118 MURICID A. 
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 
RKhizochilus proper; but it appears to me to differ from that genus 
in the excavated, shelf-like columella, the expanded continuous 
lip of 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 projection of the basal 
margin of the latter it well agrees with Hupé’s genus Galeropsis, 
a tertiary fossil. 
SEPARATISTA, Gray. 
Syn.—Lippistes, Montf. 
Distr.—4 sp. Cape, Philippines, Polynesia. S. Chemnitzit, 
A. Ad. (xliv, 36). 
Shell turbinate, subdiscoidal, the first whoris 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. 
Meapium, H. and A. Adams. 
Distr.—l 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. MM. ficoides, Gabb. Cretaceous ; 
California. 
Rapa, Klein. 
Syn.—Bulbus, Humph. Rapella, Swn. 
Distr.—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- 
