﻿R I S S A. 



Pl.ATK XIIT. 



Species 116. (Mus. Watson.) 



RlSSOACORIACE.^. llis. testa parvd,alhi1 , tenui,liru lomji- 

 tui:lt)MUbu.i toMihis niimerosis, eleganter flcmosin, 

 d xtrlis teimissinm fjnralibns sculptd ; anfractibHS 

 (juiiii.i, apicali scmtrotitndo, medianis coneexis, 

 ultimo iiiaijno, subavali ; aperturu subovatd, antice 

 rotunda, posticu acuminata, labia integro, ienui. 



The coriaceous Rissoa. Shell small, white, thin, 

 sculptuvod with longitudinal, tliin, numerous 

 ridges, elegantly flexuons and very fine spiral 

 striiv ; whorls five, apical half-round, middle 

 convex, last large, snbovate ; aperture subovate, 

 rounded anteriorly, acuminated posteriorly, lip 

 entire, tliin. 



aiANZoxi. Proc. Zool. Soc. 187;5, p. :{8;:», PI. XXXVI. 

 f. 27. 



Hah. Santa Cruz, Madeira. 



A light inflated white shell, beautifully sculptured. 



Species 117. (Mus. ?) 



Rissoa (Jeffreysia) opalina. !:!.■>: testa snhghbosd, 

 fusco-rorni'd , diaphaiia, nitriili ; aiifmctibus qua- 

 ternis, aiu'rall sriiiii-nfiniil,!, ilihJnis mrdianis brevi- 

 bus, cniif.n'ssiinis, iilh'iiiii ni,hi,in,ii,jlalo; ajierlurd 

 Sllbratiniila, iiiargiiu' iiitvgrn. 



TriE oi'ALiXK Rkssoa. Shell subglobose, horny-brown, 

 diaphanous, shining ; whorls four, apical halt- 

 round, two middle short, very convex, last large, 

 inflated ; aperture rather rounded, margin entire. 



Jeffreys. Brit. Moll. 



Hab. Channel Islands (littoral.) 



Species 118. (Mus. Brit.) 

 Rissoa (Jepfret.su) diapiiaxa. His. testa parvd, 

 nitenti, fusco-corned, diaphand, subcoiiicd ; spird 

 elevatd, conicd-, obiiisd; anfractibus quinis, gra- 

 datim crescentibus, cmwexis, ullinio subinjlato ; 

 operturd subrotundd, margine fere continuo. 

 The transparent Rissoa. Shell small, shining, 

 horny-brown, transparent, rather conical ; spire 

 elevated, conical, obtuse ; whorls five, gradually 



increased, convex, last rather inflated; aperture 

 rather round, margin nearly continuous. 



Ai.der. ? Forbes and Hanley, Brit. Moll. 



nab. Great Britain. Rare, littoral. 



Si)ocies 111). (Mus. Brit.) 



Rissoa (oina) FASci.vrA. His. testa altd, aciimi-aafii. 

 yailidi: ficlvd, cafttimeo-bifasciatd, flexuosim crebri- 

 nislatd ; aiifractibus septem, declivibtcs ; aperturd 

 .mhtrigund, caiuili amspiciw, labia externa crass<i, 

 rotunda ; columelld brevi, crassd. 



The b.anded Rissoa. Shell raised, acuminated, jiale 

 fulvous, with two chestnut bands, with numerous 

 flexuous ribs ; whorls seven, sloped ; aperture 

 subtrigonal, canal conspicuous, outer lip thick, 

 rounded ; columella short, thick. 



AxGAS. Proc. Zool. Soc. 1851, p. 264.. 



Jlab. New Zealand. 



Species 120. (Mus. ?) 



Rissoa castaxea. li'is. Iisfd elevatd, I eeviga Id, fn 



apir, oh/.s.,; a,</na-i;i,„s .punis, m^rr.riL; 

 ^rrnli/.ns. rlr 



■lata 



alii, 



aprrtin-d s„hjainj.a;„i, margin.: crassi i,seula. 



The ciiKSTXCT Ris.soa. Shell raised, smooth, brown; 

 apex obtuse; whorls five, rather convex, gradu- 

 ally increasing, raised, last rather large ; a])erture 

 rather pyriform, margin rather thick. 



Jeffreys. ? Brit. Moll. 



II,ib. British Islands. 





Species 121. (Mus. Brit.) 



Rissoa (oina) costulata. JUs.trstdparvd^jai.jiaj',, 



svlidd. la,,jil,ai;,nli;irr r,,slald, all.d. s,,/, 

 anfrad'iui msta.,,,;, i ulrrnij'tiin fasriatd : aiijrar- 

 tihus ocUu-is, apiralibiis atlruiiatis, lardianis suh. 

 injiatis ; aperturd parvd, margine tenui. 

 The small ribbed Rissoa. Shell small, piipa-shaped, 

 solid, longitudinally ribbed, white, interruptedly 

 chestnut-banded above the m ddle of the whorls 



