HELIX §.34. 183 



anfr. 7 angusti, convexiusculi, ultimus basi subplanus , niedio im- 

 pressus, laevigatus, lineisconcentricis 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. 9, alt. 5 — 6/2 mill. 

 (Coll. Nr. 272.) 



Helix bicostata Pfr. Symb. III. p. 69. 



— — Cheimi. ed. 11. Helix t. I 00. f. 21 — 23. 



— Rafitiesquea Fer. pr. 3 H . Hist. t. 5 1 A. f. 5 ? 



Habitat in Tennessee Americae borealis. 



Obs. Variat sicut H. gularis Say spira magis minusxfe elevala el plica 

 altera, rarius ambabus, obsolelis. — Differt ab H. inlerna Say spira convexa, 

 sculplura elc. , ab H. epislylioidis speciminibus junioribus anfractibus angustis, 

 costis inlernis validis elc. 



473. H. interna Say. 



T. angustissime perforata, orbiculato-convexiuscula, superne 

 regulariter et confertira 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, munito. — 

 Diam. 5^2, alt. Sy^ mill. (Coll. Nr. 273.) 

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



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



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



— joowmm ^c?amj GVeen; teste Bronn catal. 1845. 



/?. Major, semiglobosa , rufescens , anfr. 9: diam. maj; 7V2, min. 7, 

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

 Habitat in America boreali : Missouri, Ohio, Pennsylvania, Virginia. 



474^-jaw-€;ttlaris Say. ^^rfrr^^\ 



T. subperforata, orbiculato-convexa , tenuis, slriatula, nitida, '■:fJ'T''y'"' 

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

 intus dentibus 2 pliciformibus , margini basali adnatis, extus con~ 

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

 min. 6, alt. VJ^ mill. (Coll. Nr. 274.) 



Helix gularis Say in Philad. journ. II. p. 156. 



— ■ — (Helicodonta) Fer. liist. t. 51 A f. 4. 



— — Binn. in Bost. journ. III. p. 408. t. M . f . I. 



— — Pfr. Symb. H. p. 2 9. 



.— — C/ie/mL ed. II. Hehx t 101. f. 5-8. 



Sagda? gularis Beck ind. p. 9. 



/9. Apertura unipUcata : 



Helix suppressa Say descr. of new terr. shells p. 14. 



