Fe 
D 
_ = 

 ROUSSREON 


PLANCHE 27. 
Classe GASTROPODA (Cuvier 
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- ORDRE Î  Prosobranchiata FamirLEs Cerithiad:æ, Littorinidæ 
SECTION B  Holostomata GENRES Cerithiopsis, Littorina, Fossarus 

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1,2,  Cerithiopsis tubercularis Montagu. 10,11, 12,  Cerithiopsis bilineata Hærnes. 
3, — — var. subulata Wood. 13, 14. 15, 16.117,18, Littorina neritoides Linné. 
4, — — var. obesnla .B. D, D. 19.20,21,  Fossarus costatus Brocchi. 
5, 6,7, 8,9, — mivima Brusina, 92093, - ambiguus Linné. 
Bucquoy, Dautzenberg & Dollfus. 
