﻿RISSOA.— Plate V. 



Deshates. Concb. He dc la Reunion, p. 61, PI. VII. 



f. 29. 

 Hal,. Isle of Bourbnn. 



Species 43. (Mus. hite Deshayes.) 



RissOA in;<olita. Eis. {Alvania ?) testa minima, 

 Candida, ctongato.tiirntd, apice ohtiisiiiscnU ; 

 anfractuous s,y,/,„;s, cnstis dual, us i,,,: .j„„IihHs 

 pr'oemitc ,fh'l,i:.< rmrtis, i,i,fjnrc j-r"j" siihir.nii I'O^ifd, 

 elegantcr ijraiinfn.rrriinliitn ; ultimo miji-ai-ln hrevi- 

 usculo, transversim quadrieostato ; aperturd m iiiimd, 

 rmatd, angustd. 



The extraordinakt Rissoa. Shell very small, wliite, 

 elougate-turreted, apex ratlier obtuse; wborls 

 seven, girt with two unequal prominent ribs, the 

 larger placed near the suture, elegantly granu- 

 larly crenulated, last whorl rather short, trans- 

 versely four-ribbed ; aperture very small, oval, 

 narrow. 



Deshayes. Conch, lie de la Reunion, j). GS, PI. XIII. 

 f. 1.5, 10. 



;/",(/.. Isl. Bourbon. 



Species 44. (/, a, I), Mus. Crosse ?) 



RissOA GENTILISSIANA. U/.5. (Hi/drohia) testd parvd, 

 pallidi:fulvd, Icevi, ovatd, apice ohtuso ; an/ractihiis 

 quatuor, convexiasculis, ultimo elongato, inflato, 

 subsoluto ; a^'ertiird diyunctd, ohlique ovatd., 

 opercnlo fusco. 



The family-eelation Rissoa. Shell small, pale ful- 

 vous, smooth, with obtuse apex ; whorls four, 

 rather convex, last elongated, inflated, a little 

 uncoiled ; aperture disjoined, obliquely ovate. 



Crosse. Journ. de Conch. Vol. XXIJ. p. 11:!, I.s7-t. 



Hal). New Caledonia. 



Mr. Crosse remarks that this is the second of the 



same genus found in the localitj'. 



Species 45. (Mus. Souverbie ?) 

 Rissoa fimbeiata. Uis. (Itissoina) testd uVndd, ttir- 

 rltd, altissiuid, lavi, aqdce ohtuso; a>ifradiljas octo, 



lateraliter compressis, distanter longitudinaliter 

 cosiafis, prop'e suiuram suhangtdatis ; aperturd 

 oUique ovatd, colwnelld duplirjitd, lahio externo 

 dnplieato, fimhriato. 



The fringed Rissoa. Shell whitish, turretcd, very 

 high, smooth, with blunt apex ; whorls eight, 

 laterally compressed, distantly longitudinally 

 ribbed, with a slight angle near the suture ; 

 aperture obliquely ovate, columella doubled, 

 outer lip doubled, fringed. 



Souverbie. Journ. de Conch, p. 52, 1872. 



Hah. New Caledonia. 



Species 4tj. (Mus. Souverbie ?) 



Rissoa iscerta. Bis. (Eissoina) testd fused, solidd, 

 altd. tiirriu'i, Sjdid ih mfd. apice ohtuso; anfracti- 

 hus nrl.i. ml .-■"hirfini inHjtilatis, costatis, costis ad 

 sqiiraui ci'iitiiuiis, distMitihus, roiundis, ad medium 

 ultimi aiifractas discontinuis ; apeHurd nUique 

 ovatd, columella arenatd. 



The uxcektain Rissoa. Shell brown, solid, elevated, 

 turreted, spire raised, with obtuse apex ; whorls 

 eight, angular at the suture, ribbed, ribs con- 

 tinued at the spire, distant, rounded, discontinued 

 at the middle of the last whorl ; aperture 

 obliquely ovate. 



SonvEEBiE. Journ. de Conch. 1872, p. 33, PI. I. f. 4. 



Hab. Ins. Arl. New Caledonia. 



Species 47. (Mus. Marrat.) 



Rissoa fulcheeeiiu. Eis. (setia) testd miniUd, hrevi, 

 glohosd, loivi, suhumhiUcatd, in seriehus tribtis 

 macuUs ruhro-fuscis quadratis ornatd; anfractilms 

 quatuor, rotundls, ultimo magno, ventricoso ; aper- 

 turd rotundd, margine simplici. 



The very peetty Rissoa. Shell minute, short, 

 globose, smooth, slightly umbilicated, ornamented 

 with red-brown square spots in three rows ; 

 whorls four, rounded, last large, ventricoso ; 

 aperture round, margin simple. 



Jeffreys. Ann. Nat. Hist. Vol. II. p. 351. 



Hah. Channel Islands. 



