110 TIELIX §. 21. 



tilioribus munitus; apertura parum obliqua, parvula , lunato- 

 circularis; perist. simplex, rectum, marginibus conniventibus. 

 — Diam. maj. 3%, min. 31/3, alt. IV2 mill. (Coll. Nr. 216.) 

 Helix zeta Pfr. in Proc. Zool. Soc. 1851. Dec 

 _ _ Chemn. ed. II. Helix N. 1040. t. 135. f. 57 — 30. 



Habitat in Nova Seelandia (Strange), 



* 



495. ziczac Gould. -J- (Proc. Bost. Soc. -1846. p. 166; 



Exped. shells 1831. p. 41. f. 44.) Mon. I. p. 116. 



490. tessellata Miihlf. (Coll. 217. — Chemn. ed. 



nov. II. p. 133. — PaUila Alh. p. 65. — Helix 



contortula Fer. Mus. , Desh. in J"er. hist. I. p. 89. 



N. 121.) - - - 117. 



497. epidermia Anton. (Coil. 218. — Chemn. ed. 



nov. II. p. 133. — Patula Alb. p. 65.) - - - 117. 



498. H. spirorbis Deshaycs. -J- 



T. minutissima, orbiculato - discoidea, depressa, alba, 

 translucida, substriata, late umbilicata; spira plana; anfr. 47^ 

 convexi, sutura profunda separati; apertura rotundato-semi- 

 lunaris, simplex, marginibus simplicibus, acutis. — Diam. 4, 

 alt. IV2 mill. (Dh.) 



Helix spirorbis Desh. in Fer. hlst. I. p. 83. N. 109. 

 Habitat prope Rio Janeiro (Gaudichaud). 



499. H. rivularis Krauss. 



T. umbilicata, depressa, tenuis, utrinque confertim costu- 

 lata, sericea, pellucida, corneo-fusca; spira planiuscula; anfr. 

 4 convexiusculi, sensim accrescentes, ullinuis antice non de- 

 scendens, basi convexus; apertura subverticalis, rotundato- 

 lunaris; perist. simplex, rectum, marginibus conniventibus, 

 columellari brevissime patente. — Diam. maj. 3^2, ni'n. 3, alt. 

 IV4 mill. (Coll. Krauss.) 



Heiix rivularis Krauss sudafr. Moll. p. 77. t. 4. f. 25. 

 — — Pfr. in Zeitschr. f. Malak. 1848. p. 114. 



Habital ad fontem fluvii Mooi, Natal Africae meridionalis. 



Obs. Persimilis H. saxicolae Pfr. (cubensi), spira plana statini ctt- 

 stinguenda. 



* * 



500. H. Shuttlcworthi Pfr. 



T. minuta, umbilicata, depressa, tenuis, laevigata, pellu- 

 cida, cornea; spira exigua, profunde inmiersa; anfr. 3, ulti- 

 mus magnus, rotundatus; umbilicus minutus, non pervius; 

 apertura parum obliqua, anguste erecto-Iunaris; perist. simplex, 



