HELIX 8. 34. 
183 
anfr. 7 angusti, convexiusculi, ultimus basi subplanus , medio im- 
pressus, laevigatus, lineis concentricis obsoletis sub lente notatus; 
apertura late lunaris, basi costis 2 validis, marginem non attin- 
gentibus, munita; perist. simplex, acutum, margine columellari 
perobliquo, calloso. — Diam. maj. 9/2, min. 0, ait. 5 — 6/2 mill. 
(Coli. Nr. 272.) 
Helix bicostata Pfr. Symb. HI. p. 69. 
— — Cliem7i. ed. II. Helix t. 100. f.\l — 23. 
— Rafinesqtiea Fer. pr. 311. Hist. t. 5 1 A. f. 5 ? 
Habitat in Tennesseo Americae borealis. 
Obs. Yarial sicut H. gularis Say spira magis miiiusve elevata et plica 
altera, rarius ambe^ibus , obsoletis. — Diftert ab H. interna Say spira convexa, 
sculptura elc. , ab H. epislylioidis speciminibus junioribus anfractibus angusli-s, 
costis internis valuUs clc. 
^ 473. H. interna Say. 
T. angustissime perforata, orbiculalo-convexiuscula, superne 
regulariter et confertim coslulata, subtus laeviuscula, nitida, pal- 
lide cornea; spira parum elevata; anfr. 7 angusti, superne pla- 
nuli, ultimus basi convexior; umbilicus punctiformis; apertura 
late lunaris; perist. simplex, acutum, margine basali dentibus 
2 pliciforraibus , ad marginem non porrigentibus, munito. — 
Diam. 5/2, ait. 3/2 mill. (CoII, Nr. 273.) 
Helix interna Say in Philad. journ. II. p. 1 55. ^ 
— — Binn. in Bost. journ. III. p. 405. l. 21. f. I. 
— — Chemn. ed. II. Helix t. 10 1. f. I —4. 
— pomum Adami GreeUj teste Bronn catal 1845. 
Major, semiglobosa, rufescens, anfr. 9: diam. maj. 7 '/ 2 , min. 7, 
ait. 4y4 mill. (Coli. Philipp.) 
Habitat in America boreali ; Missouri, Ohio, Pcnusylvauia, Virginia. 
474, H. gularis Say. 
T. subperforata, orbiculato-convcxa , tenuis, strialula, nitida, 
luteo-cornea; anfr. 5V2 — 6 angusti, plauiusculi; apertura lunaris, 
intus dentibus 2 pliciformibus, margini basali adnalis, extus con- 
spicuis, coarctata; perist. simplex, acutum. — Diam. maj. GYa, 
min. 6, ait. 3% mill. (Coli. Nr. 274.) 
Helix gularis Say in Philad. journ. II. p. 156. 
— — (Helicodouta) Fer. bisl. t. 5 I A f. 4. 
— — Bvm. in Bost. journ. III. p. 4 08. t, 11,1 I. 
— — Pfr. Symb. II. p. 29. 
— — Chemn. ed. II. Helix t. 101. f. 5 — 8. 
Sagda? gidaris Beck ind. p. 9. 
(i. Apertura unipUcala : 
Helix siq)pressa Say descr. of ncw icrr. sliclls p. 14. 
