198 FORAMINIFERA 



Genus DIMORPHINA d'Orbigny, 1826 



Plate 26, figure 6 

 Genoholotype, Dimorphina tuberosa d'Orbigny 

 Dimorphina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 264. 



Test cylindrical; chambers rounded, arranged at first in a 

 closed sigmoid series, becoming uniserial in the adult; sutures 

 distinct, depressed. 



Cretaceous to Recent. 



Genus POLYMORPHINA d'Orbigny, 1826 



Plate 26, figures 9, 10 

 Genotype, by designation, Polymorphina burdigalensis d'Orbigny 

 Polymorphina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 265. 



Test generally compressed, elliptical in side view, often much 

 elongated ; chambers cylindrical or much compressed, arranged 



EXPLANATION OF PLATE 26 



polymorphinidae 



Fig. 



1. Guthdina orientalis Cushman and Ozawa. From side and base. 



2. Guttulina (PyruUna) giitta d'Orbigny. (After d'Orbigny). From 



side and base. 



3. Pyrulinella lanceolata (Reuss). From side and front. 



4. Guttulina (Globulina) gibba d'Orbigny. (After d'Orbigny). From 



side and apertural end. 



5. Pseudopolymorphina doa7iei (Galloway and Wissler). From side and 



apertural end. 



6. Dhnorphina tuberosa d'Orbigny. (After d'Orbigny). From side. 



7. Vit7-iwebbina sollasi Chapman. (After Chapman). 



8. Ramulina globulifera H. B. Brady. (After H. B. Brady). 



9. Polymorphina charlottensis Cushman. Megalospheric form. From 



side and apertural end. 



10. Polymorphina burdigalensis d'Orbigny. (After d'Orbigny's Model). 



From tw^o sides and base. 



11. Sigmomorpha sadoensis Cushman and Ozawa. From two sides and 



base. 



12. Sigmomorpha (Sigmomorphina) frondicularis (Galloway and Wissler). 



13. Sigmoidella (Sigmoidina) pacifica Cushman and Ozawa. From two 



sides. 



14. Sigm,oideUa kagaensis Cushman and Ozawa. 



15. Sigmoidella elegantissima (Parker and Jones). 



