HYALINA. 



33 



Fig. HS. 



Hyalina arborea, Say. — Shell umbilicated, depressed, very 

 slightly couvex, thiu, pellucid ; epidermis amber-colore.l, smooth, shining ; 

 whirls four to five, with very minute, oblique striae, apparent 

 when viewed with the microscope ; aperture transversely 

 rounded ; peristome thin, acute ; umbilical region indented ; 

 umbilicus moderate, well developed, round, and deep. Greater 

 diam. 5, lesser 4^ ; height 2| mill. 



Helix arhorca, Say, Nich. Encyc. pi. iv, f. 4; Bixney's ed. 5, 

 pi., Ixxii, f. 5 (1817, 1S18, 1819).— Eaton, Zool. Text- 

 Book, 193 (182G).— BiNNEY, Bost. Journ. Nat. Hist. Ill, 

 422, pi. xxii, f. 1 (1840) ; Terr. Moll. II, 235, pi. xxix, 

 f. 3.— DeKay, N. Y. Moll. 30, pi. ii, f. 10 (1843).— 

 Gould, Invertebrata, 182, f. 110 (1841).— Adams, Vermont Mollusca, 

 IGO (1842).— Pfeiffer, Mon. Hel. Viv. I, 95.— Chemnitz, 2d ed. IF, 

 114, tab. Ixxxv, f. 33-35.— Reeve, Con. Icon. 733.— W. G. Biknev, 

 Terr. Moll. IV, 116.— Morse, Amer. Nat. I, 542, f. 30 (18G7). 



Helix ottonis, Pfeiffer, olim, Weigm. Arch. 1840, I, 251. — Binney, Terr. 

 Moll. II, 238, pi. xxix, a, f. 3.— W. G. Binney, T. M. IV, 117. 



Eyalina arhorea, Morse, Journ. Portl. Soc. I, 14, f. 28, pi. vi, f. 29 

 (18G4).— Tryon, Am. .Journ. Conch. II, 251, pi. iii, f. 17 (186tJ). 



Hyalina ottonis, Tryon, Am. Journ. Conch. II, 251, pi. iv, f. 26 (1866). 



From Labrador to Texas and on the Rio Chania in New 

 Mexico ; from Florida to Great Slave Lake ; also in Washoe Co., 

 Nevada ; in Montana and California. It is also said to be found 

 in Cuba; also iu Guadeloupe. 



Jaw arcuate, narrow, with curving:, '^' 



pointed ends ; anterior surface with a few y^^^Ji' i 



stria3 ; concave margin smooth, with a 

 wide median projection ; convex margin 

 with a corresponding depression. 



Lingual membrane with 82 rows of 21 — 1 — 21 teeth of the 



Jaw of Iliinlhin aiborea. 

 [Mouse.] 



Fie. 40. 



Lingual dentition of hyalina arhorea. [MoBaU.J 

 3 June, 1838. 



