﻿RISSOA.— Plate IV. 



Species 35. (Mus. Marrat.) 



RissOA PUSCTtJRA. Bis. {Gingula) testa, ventricosd,fulvd, 

 suhconicd, spiraliter pwnduratu-striatd ; anfradi- 

 hus quinqiie, rotundis, sujird infrdque maculis 

 Unearihus castanets pictis ; aperturd suhrotiindd. 



The punctured Rissoa. Shell ventricose, fulvons, 

 rather conical, spirally striated in punctures ; 

 whorls five, rounded, painted above and beneath 

 with linear chestnut spots ; aperture rather 

 rounded. 



Montagu. Testacea Britannica, Vol. 11. ]). :-;20, PL 

 XII. f. 5. 



Bissoa puadarata, Macgillivray. 



Bissoa approximata, Brown. 



Hah. British coasts. 



Species 136. (Pig- <', '', Mas. Man-at.) 



R1S.SOA PAEVA. Eis. testa coiilcd, loevi,fuli:d, acuminatd, 

 altd; anfradibus rotundis, brevihus, lineis macti- 

 lisque casta7iels, frequenter curvis plerwnque pidis ; 

 aperturd subquadrafd, cohnnclld redii'isculd. 



The small Rissoa. Shell conical, smooth, fulvons, 

 acuminated, raised ; whorls rounded, short, 

 generally painted with chestnut lines and spots, 

 frequently curved ; aperture subquadrate, colu- 

 mella rather straight. 



Maion and Racket. Act. Linn. Soc. VIII. p. 171. 



Bissoa subhitea, Adams. 



Bissoa inierrupta, Johnson. 



Bissoa lactea, Donovan. 



Hah. British coasts and Channel. 



Species 37. (Mus. Hanley.) 



Rissoa Beanil Bis. (Alvania) testd snbcunicd, fused, 

 superiie leviter costatd, omnino spiraliter striata, 

 striis ad castas crenulatis ; spird acuminata ; an- 

 fradibus sex, convexiusculis, ultimo breviiisculo , 

 aperturd subovatd, marrjine distincto, albo ; labia 

 externo albo. 



Bean's Rissoa. Shell rather conical, brown, slightly 

 ribbed above, spirally striated all over, stria? 

 crenulated at the ribs ; spire acuminated ; whorls 

 six, rather convex, last rather short ; aperture 

 rather oval, mai-gin distinct, white ; outei- lip 

 white. 



Hanley. Forbes and Hanley, British Molluscs', III. 

 PL LXXVIII. f. 1. 



Hah. Great Britain and Ireland. 



Species 38. (Mus. ? Copied.) 



Rissoa supracostata. Bis. testd brevi, pallida, ven- 

 tricosd ; avfractibus quinque, rotundis, superioribus 

 acute cusiatis, inter castas striatic ; ultimo magna, 

 ln>vi(jato; spird acuta, subro.sed ; aperturd magna, 

 suhoratd. 

 The upper-ribbed Rissoa. Shell short, pale, ventri- 

 cose ; whorls five, rounded, upper sharply ribbed, 

 striated between the ribs, last large, smooth ; 

 spire sharp, rather rose-coloured ; aperture large, 

 subovate. 



H<ib. Britain. 



This .shell is evidently a somewhat abnormal form, 

 but not of R. parva. Some author, however, having 

 named it, it is here admitted, as it cannot be iden- 

 tified with any known species. 



