396 HELICID.E. 



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

 witli tlie H. cellaria of Miiller ; a comparison of shells of the same 

 size and growth 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. iiiornata, 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 arJiwea, Say, Nich Encyc. pi. 4, fig. 4. — Binney's ed. .5, pi. 72, fig. 5 (1817, 1818, 

 1819). — Eatox, Zoo). Text Book, 19.3 (1826).— Bixney, Best. Journ. Nat. Hist, 

 iii. 422, pi. 22, fig. 1 (1840) ; Terr. IMoll. ii. 23.5, pi. 29, fig. 3. — De Kay, N. Y, 

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

 mont Moll. 160 (1842). — Pfeiffer, Men. Hel. Viv. i. 9.5. — Chemnitz, 2d cd. ii. 

 114, t. 5, figs. 33-35. — Reeve, Con. Icon. 7.33. — \V. G. Binney, Terr. Moll. iv. 

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



Helix Ottonis, Pfeiffer, oliin, Wiegm. Arch. 1840, i. 251. — Binney', Terr. Moll. ii. 

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



HijaJina arJiorca, Morse, Journ. Portl. Soc. i. 14, fig. 28; pi. 6, fig. 29 (1SG4). — Tryox 

 Am. Journ. Conch, ii. 251, pi. 3, fig. 17 (1866). 



Hyalina Ottonis, Tryon, Am. Journ. Conch, ii. 251, pi. 4, fig. 26 (186G). 



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. 655. ai)Qyg^ 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, deej), and well-developed umbilicus ; ap- 

 erture rounded ; lip simple and thin. Diameter commonly 

 „ , one fifth of an inch, sometimes one fourth. 



H. arborea. " 



Animal has the liead and eye-peduncles Idaekish, 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 



