HELIX §. 19. 
95 
/ 234* H. arborea Say. 
T. umbilicata, depressa, nitidula, strialula, virenti- vel fui- 
vescenti-cornea ; spira convexa, parum elata; anfr. 4 — con- 
vexiuscuH, ultimus vix depressus; umbilicus angustus, pervius; 
apertura lunato-circularis ; perist. simplex, acutum. — Diam. maj. 
5, min. 4ya, ait. 2% mill. (Coli. Nr. 125.) 
Hdkc arborea Say Amer. Enc. t. 4. f. 4. 
— — (Helicella) pr. 2 i 9. 
“ — Binn. in Bost. journ. IIL p. 422. l. 22. f. 1. 
— — Gotdd report p. 1 82. f. 1 1 0. 
— — Pfi\ Symb. n. p. 23. 
— Chemn. ed. II. Helix N. 533. t. 85. f. 33 — 35. 
— nitidula /3 Fet\ ? 
— Ottoniz /y}’. in Wiegni. Arch. 1840. I. p. 251. 
Habitat in America boreali : Ohio, Massacbusetls; nec non in 
insula Cuba ! 
Obs. Comparata speciminum copia H. Otlonis ab arborea specifice sepa- 
randam non esse cognovi. 
235- H. nitensoidcs Orbigny. -J* 
T. orbiculato-depressa, umbilicata, tenuis, pellucida, succinea, 
lucida; spira convexiuscula ; anfr. 5 minime distincti; apertura 
semilunaris. — Diam. 9, ait. 5 mill. (0.) 
Helix nitensoides Orb. cub. I. p. 1 6 1 . i. 1 0. f. 9 — 1 2. 
Habitat in insula Cuba. 
Obs. An varietas praecedentis? 
236. H. vortex Pfr. 
T. anguste umbilicata, convexo -discoidea, hyalina; anfr. 5Vz 
convexiusculi, angusti, obsolete striati, ultimus subangulatus, 
plerumque deorsum deviatus; apertura lata, lunaris; perist. sim- 
plex, acutum, margine columellari reflexiusculo. — Diam. maj. 6, 
min. Sy 2 , ait. 2y4 — 3y2 mill. (Coli. Nr. 126.) 
Helix vortex Pfr, in Wiegm. Arch. 1839. I. p. 351. 
— — Chemn. ed. II. Helix N. 526. t. 85. f. 7 — 9, 
Habitat in provincia Canimarensi insulae Cubae! In insula St. 
Croix Indiae occidentalis (Mus. Cuming.). 
237. H. peraffinis Adams. 
T. umbilicata, depressa, striatula, hyalina; spira brevissima, 
obtusa; anfr. 6 convexi, ultimus rotundatus, basi planiusculus ; 
umbilicus mediocris; apertura sub verticalis , triangulato-Iunaris; 
perist. simplex, acutum, margine dextro subverticali, columellari 
