118 MURICID^. 



tinged with orange along the margins and dotted with white, the 

 dots crowded anteriorly and becoming more and more remote 

 posteriorly. The operculum is of a pinkish violet color. The 

 foot has a well-developed duplication in front. Such is the 

 description given by Mr. W. H. Pease, who places the species in 

 Rhizochilus proper ; but it appears to me to differ from that genus 

 in the excavated, shelf-like columella, the expanded continuous 

 lip o.f the adult (very like Concholepas) and in not closing up 

 its aperture with shelly matter when mature. In the expanded 

 lip, flattened columella and tooth-like pi'ojection of the basal 

 margin of the latter it well agrees with Hupe's genus Graleropsis, 

 a tertiary fossil. 



Separatist A, Gray. 



Sy7i. — Lippistes, Montf. 



Distr. — 4 sp. Cape, Philippines, Poljaiesia. S. Chemnitzii, 

 A. Ad. (xliv, 36). 



Shell turbinate, subdiscoidal, the first whorls contiguous, the 

 last more or less separated ; aperture expanded, slightly angu- 

 lated, the margin everted ; umbilicus very wide, infundibuliform 

 with the whorls visible to the apex. No operculum. 



The animal is unknown, and the relationships of the genus 

 are doubtful. 



Melapium, H. and A. Adams. 



Distr. — 1 sp. East Indies. 



Shell ovate-pyriform, ventricose, imperforate, porcellanous ; 

 spire very short, apex papillary ; aperture expanded, inner lip 

 with a thick, smooth callus at the hind-part, columella twisted 

 anteriorly, with a prominent oblique plait ; canal wide, recurved, 

 directed towards the left. Operculum unknown. 



This genus was instituted for the Pyrula lineata of Lam. (xlv, 

 50) ; the animal and operculum of which are unknown. Its 

 systematic position is very doubtful. It has the porcellanous 

 texture of Pusionella ; from which, however, it is distinguished 

 by its ventricose body-whorl and short papillary spire. 



whitneya, Gabb. This fossil group is said by its author to be 

 related, probably, to Fasciolaria, but I agree with Stoliczka that 

 its nearest apparent ally is Melapium ; from which I can only 

 separate it geologically. M. ficoides, Gabb. Cretaceous ; 

 California. 



Rapa, Klein. 



Syn. — Bulbus, Humph. Rapella, Swn, 



Bistr. — 2 sp. Indian Ocean to Polynesia. R. papyracea, 

 Lam. (xlv, 51). 



Shell thin, globosely pyriform ; axis perforate ; umbilicus 

 partly concealed by the reflected inner lip ; spire obtuse ; aper- 



