﻿RISSOA.— Plate II. 



Thr oiedle Rissoa. Shell pyramidal, smooth, or 

 slightly spirally striated, fulvous, three-banded 

 with chestnut; whorls five, a little ronnded ; 

 aperture small, columella strong, outer lip blunt- 

 edged. 



Montagu. Testacea Britannica, Vol. II. p. 35-7. 



Bijison vitfafa, Donovan. 



Bissoa nijK'sfris, Forbes. 



TLih. Britis 



^lifer 



Species 16. (Mus. Sowerby.) 



Rissoa striatula. 



;! ui 



trsfa alha, In 



iiti'r costas hmgi- 

 (juafuor, ultimo 

 lo, siipfrne pro]ie 



hnmlato 



"1' 



rtii.-a hr 



h>h:« rrr,n,h,l,K 



The little striated Ris.soa. Shell white, short, 

 spirally, prominently, and distantly ribbed, lon- 

 gitudinally striated between the ribs ; whorls 

 four, last large, finely ribbed at the middle, an- 

 gularly flattened above near the suture ; aper- 

 ture short, lip crenulated. 



Mo\TA,;u. Testacea Britannica. Vol. II. p. :>0(), 

 PI. X. f. 5. 



Turbo cariiiaiux, Da Costa. 



Turho moniUs, Fleming. 



Hah. British coasts. 



Beautifully sculptured with thread-like striie cro.ss- 



ing prominent keel-like spiral ribs. 



Species 17. (Mus. Sowerby.) 



Rl'^SOA SPIRATA. i?;>. {TUssnhiii) testa alhi'i, turr'tfa, 

 upt'raliier teiiiii'i'i- strinlo : aiifrorlihus n cm,), see 

 suivnorihus ;-,vr//.-'>- ahnij.tr rrrsi.s (rpicmi am. 

 viiuotum acclirilns, ],.,..j;t ,i,i: nnlilrr orslntU, in- 

 l,Ns ivfrriorlhtis ,'l,-n,t,-s. I.rrn'.ridls sidH-ijIunJ ra. 

 O-is; siifiin! jiriifiiiiilr iiirisd ; aperturd siihjiijri- 



Tni-Nii. Iillil'n I'.iii run r.,'j„r,isO crassi I'lSCUl 0. 



The .si>n;Ei. Rlsm.a. Shell white, turreted, spirally 

 finely striated ; whorls nine, six upper short. 



abruptly sloped towards an acuminated apex, 

 longitudinally ribbed, three lower raised, rather 

 smooth, subcylindrical ; suture deeply incised : 

 aperture rather pyriform, outer lip expanded, 

 rather thick. 



Sowerby. Genera of Recent and Fossil Shells. 



Huh. Philippines. 



Species 18. (Mus. Sowerby.) 



Rissoa pboxima. Ris. tivtd <i1hi1,iniiiiitd,ti;iiui,iivato. 



oU,„i,jd, sph-alifer ilnisr siriafd : a„fract;hvs 



ijuiiiqw, iiijfdiis, (jriidatim cresci-iitilus : apfrturd 



oratd, margine acuta, .ihnplici. 

 The APPROXIMATE Rissoa. Shell white, minute, thin. 



ovate-oblong, spirally closely striated ; whorls 



five, inflated, gradually increased : apertnre 



ovate, margin simple. 

 Alder MS. Thomson, Ann. Nat. Hist. Vol. XX. 



p. 174. 

 Bissoa vir</iiif(i, Brown. 

 Hab. Ireland, very rare. 



DiSering from Bissau ritroa in being striated spi- 

 rally and in the ]irn]iortionate equality of increase in 

 the whorls. 



5pecies 19. (Mus. 



Copied.) 



Rissoa vitriea. Bis. testa pjai'vd, alia, tenui, semi- 

 prlJuchld, ovato-ohlmic/d, laevigata; anfractibus 

 rpu'vqui', inftatis, pemdtmo magno elfrafo ; aper- 

 turd ocatd, margine acuta, simplici. 



The glassy Rissoa. Shell small, white, thin, semi- 

 pellucid, ovate-oblong, smooth ; whorls five, in- 

 flated, the last large, elevated ; aperture ovate, 

 margin sharp, simple. 



Montagu. Testacea Britannica. Vol. II. p. 351. 



Bissoa. gJabrata, Megherle. 



Rissoa crystaJUna, Brown. 



Hrdi. Exmouth, Oban, &c. 



The penultimate wl 

 .) the others. 



is very large in proporti 



