. Journ. Conch. II, 264, pi. iv, f. 62 (1866). 



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

 may thus be said to inhabit all eastern North America ; has 

 lately been found in California, and is 

 quoted from Bermuda, Cuba, Jamaica, 

 and Porto Rico. 



Jaw long, narrow, but slightly arcuate, 



of almost uniform width, ends rounded ; 



anterior surface with central longitudinal 



stria3 ; concave margin smooth, 



with a slightly developed, broad, 



median projection. 



Lingual membrane with 52 

 curving rows of 12 — 1 — 12 teeth 

 each ; centrals tricuspid, laterals 



Fig. 51. 



Jaw of Hyalina mintiscula. 

 [Morse.] 



Fig. 52. 



Lingual dentition of Hyalina minuscula. 

 [Morse.] 



bicuspid ; uncini curved, acute. 



Fig. 53. 



Hyalina milium^ Morse. — Shell widely umbilicated, depressed, 

 transparent, shining, white, with a greenish tinge, marked with distinct 

 and regular stri;B of growth and microscopic revolving 

 lines, the latter more conspicuous below ; spire but 

 slightly elevated ; whirls three, rounded, rapidly in- 

 creasing, the last planulate above, widely umbilicated 

 'below ; aperture very oblique, subcircular, remote from 

 the axis ; peristome simple, acute, its terminations some- 

 what approached, that of the columella not reflected. 

 Greater diam. 1^ ; height ^ mill. 



Hyalina milium, 



enlarged. 



\ 



Helix milium, Morse, Proc. Bost. Soc. VII, 28 (1859). — 

 W. G. BiNNEY, Terr. Moll. IV, 101, pi. Ixxix, f. 4-5. 

 —Morse, Anier. Nat. I, 543, f. 36 (1867). 

 Striaiura milium, Morse, Journ. Portl. Soc. I, 18, f. 41, 

 42, pi. vii, f. 43 (1864). 

 Pseudoln/alina milium, Tryon, Am. Journ. Conch. II, 265, pi. iv, f. 56 

 (1866). 



