HELIX §. 59. 317 



826. H. obstricta Say. 



T. obtecte perforata, depressa, costulato-striata, epidermide 

 nuda, paliide fusca vestita; spira planiuscula ; anfr. depressi, ul- 

 timus basi convexus , acute carinatus :" carina prominente ; aper- 

 tura obliqua , subtriangularis, dente linguiforrai, arcuatim intrante 

 parietis aperturalis coarctata; perist. tenue, late expansum, intus 

 late albo - callosum , margine supero valide unidentato , basali 

 stricto, diiatato, reflexo, obsolete unidentato. — Diam. maj. 26, 

 min. 22, alt. 11 mill. (Mas. Guming.) 



Helix obstricta Sayin Philad. journ. II. p. 154. 



— denotata var. Fer. hist. t. 50 A. f. 7. 

 Carocolla helicoides Lea obs. I. p. 1 1 3. t. 15. f. 34. 



Habitat in America boreali: Ohio (Say). 



Obs. Peraffinis H. palliatae. Num ejus varielas habenda? 



827. H. appressa Say. 



T. obtecte perforata, orbiculato-depressa, pellucida, costu- 

 lato-striata, corneo-lutescens; spira planulata; anfr. 5 superne 

 planulati, ultimus obtuse angulatus (angulo antice evanescente), 

 antice constrictus; apertura coarctata, subtriangularis; perist. 

 angulatim late reflexum, intus callosum, marginibus callo tenui, 

 dentem linguiformera, oblique intrantem eraittente, junctis, dextro 

 et basali strictiusculo obsolete dentatis. — Diam. maj. 18. min. 1 5, 

 alt. 8 mill. (Goll. Nr. 506.) 



Helix appressa Say in Philad. joum. II. p. 151. 



— — Binn. in Bost. journ. III. p. 356. t. 8. 



— — Chemn. ed. II. Hehx N. 372. t. 63. f. 17. 18. 



■ — linguifera (Hehcodonta) Fer. pr. 95. Hlst. t. 49 A. f. 3. 



— — Latn. 93. p. 90. ed. Dh. p. 70. 



Tridopsis appressa Beck ind. p. 22. . 



Habitat in America boreali : Oliio et Missouri. 



828. H. dentifera Binney. -J- 



T. obtecte perforata, Superne depressa, subtus convexa, obli- 

 que subtiliter striata, unicolor luteo-cornea ; anfr. 5 vix convexius- 

 culi; apertura coarctata, lunaris; perist. albura, late et abrupte 

 reflexum; paries aperturalis deote prominente albo instructus. — 

 Diam. 21, alt. 10 milI.,(B.) 



Helix dentifera Binn. in Bost. journ. I. p. 495. t. 21. 

 Habitat in America boreali : Verraont. 



829. H. elevata Say. ~ 



T. obtecte perforata , subglobosa, oblique striata, sub epider 

 mide lutescente alba; spira elevata, turbinata; anfr. 7 convexius- 



