﻿RISSOA.— Plate VIII. 



longitudinally ribbed, ribs sliglitly 

 arched, last whorl smooth below ; aperture rather 

 straight, columella thick, short. 



Angus. MS. Brit. Mus. 



Hab. Port Jackson. 



Species 71. (Mus. Brit.) 



RissoA CiNCTA. Eis. (Bissoiiia) testa parva, alba, altd, 

 tcnuiter interriiptim castaneo fafciatd ; anfractibus 

 septeni, convexiusculis, costatif!, costls eleganter 

 flexwosis, interstUiis striatis, ultimo anfradu brcvi, 

 rotundo, subreiiculato. 



The belted Rissoa. Shell small, white, high, finely 

 interruptedly banded with chestnut ; whorls 

 seven, rather convex, ribbed, ribs elegantly 

 flexuous, interstices striated, last whorl short, 

 rounded, rather reticulated. 



Angus. Proc. Zool. Soc. 1867, p. 114 



Hab. Port Jackson. 



Species 72. (]\Ius. Brit.) 



RlSSOA NODICINCTA. liis. (Rissoiua) testa alba, solida, 

 ptjramidatd, acuminata ; anfradibns octo, costellis 

 spiralibus et longitudinalihus regularii er ad angu Ic 

 nodosis oniatis ; apeiiurd semivvatd, labia externa 

 crasso, intiis crenulato. 



The bead-belted Rissoa. Shell white, soHd, pyra- 

 midal, acuminated ; whorls eight, ornamented 

 with spiral and longitudinal ribs, regularly no- 

 dose at the angles ; apertui-e semi-ovate, outer 

 lip thick, crenulated within. 



A. AD.iMs. Proc. Zool. Soc. 1851, p. 260. 



Hab. Isl. Capul, Philippines. 



Species 73. (Mus. Brit.) 

 Rissoa monODONTA. i?/,<.. {Rissoiua) testd brev 

 crassd, lUacind ft alba, subpijfifanni ; aiifradihu 



quinqiie, brevibus, ultimo subovato ; aperturd 

 ovatd, labia externa crasso, subplanulato, calumelld. 

 brevi, unidentatd. 



The single-toothed Rissoa. Shell short, thick, lilac 

 and white, rather pyriform ; whorls five, short, 

 last rather oval ; aperture ovate, outer lip thick, 

 rather flattened, columella short, with a single 

 tooth. 



BivoN. MS. Mus. Brit. 



Bab. ? 



Species 74. (Mus. Sowerby.) 



Rissoa VIOLAcea. Itis. testd parvd, crassd, breviter 

 pijramidatd, iiifrd aurei'-fiilv:!, medio violaced ; 

 anfractibus quinqac, snjirrnr „lhi^, infra castaneo 

 late fisciatis; apcii',;! suit rijuiid ; margine 

 crasso. 



The violet Rissoa. Shell small, thick, shortly pyra- 

 midal, golden brown below, violet in the middle; 

 whorls five, white above, broadly banded with 

 chestnut below ; aperture subtrigonal, margin 

 thick. 



Desmahest. ? 



Hab. Nice. 



Species 75. (Mus. Sowerby.) 



Rissoa reticulata. BLs. {Ris.iaina) testa alba, pyra- 

 midato, tenui, acuminatd ; anfractibus novem, 

 costis teHuissinii.% eleganter Jle.mosis, longiiiulinali- 

 bas et striis spiralihus reticulatis ; aperturd sub- 

 piiriformi, labia externa crasso, antice prodiu-to, 

 cohimolld brevi, infra acuminatd. 



The reticulated Rissoa. Shell white, pyramidal, 

 thin, acuminated ; whorls nine, reticulated with 

 elegantly flexuous longitudinal ribs and spiral 

 strise ; aperture subpyriform, outer lip thick, 

 anteriorly produced, columella short, acuminated 

 below. 



SowEiiBT. Genera of Shells. 



Hob. Isl. St. Thomas, West Indies. 



