PLATE XC. 



DlSCORBTNA. 



Figure 1. — Discorbina bertheloti, var. baconica, Hantken, 



Diam. Pa tie 



var., . . . . x 75 (351 



«, Superior aspect; h, inferior aspect; c, peripheral 

 aspect. 



,, 2, 3. — Discorbina rarescens, . . . x 75 651 



Fig. 2 a. Superior aspect; figs. 2 b, 3, inferior aspect; 

 fig. 2 c, peripheral aspect. 



., 4. — Discorbina, — carinate form possibly related to 



the last-named species, . . . x 100 651 



,,5,6,9-12. — Discorbina patisiensis, d'Orbigny, sp., . . 648 



Figs. 5a, 6a, 9, Superior aspect; figs, bh, &h, inferior 



aspect; figs. 5 c, 6 c, peripheral aspect. 

 Figs. 10-12, Double specimens. 

 Figs. 5, 6, x 40 diam.; figs. 9, 12, x 90 diam.; 



tigs. 10, 11, . . .x 100 



,, 7, 8. — Discorbina cuncinna, n. sp., . x 100 646 



Figs. 7a, 8. Superior aspect ; b, inferior aspect ; c, peri- 

 pheral aspect. 



