PELLA-PHASIS. 135 



ZINGIS Martens, a group of Zonitidce, contains H. natalensis Pfr. 

 (vide Pilsbry, Proc. Acad. Nat. Sci. Phila. 1889, p. 279, pi. 9, figs. 

 H, i), cotyledonis Bens., trotteriana Bens., phytostylos Bens., and pos- 

 sibly some other species, Ancey's name Sheldonia is a synonym? 



H. hudsonice Bens., belongs to Gallandia Bgt., a group usually con- 

 sidered a section of Vitrina. The relations of this extensive group 

 of globose Vitrinoid snails of South Africa urgently need investiga- 

 tion, but the soft parts only can give a clue to their affinities. 



LEJEANIA Ancey, containing the thin, perforated species from 

 Abyssinia, such as H. darnaudi Pfr., isseli Mor., isselliana Nev., 

 jickeli Nev., lejeaniana Bgt., achilli Bgt., d' hericourtiana Bgt., etc. 

 This group is hardly separable from Fruticicola. 



NATALINA Pils. (= Aerope Alb., not Leach), a genus of Rhyti- 

 didce, consisting of agnathous forms having an umbilicated globose 

 or depressed shell, plicate-striate above, polished beneath. This 

 genus contains, besides its type, H. caffra, the following species : 

 H. knysnaensis Pfr., vernieosa Kr., tremeni Melv. & Pons., eumacta 

 Melv. & Pons., dumeticola Bens., cosmia Pfr., ampliation Bens. 

 (A.nn. Mag. (3) xiii, p. 494), and perhaps Helix (Macrocyclis*) oceno- 

 tera and liparoxantha Melv. & Pons. (Ann. Mag. N. H. 1892, p. 

 238). The anatomy is described and illustrated in my papers in 

 Proc. Acad. Nat. Sci. Phila. 1889, p. 277, and 1890, p. 41. 



Besides these, H. cyclaria Morel, and one or two other species 

 belong elsewhere. When these are eliminated, we find that we have 

 two groups of species remaining, one typified by H. bisculpta, the 

 other by H. menkeana. These groups will now be considered in 

 detail. 



Genus PHASIS Albers, 1850. 



Phasis ALB., Die Hel. p. 92 (1850), type and only species H. 

 menkeana Pfr. Not Phasis Walk., Cat. Lep. Het. B. M, ii, p. 312 

 (1854). 



This group consists of umbilicated shells of solid, opaque texture, 

 chalk-white with or without brown bands, the lip simple, dilated at 

 the umbilical insertion ; apical whorl corneous or dark. Of the 

 group I have seen only menkeana Pfr. and eapensis Pfr. ; but uiten- 

 hagensis Kr. and paludicola Bens, apparently belong here also. 

 The shells look like Xerophila. 



