396 HELICID.E. 



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

 with the H. cellar ia of Muller ; a conipai'i.son of shells of the same 

 size and growth showing them to l^e absolutely similar in every 

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

 easily l)een, about water-casks, greenhouse plants, ko,. 



The sliell which is very commonly found marked as H. giapltyra 

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

 cate shell, but in its earlier stages, when 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 arborea. 



Fig. 110. 



Shell small, orbicular, depressed, thin, pellucid, shining; brownish horn colored; 

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



Helix nrhoren, Say, Nich Encyc. pi 4, fie;. 4. — Binney's ed. .5, pi. 72, fig. 5 (1817, 1818, 



1819). — Eatox, Zool. Text Book, 193 (182G).— Binney, Best. Journ. Nat. Hist. 



iii. 422, pi. 22, fisr. 1 (1840) ; Terr. IMoll. ii. 235, pi. 29, fig. 3. — De Kay, N. Y. 



Moll. 30, pi. 2, fig. 10 (1843). — Gould, Inv. 182, fig. 110 (1841). — Adams, V< r- 



mont Moll. 160 (1842). — Pfeiffer, Mon. Hcl. Viv. i. 9.'i. — Chemnitz, 2d cd. ii. 



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



116. —Morse, Amer. Nat. i. 542, fig. 30 (1867). 

 Helix Ononis, Pfeiffer, olim, Wiegm. Arch. 1840, i. 231. — Binney, Terr. Moll. ii. 



238, pi. 29a, 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. 231, pL 3, fig. 17 (1866). 

 Hi/ahnu Oltonis, Tryon, Am. Journ. Conch, ii. 231, pi. 4, fig. 26 (1866). 



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

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

 fragile, pellucid, shining ; whorls five, slightly rounded 

 Fig. 65.5. above, separated by a well-impressed suture, marked with 

 very fine lines of growth, more decidedly wrinkled at the 

 suture ; beneath very smooth, regularly rounding into a 

 moderately large, dee]), and well-developed umbilicus ; ap- 

 erture rounded ; lip simple and thin. Diameter commonly 

 one fifth of an inch, sometimes one fourth. 



Animal has 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 



