MOLEUSQUE 

DU ROUSSIEEON 
Planche 34. 
Classe CASTROPODA (Cuvier.) 

ORDRE L  Prosobrancaiata FAMILLE : Littorinid.:e 
Secrion B. Holostomata GENRES : Riissoina, Rissoa 

T2: 04; Riss ina Bruguieri Payr.udezu. 
FA 2 = —= (uveais) 
6, 7, 8. 9, Rissoa auriscalpium Linné. 
10, —_ — — var. expansilabris B. D. D. 
IT; = — — var. fussa B. D. D. 
12, 13, =E — — var. acicula Risso. 
14, = == — var. pulchella Risso. 
19 N10) T7; —_ 
monodonta Bivona. 
18, 19, 20, 21, 22, — violacea Desmarest. 
Bucquoy, Dautrenberg & Dollfus. 
