396 HELICIDiE. 



There can be no doubt that the H. glaphyra of Say is identical 

 with the H. cellaria of Miiller ; a comparison of shells of the same 

 size and growtli showing them to be absolutely similar in every 

 respect. It was probably imported from Europe, as it may have 

 easily been, about water-casks, greenhouse plants, &c. 



The shell which is very commonly found marked as H. g^laphyra 

 is the H. inornata, Say, in an immature state. This is a less deli- 

 cate shell, but in its earlier stages, Avhen there is but a small umbil- 

 icus, there is no inconsiderable resemblance between the two, and 

 it would accord well with the description ; but no one familiar with 

 the present species would ever mistake one for the other. 



Hyalina arbor e a. 



Fig. 110. 



Shell small, orbicular, flepressed, tliin, pellucid, shining; brownish horn colored; 

 whorls four, minutely wrinkled ; aperture rounded ; lip simple ; umbilicus open. 



Helix arhorea, Say, Nicli Encyc. pi. 4, fiij. 4. — Binney's ed. 5, pi. 72, fig. 5 (1817, 1818, 



1819).— Eaton, Zool. Text Book, 193 (1826). — Bixney, Best. Journ. Nat. Hist. 



iii. 422, pi. 22, fig. 1 (1840) ; Terr. Moll. ii. 2.3.5, pi. 29, fig. 3. — De Kay, N. Y. 



Moll. 30, pi. 2, fig. 10 (1843). — Gould, Iiiv. 182, fig. 110 (1841 ). — Adams, Vir- 



niont Moll. 160 (1842). — Pfeiffeh, Mon. Hel. Viv. i. 9.5. — Chemnitz, 2d ed. ii. 



114, t. 5, figs. 33-35. — Reeve, Con. Icon. 733. — W. G. Binney, Terr. Moll. iv. 



116. — Mouse, Amor. Nat. i. 5l2, fig. 30 (1867). 

 Helix- Ottoiiis, Pfeiffer, olim, Wiegm. Arch. 1840, i. 251. — Binney, Terr. Moll. ii. 



238, pi. 29 a, fig. 3. — W. G. Binney, Terr. Moll. iv. 117. 

 Hyalina arhorea, Morse, Journ. Portl. Soc. i. 14, fig. 28 ; pi. 6, fig. 29 (1864). — Tryon 



Am. Journ. Conch, ii. 251, pi. 3, fig. 17 (186G). 

 Hyalina Ottonis, Tryon, Am. Journ. Couch, ii. 251, pi. 4, fig. 26 (1866). 



Shell small, orbicular, sliglitly elevated, the apex a little de- 

 pressed, concave beneath, brownish horn colored, smooth, thin, 

 fragile, pellucid, shining ; whorls five, slightly rounded 

 '^' ■ above, separated by a well-impressed suture, marked with 

 very fine lines of growth, more decidedly wrinkled at the 

 suture ; l)eneath very smooth, regularly rounding into a 

 moderately large, deep, and well-developed uml)ilicus ; ap- 

 erture rounded ; lip simple and thin. Diameter commonly 



H arborea ^^^^ ^^^"^ ^^ ^^^ iiicli, sometlmes one fourth. 



Animal lias the head and eye-peduncles blackish, upper 

 parts bluish, posterior parts whitish, transparent. Foot thin and 

 narrow. 



A very common species, always to be found about decaying 

 stumps, old logs, &c. It is found from Labrador to Texas, and on 



