HELIX §. 129. 315 



2027. H. Chiapensis Pfr. 



T. umbilicata, depressa, solidula, striata, nitida, albido- 

 cornea, ad suturam fusculo-fasciata ; spira breviter conoidea; 

 anfr. Sy^ convexiusculi , ultimus antice deflexus, superne tur- 

 gidus, subtus constrictus, basi inflatus; umbilicus parvus, sub- 

 regularis, pervius; aperlura diagonalis, magna, sinuato-Iunaris, 

 dente parvulo , tenui , obliquo, libero parietis subcoarctata; 

 perist. album , breviter reflexum , marginibus conniventibus, 

 supero subascendente, dextro dente descendente et basali den- 

 ticulo obsoleto munito. — Diam. maj. lOYg, min. 9, alt. 6 mill. 

 (Mus. Cuming.) 



Helix Chiapensis Pfr. in Proc. Zool. Soc. 1856. p. 377. 



— — Pfr. in Malak. Bl. 1856. p. 230. 



Habitat Chiapa reipublicae mexicanae (Ghiesbreght). 



2028. H. bicruris Pfr. 



T. umbillcata, depressa, tenuis, striatula, parum nitida, 

 corneo-lutescens; spira parum elevata; sutura submarginata; 

 anfr. 5 convexiusculi, ultimus antice vix deflexus, basi con- 

 vexior, pone aperturam subconstriclus; umbilicus vix pervius, 

 antice rimaeformis; apertura diagonalis, lunaris, dente libero, 

 longe bicruri parielis coarctata; perist. album, breviter reflexum, 

 margine basali bidentato : dente dextro usque ad marginem 

 superum ascendente. — Diam. maj. 9, min. 8, alt. 4^2 mill. 

 (Mus. Cuming.) 



Helix bicruris Pfr. in Proc. Zool. Soc. 1857. p. 109. 

 Habitat in republica mexicana. 



2029. H. Dysoni Shuttleworth. 



T. umbilicata, subconoideo-depressa , nitida, rufo-cornea, 

 superne plicato-striata, subtus striatula; spira parum elevata; 

 anfr. 5 — Sy^ convexiusculi , ultimus antice vix descendens, 

 superne subangulatus , basi convexus , pone aperturam con- 

 strictus, circa umbilicum latiusculum, pervium vix compressus; 

 apertura diagonalis, rotundato-lunaris, tridentata: dente ] valido, 

 compresso, obliquo, intrante in pariete aperturali; perist. albi- 

 dum, reflexum, dentibus 2 submarginalibus intus munitum. — 

 Diam. maj. 9, min. 8, alt. 43/4 mill'. (CoH. Nr. 1078.) 



Helix Dysoni Shuttl. in Bern. Mittheil. 1852. p. 196. Diagn. n. 



Moll. Nr. 2. p. 16. 



— Dorfeuilleana Pfr. Mon. Hel. I. p. 410. n. 1067. Nec Lea. 



— — Chemn. ed. nov. I. p. 377. t. 65. f. 25 — 28. 



— — Reeve Conch. ic. n. 713. t. 120? (dento 



parietali deticiente. ) 



