CYRTOCHILUS-HELIX. 3 1 1 



broad bands above and one below the periphery, deflexed in front. 

 Aperture half round, oblique ; lip broadly reflexed throughout, 

 dilated and adherent at the columellar insertion. Surface smooth- 

 ish. Type H. chaixii Mich., pi. 71, figs. 61, 62. 



This group differs from the pentateeniate Helices in having the 

 lip more reflexed, and not forming a columellar plate. I think 

 it allied more to the " Campylseas," with which it agrees in the color 

 pattern (distinctly visible in specimens before me) and the general 

 features of the aperture. I consider Tacheocampylcea the most 

 nearly allied group of the recent fauna (conf. pi. 43, figs. c3-35). 

 The resemblance to Mesodon is merely superficial. It is likely that 

 H. brocchii Mayer from the upper Pliocene belongs here rather than 

 to Galactochilus. It is umbilicate and one-banded above ; but I 

 have not seen that species, nor H. ludovici Noul. and ornezanensis 

 Noul. from the Miocene freshwater chalk of southwestern France, 

 which may also find a place in this group. The type, H. chaixii, is 

 from the middle Pliocene of Hauterive. 



Genus (?) CYRTOCHILUS Sandberger. 



Oyrtochilus SANDB., Land u. Susswasser Conchyl. der Vorwelt, p. 

 386 (for H. expansilabris&andl).'). Not Cyrtochilus Jak., 1875, or 

 Meek, 1876, nor Cyrtochila Feld, 1874. 



Shell globose-conoid, with 5 convex whorls separated by linear 

 sutures, the last whorl large, ventricose, broadly constricted behind 

 the lip; surface of all but first whorl obliquely costulate and deco- 

 rated with minute papillae arranged in quincuncial order. Aperture 

 oblique; outer and basal lips expanded, columella narrow, vertical, 

 closing the umbilicus. Type H. expansilabrts Sandb., pi. 71, fig. 

 50. 



The 'shell has the figure of H. platychela of Sicily, but it is 

 sculptured like a hairy Chilostoma. The single species is from the 

 lower Miocene of Hochheim. 



Genus HELIX Linne, 1758. 



Helix LINNE (in part), Syst. Nat., x, p. 768. LAM., Syst. Anim. 

 s. Vert., 1801, p. 94, H. pomatia on\y.-{-Pomatia, Tachea> Otala, 

 Macularia, Iberus, Eremina, Euparypha, Hemicycla, etc., etc. 



See for anatomy A. SCHMIDT, Der Geschlechtsapparat der Sty- 

 lommatophoren in taxonomischer Hinsicht, in Abhandl. naturwis- 



