PLATE XI. 



CoRNTJSPIRA. — PlaNLSPIRINA. — HaUERINA. 



Diam. Page 



Figures 1-3. — Cormtspira involvem, Reuss, . . x 30 200 



Figs. 1 a, 2, 3. Lateral aspect ; 1 b, peripheral aspect. 



,, 4. — Cormtspira carinata, Costa, sp., . . x 30 201 



a, Lateral aspect ; b, peripheral aspect. 



,, 5-9. — Cormtspira foliacea, Philippi, sp., . . . 199 



Figs. 5, 6a, Lateral aspect; 6 b, peripheral aspect, . x 15 



Figs. 7-9. Monstrous specimens, . x 16 



,, 10,11. — Pla nispirina contraria, d'Orbigny, sp., . . x 20 195 



Fig. 10. a, Lateral aspect; b, peripheral aspect. 

 Fig. 11. Horizontal section of the test. 



,, 12,13. — Hauerina comp>ressa, d'Orbigny, . . x 50 190 



Figs. 12 a, 1.3. Lateral aspect ; 12 J>, peripheral aspect. 



„ 14-16. — Hauerina circinata, Brady, . . . x 50 191 



Figs. 14, 15. Lateral aspect; 16, peripheral aspect. 



