﻿II I 8 S A. 



Pl.\tk V. 



Fig. 10 h. 



RiSSOA CALATHISCUS, var. 



(See PI. I.) 



Species 39. (Mus. Sowb.) ' 



RissoA CALATHUS. Itis. (Alvania) testa sulicouicd, 

 pallida, srmipellucidd, cnstis longitudlnalihux, 1 

 suhdistantibus, subdepressis, et liris qiiralihus 

 maijis approximatis, interstitUji profundi foceolatis, 

 cancellatd ; aitfractibw qvinquc roin-exlnsculis ; 

 apertiird suhmatd ; hihlo e-rterno cra.^sn, intiis 

 '■rcnafo. 



Thk hasket Ri.^sOA. Shell rather couical, pale, semi- 

 pellucid, cancellated with rather distant, rather 

 depressed longitudinal ribs and rather nearer 

 spiral ridges, with deeply-pitted interstices ; 

 whorls five, rather convex ; aperture rather 

 ovate, outer lip thick, crenated within. 



FoEBES and Hani.ey. British ]\Iollnsca, Vol. HI. p. 

 80. 



Hah. British coasts and Europe gorierallj. 



Species 40. (Mus. Sowerby.) 

 RiSSOA STRIATA. Ris. (Aiwhu) testd albtdd, eloiigatd, 

 tfiimiter spiraliter striata ; anfracllbiis sex, conre.vis, 

 elevatis, snperne ad sidvram crenulatis, ultimo 

 hrfvi ; aperiurd parvd, labia externa extits vari- 

 coso, margine incrassato, suhcremdato. 

 The STRIATED RissOA. Shell whitish, elongated, finely 

 striated spirally ; whorls sis, convex, raised, 

 crenulated above at the suture, last short ; aper- 

 ture small, outer lip varicose without, margin 

 thickened and slightly crenulated. 



Montagu. (Turbo) Test. Brit. Vol. II. p. 326, Pl.XIII. 



f. 25, 20. 

 Eissoa ininutissima, Midland. 

 Eissoa comiauiti)), Forbes. 

 i?/,<.svirt grarills, Macgilli\Tay. 

 Hah. Britain. 



Species 41. (Mus. Marrat.) 



Rlssoa ve.vteosa. Ei^: testd stibriridi, fiili'escenti, 

 pyramidaid, spird elevatd ; anfractibus qiiinque, 

 lati'raliter comprcssis, ultimo rotmido, fere umbili- 

 rato, aperturd subovatd, margine amto. 



The inflated Rissoa. Shell rather greenish-buff", 

 pyramidal, spire elevated ; whorls five, laterally 

 compressed, last round, nearly urabilicated ; 

 aperture rather oval, margin acntc. 



MoxTAon. (Turbo) Test. Brit. II. p. 317, PI. XTI. f. 1;^ 



Eissoa aruta, Draparnaud. 



Turbo ventricosus, Dilhvyn. 



Eab. Great Britain, France. 



Species 42. (Mus. late Deshayes.) 

 Rissoa rosea. Eis. testd solidd, rosed, spird elevatd, 

 anfractibus septem, moderate convexis, Imigiiudin- 

 aliter costatis, costis regwlarihis, solidis, leevibus, 

 rectiihcHlis, interstitiis cequantibus ; aperlnrd 

 aurifurmi, columella leviter uniplicatd, Idbio ex- 

 terno crasso, rotundo. 

 The pink Rissoa. Shell solid, pink, spire elevated ; 

 whorls seven, moderately convex, longitudinally 

 ribbed, ribs regular, solid, smooth, rather straight, 

 equalling the interstices ; aperture auriform, 

 columella slightly single-plaited, outer lip thick, 

 rounded. 



