PLATE LXXIL 



POLYMORPHINA. 



Diam. Page 



Figures 1-3. — Polymorphina angusta, Egger, . . . x 45-60 563 



b, Oral aspect. 



,, 4. — Polymorphina sororia, var. cuspidata, nov., . x 50 563 



b, Oral aspect. 



„ 5, 6. — Polymorphina lanceolata, Eeuss, . . x 45 564 



b, b, Oral aspect. 



,, 7, 8. — Polymorphina ovata, d'Orbigny, . . . x 25 564 



b, Oral aspect. 



,, 9-11. — Polymorphina compressa. d'Orbigny, . . . 565 



b, Oral aspect. 



Fig. 9. x 18 diam.; fig. 10, x 25 diam.; fig. 11, . x 40 



,, 12-15. — Polymorphina elegant issima, Parker and Jones, . x 50 566 



b, b, b, Oral aspect. 



,, 16,17. — Polymorphina seguenzana, n. sp., . x 40 567 



b, Oral aspect. 



,, 18. — Polymorphina thouini, d'Orbigny, 



,, 19. — Polymorphina communis, d'Orbigny, 



„ 20. — Polymorphina problema, d'Orbigny, 



b, Oral aspect. 



