﻿lUSSOA. 



Pi.ATi; Vll. 



Species "p?. (.Mus. Paris.) 



RlSSOA MullKENSTEUNl. liin. (lunsoiiia) Udd miiiiiiui, 

 alba, ovato-2ii/riimiclatd, ajjice acuta ; aiifradlbns 

 septem, convex! ihculis, luHyitudlnalUer costellatis, 

 slriis apiraUbtis decussatis; uHimu aiijractii ynaijno, 

 veutricoso, siibovato ; aperlard semilauari, labia 

 externa crasso, aniice prudiicto. 



Mourenstern's Rissoa. Shell very small, -white, 

 ovately pyramidal, with acute apex ; whorls 

 seven, rather convex, longituiliiially ribbetl, 

 decussated with spiral strite ; last whorl large, 

 veutricose, subovate ; aperture semilunar, outer 

 lip thick, anteriorly produced. 



Deshayes. Conchyliologie de I'lle de la Reunion, 

 p. 0-2. 



Hub. He Bourbon. 



Species TiH. (Mus. Brit.) 

 RlSSOA SEMIGLABRATA. liis. (Eissoiita) tesid pijriforml, 

 salidd, acuminata, anfraciibus septeyn, coiivexiiis- 

 ciilis, siqiei-iaribus curricostafis, jienuUimo et ante- 



■liliill(tis.<iiili^ hnnliiliihinllihlHi ili rii.<.<ali.s, ultimo 



ilitii, iij'riiurii injrijitrjiii, liibio externa 

 Iraiifevrsis tiibnx eel qaatuor 



s.b^b.b.,.,.^., 

 crasw, deiitibtis 



The halk-polished Ri.ssoa. Shell pyriform, solid, 

 acuminated, whorls seven, rather convex, the 

 upper with curved ribs, two before the last 

 decussated with indistinct spiral ribs and very 

 minute longitudinal striie, last rather globose, 

 polished, apertui'e pyriform, outer lip thick, 

 provided w'ith three or four teeth. 



A. Adams. Proc. Zool. Soc. 1851, p. '27'J. 



Hub. Isl. Zebu, Philippines. 



Species !JiK (Mus. Brit.) 

 RlSSOA CEASSILABRCM. lu'f. {L'lfSua) testa bi 

 conicd, laded, politd, .-■iilid<!, (iiifraclibi(S 

 planulatis, apice acuniinatu ; ajiertuni jii/rifu 



aiigustd. labia cxfenio crasso, planalalu. aatici 

 tridn,tat„, eolnmelhl lata. 

 The THicK-LiPi'ED KissoA. Shell short, conical, milk- 

 white, polished, solid, whorls six, flattened, apex 

 acuminated; aperture pyriform, narrow, outer 



lip thick, flattened 



mella broad. 

 Pease. Proc. Zool. Soc, 

 Hab. California. 



rly tridentate, 



A eorio 



ittle shell with three strong teeth ; 

 fk, outer lip. 



Species 60. (Mus. Brit.) 



RlSSOA CANALICULATA. liis. (Kissoilia) testa snliilii. 

 ptjraiiiidatd,pallidlssimeftdvd, anj'rartiliKs si'iifi',,,. 

 convexiiisculis, coitatis ; castis ilixlaiitilms, lo i-il,n.<. 

 media Jlcxuosis, ad costam sjiiralein tiasalmt <ei- 

 iiiiiiantil/us ; ultimo anfractiL infra bicustatu ; 

 aperturd pyrifarmi, labia externa crassa. 



The CHANNELLED RlSSOA. Shell solid, pyramidal, very 

 ])ale fulvous ; whorls seven, rather convex, 

 ribbed ; ribs distant, smooth, flexuous in the 

 middle, ending at the base, last whorl double 

 ribbed beneath; aperture pyriform, outerlipthick. 



Schwartz. Monogi-aph of Rissoinae. 



Ilab. Philippines. 



Sjjecies 61. (Mus. Brit.) 



RlSSOA INSIGNIS. Bis. (Uissoina) trsti! 

 siipenie alba, infra subaured : a nfrar 



snjn 



irihlis lati: 



dnii:^ 



anijiil.itis, rnstalis. siih.lerHssafis, alliiiin ,v 

 subijlobasa ; aperttird siiboratd, labia t 

 crassa, rotunda, denticulato, columella crassi 



The wonderful Rissoa. Shell short, solid, 

 above, rather golden below ; whorls five, 

 broad, square, rectangular near the .« 

 ribbed, slightly decussated, last round 

 globose; aperture subovate; outer lip 

 round, denticulated, columella thick. 



Adams and Reeve. Voy. Samarang. 



Hab. ? 



tniah. 

 xtera, 



