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PLANCHE 26. 
Classe GASTROPODA (Cuvier 

— “>> 
ORDRE [1 Prosobranchiata Faire Cerithiad:æ 
SECTION B Holostomata Genres Bittium Triforis, Cerithiopsis 

1,2, Bittium lacteurm Philippi. 12, Triforis perversus Lin, var. bicolor M onterosato 
3,4,  — — var. lutea .B. D. D. 13,  — — — (type) 
lLE6, — — var. tessellata .B. D. D. 18, 19 20, — — var, obesula Monterosato 
| 8,9, 10, 11, 14, 15, 16, 17, Triforis perversus Linné 21, 22, 23, 24, 25, 26, 27, Cerithiopsis Metaxae 
a var. adversa Montagu. .Delle Chiaje, 
Bucquoy, Dautzenberg & Dollfus. 
