28 OLIVA. 



teo diviso ; columella antice rotunda, plicis numcrosis ru- 

 gosa, plicis calli antici duabus, antica striata ; labio tenui, 

 inargine rotundo. — Even more Ancillaria-sliaped than the 

 preceding. 



The following have a thin, homy operculum. 



143. coldmellaris, (f. 348, 349), Soivb. — Oblique ovata, 

 postice acuminata, antice expansa, longitudinaliter partim 

 tenuissime striata, pallide fulvo-plutnbea.fasciispluinbeis latis 

 cincta; spira parva, sutura fusco lineata, anfractu penultimo 

 uno latere valde calloso, balteo albido unifasciato ; columella 

 medio et supra tumide callosa, alba, antice acuminata, unipli- 

 cata, ad marginem prope plicam unidentata ; apertura tortua, 

 postice compressa, angustata, antice expansa, intus fasciis 

 duabus castaneis latissimis picta ; labio postice depresso, 

 subemarginato, incrassato .^Remarkable for the tooth-like 

 swelling on the anterior margin of the columella. 



144. semistriata (f. 850, 351), Gray. — Quam 0. columel- 

 laris magis elongata et postice attenuata, anfractu ultimo 

 postice dimidiatim densissime striato, antice laavigato. — Of a 

 more elongated and posteriorly-attenuated form than 0. co- 

 lumellaris, having the upper half of the last whorl strongly 

 and closely sulcated. 



145. affinis (f. 352), Marrat. — Quam 0. columellaris bre- 

 vior, magis ventricosa ; columella haud tantum callosa. — A 

 rounder shell than 0. columellaris, and has not the callus so 

 much developed. 



146. attenuata (f. 353), Reeve. — Testa parva, tenuis, dis- 

 tanter bifasciata, 0. colamellari similis. — Probably the 

 young of 0. columellaris. 



147. zonalis (f. 354), Duclos. — Ventricoso-subfusiformis, 

 subdiaphana, fascia plumbea, et fascia fusca medio zonata ; 

 spira aperturam longitudine asquanti, pyramidata, ad su- 

 turam rubro-lineata, aufractibus paucis convexiusculis ; co- 

 lumella postice callosa, castaneo unimaculata, antice unipli- 

 cata, obscure unidentata; balteo castaneo unifasciato; aper- 

 tura brevi intus fasciata. — Nearly allied to 0. mutica. 



