IIELIX g. 34. 183 



aiifr. 7 angusti, convexiusculi, ultimus basi subplanus, incdio ini- 

 [)ressus, laevigalus, lineis concentricis obsoletis sub iente notatus; 

 apertura late lunaris, basi costis 2 vaiidis, margineni non attin- 

 gentibus, munita; perist. simplcx, acutum, margine columellari 

 perobliquo, calloso. — Diani. maj. 9^2, min. 0, alt. o — 6% mill, 

 (Coli. Nr. 272.) 



Helix bicostata Pfr. Symb. III. p. 09. 



— — Chemn. ed. II. Helix t. 100. f. 21 —23. 



— Rafinesquea Fer. pr. 3H. Hist. t. 51 A. f. 5? 

 Habitat in Tennessee Americae borealis. 



Obs. Variat sicut H. gularis Say spira magis minusve elevata el plica 

 alteia, rarius ambabus, obsolelis. — Differt ab H. interna Say spira convexa, 

 sculplura etc. , ab H. epislylioidis speciiuinibus junioribus anfraclii)us angustis, 

 (oslis inlernis validis elc. 



473. H. interna Say. 



T. angustissime perforata, orbiculato-convexiuscula, supernc 

 regulariler et confertim costulata, 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 pliciformibus , ad marginem non porrigentibus, munilo. — 

 Diam. 5 '/2, alt. 3 '/2 mill. (CoII. Nr. 273.) 

 Helix interna Say in Philad. journ. II. p. 155. 



— — Binn. in Bost. journ. IH. p. 405. t. 21. f. 1. 



— — Chemn. ed. H. Helix t. 10 1. f. 1—4. 



— pomiim Adami Green, i^sie^^vonn cAiA. 1845. 



(i. Major, semiglobosa , rufescens , anfr. 9: diam. maj, 7% nnn. 7, 



alt. 4% miil. (Coll. Philipp.) 

 Ilabitat in America boreali : Missouri, Ohio, Penusylvania Virginia. 



474. H. gularis Say. 



T. subperforata, orbiculato-convexa, tenuis, striatula, nitida, 

 luteo-cornea; anfr. 5 '/2 — 6 angusti, planiusculi; apertura lunaris, 

 intus dentibus 2 pliciformibus, margini basali adnatis, e.xtus con- 

 spicuis, coarctata; perist. simplex, aculum. — Diam. maj 6%, 

 min. 6, alt. 3% mill. (CoII. Nr. 27i.) 



Helix gidaris Say in Philad. journ. IF. p. 156. 



— — (Helicodonla) Fcr. hist. t. 51 A f. 4. 



— — Binn. in Bost. jomn. HI p 408. t 1 1. f. I. 



— — Pfr. Symb. II. p. 2 9. 



— — Chemn. ed. H. Helix i 101 f 5-8. 

 Surjda? gularis Beck ind. p. 9. 



/'?. Apertura uniplicala : 



Helix sxppressa Saij descr. of new terr. bhclb p. 14. 



