PLATE XCI. 



DlSCORBINA. 



Diam. Page 



Figure 1. — Discorbina polystomelloides, Parker and Jones, . x 30 652 



a. Superior aspect; b, inferior aspect; c, peripheral 

 aspect. 



,, 2, 3. — Discorbina biconcava, Parker and Jones, . x 60 653 



Figs. 2 a, 3 b, Superior aspect; figs. 2 6, 3 a, inferior 

 aspect ; 2 c, 3 c, peripheral aspect. 



,, 4. — Discorbina rugosa, d'Orbigny, sp., . . . x 90 652 



ft, Superior aspect ; b, inferior aspect ; c, peripheral 

 aspect. 



,, 5, 8. — Discorbina allomorphinoides, Reuss, sp., . . . 654 



Fig. 5. «, Superior aspect; b, inferior aspect; e, peri- x 100 



pheral aspect, . 



Fig. 8.'«, Superior aspect; /', inferior aspect; r, peri- 

 pheral aspect, . . . x 50 



,. 6. — Discorbina saulcii, d'Orbigny, sp., . x 50 653 



a, Superior aspect; b, inferior aspect; c, peripheral 

 aspect. 



„ 7. — Discorbina ventricosa. n. sp., . . x 50 654 



ft, Superior aspect; b, inferior aspect; c, peripheral 

 aspect. 



„ 9. — Discorbina obtusa (?), d'Orbigny, sp., . x 50 644 



a, Superior aspect; b, inferior aspect; c, peripheral 

 aspect. 



