418 IIELIX §. 78. 



dilalala, basali dentibus 2 acuiis munilo. — Diam. maj. 13. min. 

 11, alt. 7/2milI. (Coll. Nr. 662.) 



Ilelix ventrosida Pfr. in Proc. Zool. Soe. 1845. p. 131. 



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



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



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

 dcnlibus aperturae, etc. 



10S6. H. texasiana Moricand. 



T. perforata, orbiculato-dcpressa, tonuiuscula, nitidula, alba 

 vel rubella, superne confertim plicata, basi convexa, laevigata; 

 spira brevissima, vix elevata; anfr. 5 planulati, uUimus prope 

 aperturain argute plicatus, antice deflexus, subtus constriclus, 

 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. 8 '/3, alt. 5 mill. (Coll. 

 Nr. 663.) 



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



— — La7n. ed. Dh. 221. p. 133. 



— — Chenm. cd. II. Helix N. 56. t. 10. f. H. 12. 



— fatigiata Binn. in Bost. joui-n. III. p. 388. t. 19. f. 3. 



— triodonta Jan in sched. 



— .... Fer. hist. t. 69 D. f. 2. 



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



Tridopsis tridonta Beck ind. p. 22. 

 /9. Distinctius carinala: 



Polygyra fatigiata Say descr. of new shells etc. p. 1 4. 

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

 diam. 1 1 , ait. 5 mill. (Coli. Menk.) 



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

 Harmony (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. 

 5y2mill. (Coll. Nr. 664.) 



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



Helix avara (Hehcodonta) Fer. pr. 97. Hist. t. 50. f. 2. 



— — Chemn. ed. II. Helix N. 383. t. 60. f. 1.2. 



— Sayi Wood suppl. t. 7. f. 3 4. 



