﻿RISSOA.— Plate I. 



fractihtis senis, convexiusculis ; aperturd pyri- 

 formi, infra conaKcnlato, lahio cxterno rejlexo, 

 lata, margine interno yrodiicto, tenui. 



BruguiIre's Rissoa. Shell pyramidal, high, white, 

 solid, sculptured with slightly curved ribs and 

 distant grooves; spire produced, pyramidal, 

 whorls six, rather (.'onvex ; aperture pyriforra, 

 channelled below ; outer lip reflected, broad, 

 inner margin produced, thin. 



Pavraudeau. Cat. Moll. Corse. PI. V. f. IT -IS. 



Ih'li, Mediterranean. 



Species 8. (Mus. Marratt.) 

 RlssoA Bryeeea. Riss. (-oina) testa alhd, oblique cus- 



tatd ; spird turritd, elevatd ; anfractibus septenis. 



convexinsculd ; aperturd brevi, pyriformi, snprd 



infruqiw cunaliaulatd. 

 Beyer"s Rissoa. Shell white, obliquely ribbed ; 



spire turrcted, raised ; whorls seven, rather 



convex ; aperture short, pyi-iform, channelled 



above and below. 

 Mo.NTAGU. Test. Brit. PI. XV. f. 8. 

 Hah. West Indies. 



Spe 



AA. K/«.( 



;t,ni;,„ii;h 



u, ventrlr,. 



Mus. Sowerby.) 

 ..:m:,)t,;tninjrif. 



■rrn<t,,tri,s:i,;rnlH, 



■t;h, 



Thk Scalaria Rissoa. Shell pyrifoi-ro. whitish, small, 

 longitudinally ribbed ; spirally very finely striated ; 

 .spire raised, acuminated ; whorls convex, last 

 ventricose ; aperture half-round. 



Adams. ? 



Hah. St. Vincent. 



Species 7. (Mus. Sowerby.) 

 fuA D'Orbignvana. Riss. (-oina) testa turritd. 

 teinii, fnlvo-albidd: sjiird dmnjatd, avfractibns 

 iiovenis, irregulariter rarini^i>:, iiupqualiter eon- 

 I'exiuscidis ; apertnr'i subfriiiniid, supra infrdquf 



]"'"- 



rannlinilatd: labia r.rt.;rnn .ihtiri- aiiijida 

 ducto. 



J)"Orbigny's Rissoa. Shell turreted, thin, whitish 

 fawn ; spire elongated, whorls nine, ii regularly 

 varicose, unequally rather convex : aperture 

 rather trigonal, channelled above and below , 

 onter lip angularly produced in front. 



A. Adams. Proc. Zooi. Soe. 18t>"). ji, tj4. 



Hal. Australia. 



Species !•. (Mus. Sowerby.) 



Kis-^iiA 'nNciNNA. Riss. (-oina) testa albidd, turritd. 

 alfiiisi-uld : anfradibus senis, convexiusculis, te- 

 ,111 it II- castatis, tenuissime spiraliter striatis ; aper- 

 turd majusculd, infra prafuvde. canaliculaid. 



The skat Rissoa. Shell whitish, turreted, rather 

 high ; whorls six, rather convex ; finely ribbed, 

 very finely spirally striated; aperture rather 

 large, deeply channelled below. 



A. Adams. 



Hah. .Japan. 



Spec 



Rissoa 



10. (Mus. Marratt.) 

 Riss. (Alvania) tesid hi 



sah- 



TlI^ 



IISCA. 



pyramidaid, fused, longitudinaliier costafd : .9]iira- 

 liter sulcatd ; costii rotundis, cremdatis ; aifrac. 

 tihus ad suturam angulatis, aperturd snbucald, 

 margine crasso, crenulalo, albo. 

 LITTLE BASKET RissOA. Shell short, rather py- 

 i-amidal, brown, longitudinally ribbed ; spirallj- 

 grooved ; ribs round, crennlated ; whorls an- 

 gular at the suture : aperture rather oval, mar- 

 gin thick, creuulated, white. 



Montagu. Test. Brit. 



•Hah. Britain. 



Another variety is figured on Plate X. 



