﻿R I S S A. 



Plate IV. 



Sjjecies 30. (Mns. Sowerby.) 



Ris.-^OA FORTIS. — Eis. {Bissoina) testa alhidd, crassd, 

 angustd, elevatd, medio tumidiusculd, eostis rectis, 

 crebris, loivibus, sculptd; anfradihus septem, altis, 

 plaimlatis; apiceacuto; apertiird parvd, ohliqud, 

 anyiigta, inj'rd caHalicidatd ; lahio inierno crasso, 

 expanno. 



The strong Rissoa. Shell whitish, thick, narrow, 

 raised, rather tumid in the middle, sculptured, 

 with straight, close, smooth ribs ; whorls seven, 

 high, flattened ; apex sharp ; ajicrtnre small, 

 oblique, narrow, channelled IhKiw ; outer lij) 

 thick, spread. ' 



C. B. Adams. 



Ilah. Jamaica. 



Species 31. (Mus. r) 



RlSSOA MACULATA. liis. tcstd vu'nufd, suhtrocJiif<irmi, 

 loBVUjatd, fiilvd ; aiifractihus si\e, rolnaditi, ulthno 

 macuUs suharcHatis versus suluritm, fidiqiiadrdtis 

 irifni, et fascia spirali casfa-neis pictd ; uperlard 

 maj I'lscidd, labia iiiterno rejlexo. 



The si'Otted Rissoa. Shell minute, .subtrochiform, 

 smooth, brown ; whorls six, rounded, the last 

 painted near the suture with spots slightly curved, 

 below rather square, and a spiral band of chestnut; 

 aperture rather large, inner lip reflected. 



Soweebt. Index of British Shells, as of an nnnanied 

 authority. 



Bissoa ivcouspirua, var. auctorum. 



Hdb. Britain. 



The pattern of colouring is so distinct that it may 



justify specific designation. 



Species 32. (Mus. Marrat.) 



Rissoa CRENULATA. Iti---. testa alhd, h,rfi, turritd, 



qnadratiin cain-cIJatd ; aiifractihus siiperiie jtmpe 



sidiiram ancjidatis, pemdtiino veniricoso, vlfiiuo 



magna ; apeiiurd ovntd, marrjine e.vfcnio creiinhilo. 



The ceenulated Rissoa. Shell white, short, tur- 



rated, cancellated in squares ; whorls angular 



above near the suture, penultimate ventricose. 



last large ; aperture ovate, onter margin creim- 



lated. 

 MiCHAi'D. Nouvelles Especes de Rissoa, p. 15, f. 1, 2. 

 Turbo cancellatas. Da Costa. 

 Turbo cimex, Donovan, &c., non Linnaus. 

 Hah. Britain and Channel Islands. 



Cancellations broad, but not so much so as those of 

 Zetlandica. 



Species 33. (Mus. Marrat.) 



Rissoa ki-kilahijis. liis. (Alvaiiia) tcstd tmclujormi, 

 fulvd, ad suturam rufolineatd ; anfradihus angu- 

 latis, supra angidmn disianter, levitcr costatis ; 

 apice acuminata; apcrtnrd sutitrigond, marginc 

 rubra vcl violacea. 



The hed-lipped Rissoa. Shell trochiform, fulvous, 

 with a red line at the suture ; whorls angular, 

 distantly, slightly ribbed above the angle ; apex 

 acuminated ; apertui-e rather trigonal, maigin 

 red or violet. 



Leach. (Alvania) Alder. Ann. Nat. Hist. Vol. XIII. 

 p. 325. 



Bissoa hyalina, Dcsmonlius. 



Rissoa lilacina, Recluz. 



JJali. Europe. 



Species 34. (Mns. Hanley.) 



Rissoa inconspicua. E/.v. {Cimjidn) trMd conicd, 

 tievatd, alhidd, loiigltudinalllr,- cushiJd, inter castas 

 taiiiissiiHi strl,<td ; anfradihus se.r, latrralilcr suh- 

 r<i,,,j>i: s<,'s : njdce obtuse; tdtimn aifracti' iifr,) 

 lacijiitd; api rturd magna; colunielld ndi i'Sinihi. 



The inconspicuous Rissoa. Shell conical, raised, 

 whitish, longitudinally ribbed, very finely striated 

 between the ribs ; whorls six, rather compressed 

 at the sides ; apex obtuse ; last whorl smooth 

 below; aperture large; columella rather straight 



Alder. Ann. and Mag. of Nat. Hist. Vol. XIII. p. 

 323, PI. VIII. f, 0, 7. 



Hah. Britain. 



