HELIX §. 59. 317 



826. H. obstricta Say. 



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

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

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

 tura obliqua , subtriangularis, denle linguiformi. arcuatim intrante 

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

 late albo-callosum, margine supero valide unidentato, basali 

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

 rain. 22, alt. 11 mill. (Mus. Cuming.) 



Helix ohstricta Say in Plillacl. journ. II. p. 154. 



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

 Carocolla helicoides Lea obs. I. p. H3. t. 15. f. 34. 



Habitat iu America boreali: Ohio (Say). 



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



S27. H. appressa Say. 



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

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

 planulati, ultimus obtusc angulatus (angulo antice evanescente), 

 antice constrictus; apertura coarctata, subtriangularis; perist. 

 angulatim late reflexum, intus callosum, marginibus callo tenui, 

 dentem linguiformem, oblique intrantem emiltente, junctis, dextro 

 et basali strictiusculo obsolete dentatis. — Diam. maj. 18. min. 15, 

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



Helix appressa Say iu Philad. journ. II. p. 151. 



— — Bin7l. in Bost. journ. III. p. 356. t. 8. 



— — Chemn. ed. U. Helix N. 372. t. 63. f. 17. 18. 



— linguifera (Hellcodonta) Fer. pr. 95. Hist. t. 49 A. f. 3. 



— — Lam. 93. p. 90. ed. Dh. p. 70. 

 Tridopsis appressa Beck ind. p. 22. 



Habitat in America boreali : Ohio et Missouri. 



828. H. dentifera Binney. f 



T. obtecte perforata, superne depressa, subtus convexa, ol)Ii- 

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

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

 reflexum; paries aperturalis dente prominente albo instruclus. — 

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



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

 Habitat in America boreali : Vermont. 



829. H. elevata Say. 



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

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



