PLATE XL VII. 



Fig. 1. — Biddulphia luicnsa Maun fzoiial view). Enlarged rrl't diameters. Description^ p. 302. 

 Fig. 2.~Blddulphin externa Munn (valval view) . Enlarged 57f> diameters. Description. ]>. 302 

 Fio. Z.—Biddiilphla sciddlum Mann. Enlarged 375 diameters. Description, p. 309, 

 Fig. 4. — Biddulphia gladlorum Mann. Enlarged 750 diameters. Desciiption, p. 304. 



428 



