PLATE LXXI. 



CrISTELLARIA. — POLYMOEPHINA. 



Figures 1-3. — CristeUaria echinata, d'Orbigny, sp., 



b, Front peripheral aspect; fig. 1, x 30 ; figs. 2, 3, 



,, 4, 5. — CristeUaria aeuleata, d'Orbigny, . 

 6, Front peripheral aspect. 



,, 6, 7. — CristeUaria gemmata, Brady, 

 6, Front peripheral aspect. 



,, 8, 9. — CristeUaria costata, Fichtel and Moll, sp., 



b, Front peripheral aspect. 



10. — Dimorphous specimen, the earlier chambers arranged 

 as in CristeUaria, the later ones as in 

 Polymorphina, .... 



,, 11. — Polymorphina lactea, Walker and Jacob. , 



,, 12. — Polymorphina gibba, d'Orbigny, . 



b, Oral aspect. 



„ 13. — Polymorphina amygdaloides, Eeuss, 



b. Oral aspect. 



„ 1 4. — Polymorphina lactea, Walker and Jacob, — elongate 



variety, .... 



b, Oral aspect. 



„ 15, 16. — Polymorphina sororia, Reuss, 



,, 17-19. — Polymorphina sororia, var. cuspidata, nov., 

 b, Oral aspect. 



Diam. 



x 20 

 x 25 



x 35 



x 35 



X /O 



x 75 



x 50 

 x GO 



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