418 ' 
IIELIX §. 78. 
dilatata, basali dentibus 2 aculis munito. — Diam. maj. 13, min. 
11, ait. 7y2miII. (ColJ. Nr. 662.) 
Helix ventrosida Pfr, in Proc. Zool. Soc. 1 845. p. 1 3 1. 
— — Che))l7i. cd. II. Helix N. 385. t. 65. f. 5. 6. 
Habitat in Mexico (Ilinds), Texas (Sowerby). 
Obs. Ditferl ab H. tcxasiana rima umbilicali brevissima, lesiae forma, 
dentibus ap^lurae, ola . ^ 
-1086. H. tcxasiana Moricand. 
T. perforata, orbiculato- depressa, tcnuiuscula, nitidula, alba 
vel rubella, superne conferlim plicata, basi convexa, laevigata; 
spira brevissima, vix elevata; anfr. 5 planulati, ultimus prope 
aperturam argute plicatus, antice deflexus, subtus constrictus, 
basi devians, rimam arcuatam formans; apertura lunaris, co- 
arctata; perist. album, reflexum, marginibus dente linguiformi, 
acuto, triangulari junctis, dextro dente minuto, basali dente vali- 
diore munito. — Diam. maj. 10, min. 8V3, ait. 5 mill. (Coli. 
Nr. 663.) 
Helix texasiana Moric. Mem. Gcn. VI. P. 2. p. 538. t. t. f. 2. 
— — Lam, ed. Dlr. 221. p. 133. 
— — Chenm. ed. H. Helix N. 56. t. 10. f. 11. 12. 
— fatigiata Binn. in Bosl. journ. III. p. 388. t. 19. f. 3. 
— triodonta Jan in sched. 
— .... Fer. hist. t. 69 D. f. 2. 
Polygyra plicata Say in Philad. journ. U. p. 162. 
Tridopsis tridonta Beck ind. p. 22. 
fl. Distinctius carinata: 
Polygyra fatigiata Say descr. of new shells etc. p. 1 4. 
y. SIajor, cornea, linea 1 rufa supra peripheriam cingulata, anfr. 6; 
diam. 1 1 , ait. 5 niill. (jGolI. Menk.) 
Habitat in Texas (Moric., Jay), Alabarfia (Say), var. /S prope New 
Harmony (Say), var. y in Texas. 
^ 1037- H- avara (Polygyra) Say- 
T. rimato-perforata , depressa, striata, hispida, fusco-cornea ; 
spira brevissima; anfr. 5 planiusculi, ultimus basi umbilicum 
latum, non pervium formans; apertura brevis, coarctata, triangu- 
lari-subreniforrais; perist. reflexum, marginibus dente magno, 
uncinato junctis , basali dente majusculo triangulari, dextro dente 
latiore illi approximato, munito. — Diam. maj. 9, min. 7, ait. 
syainill. (Coli. Ni*. 664.) 
Polygyra avara Say in Philad. journ. 1. P. 2. p. 277. 
Helix avara (Helicodonta) Fer. pr. 97. Hist. t, 50. f. 2. 
— _ Chemn. ed. II. Helix N. 383. t. 65. f. 1. 2. 
— Sayi Wood suppi, t. 7. f. 34, 
