418 IIELIX §. 78. 



dilatata, basali dentibus 2l acutis munito. — Diara. maj. 13, min. 

 11, alt. Tyamill. (ColJ. Nr. 662.) 



IJelix ventrosida Pfr. in Proc. Zool. Soc. 1 845. p. 131. 



— — Chemn. ed. II. Helix N. 385. t. 65. f. 5. 6. 



Habitat in Mexico (Hinds), Texas (Sowerby). 



Obs. Differt ab H. texasiana rima umbilicali brevissima, testae forma, 

 denlibus aperturae , etc. 



10S6. H. texasiana raoricand. 



T. perforata, orbiculato-depressa, tenuiuscula, nitiduia, alba 

 vel rubella, superne confertim 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. — Diara. raaj. 10, min. 8V3, alt. 5 mili. (Coll. 

 Nr. 663.) 



Helix texasiana Moric. Meni. Gen. VI. P. 2. p. 538. t. 1. f. 2. 



— — Lam. ed. Dh. 221. p. 133. 



— — Chemn. ed. II. Helix N. 56. t. 1 0. f. H . 12. 



— fatigiata Binn. in Bost. journ. III. p. 388. t. 19. f. 3. 



— triodonta Jan in sched. 



— .... Fer. liist. t. 69 D. f. 2. 



Polygyra plicata Say in Philad. journ. II. p. 162. 

 .. y. / Tridopsis tridonta Beck ind. p. 22. 

 if/?? A/ j/S.^stiactius carrnata : 

 dj-ay' L Polygyra fatigiata Say descr. of new shells etc. p. 1 4. 



y. Major, cornea , Hnea 1 rufa supra peripheriam cingulata, anfr. 6: 



diam. 1 1 , alt. 5 mill. (Goll. Menk.) 

 Habitat in Texas (Moric. , Jay), Alabama (Say), var. ^ prope New 

 Harraony (Say), var. y in Texas. 



10S7. 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-subreniformis ; perist. reflexum, marginibus dente magno, 

 uncinato junctis , basali dente majusculo triangulari, dextro dente 

 latiore illi approximato, munito. — Diam. maj. 9, min. 7, alt. 

 Syamill. (Coll. Nr. 664.) 



Polygyra avara Say in Philad. jouin. I. P. 2. p. 277. 



FJelix avara (Helicodonta) Fer. pr. 97. Hist. t. 50. f. 2. 



— — Chemn. ed. II. Helix N. 383. t. 65. f. 1.2. 



— Sayi Wood suppl. t. 7. f. 3 4. 



