202 helicinje. 



marginata, Mull. rota, Brod. 



Moricandi, Sow. scrobiculata, Pfeiff. 



parmula, Brod. zebra, Pfeiff. 



planulata, Lam. zonalis, Ferus. 



quadrifasciata, Le Guillou. zonaria, Linn. 

 Reeveana, Pfeiff. 



Sub-gen. semicornu, Klein (Chloritis, Beck). 



Shell rather solid, perspectively umbilicated, depressly globose, 

 concave on both sides ; spire involute, the last whorl tapering, 

 descending anteriorly ; peristome somewhat thickened, the right 

 margin expanded, the basal rather reflexed. 



circumdata, Ferus. unguicula, Ferus. 



Gruneri, Pfeiff. ungulina, Linn. 



Sub-gen. erigone, Albers. 



Shell widely umbilicated, depressly globose, thin, diaphanous ; 

 spire flat, last whorl ventricose ; peristome widely expanded, 

 the margins united, the columellar dilated, patent. 



discordialis, Ferus. quieta, Reeve. 



Genus MACROCYCLIS, Beck. 



Shell thin, widely umbilicated, depressed ; whorls rapidly 

 increasing, the last inflated at the aperture and deflexed ; 

 aperture roundly oval ; peristome simple, thin, the margins 

 approximated, the basal shortly reflexed. 



Ex. M. pulchella, Miiller, pi. 78, fig. 1. Shell. M. 

 laxata, Ferussac, fig. 1, a. 



The species of Macrocyclis, as restricted, are from Chiloe, 

 V aldivia, and Australia ; while those of the sub-genus Ampe- 



