HELIX §. 59. 
317 
^ 826. H. obstricta Say. 
T. obtecte perforata, depressa, costulato-slriata, epidermide 
nuda, pallide fusca vestita; spira planiuscula; anfr. depressi, ul- 
timus basi convexus , acute carinatus: carina prominente; aper- 
tura obliqua, subtriangularis, dente linguiformi, arcuatim intrante 
parietis aperturalis coarctata; perist. tenue, late expansum, intus 
late albo -callosum, margine supero valide unidentato, basali 
stricto, dilatato, reflexo, obsolete unidentato. — Diam. maj. 26, 
min. 22, ait. 11 mill. (Mus. Cuming.) 
llzlix obstricta Say in Philad. joiirn. II. p. 154. 
— denotata var. Fer. hist. t. 50 A. f. 7. 
Carocolla helicoides Lea obs..L p. 113. t. 15. f. 34. 
Habitat iu America boreali: Ohio (Say). 
Obs. Peraffinis II. palJialao. Num ejus vf^rietas 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 linguiformem, oblique intrantem emittente, junctis, dextro 
et basali strictiusculo obsolete dentatis. — Diam. maj. 18, min. 1 5, 
ait. 8 mill, (Coli. Nr. 506.) 
Helix appressa Say ia Philad. journ. II. p. 151. 
— — Binn. in Bost. journ. III. p. 356. t. 8. 
— — Chemn. ed. II. Helix N. 372. t. 63. f. 1 7. 1 8. 
— linguifera (Ilelicodonta) 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 Binncy. 
T. obtecte perforata, superne depressa, subtus convexa, obli- 
que subtiliter striata, unicolor luteo-cornea ; anfr. 5 vix convexius- 
cufi; apertura coarctata, lunaris; perist. album, late et abrupte 
reflexum; paries aperturalis dente prominente albo instructus. — 
Diam. 21 , ait. 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 
inid§ lutescente alba; spira elevata, -turbinata; anfr. 7 convexius- 
