FAMILY 23. POLYMORPHINIDAE 197 



clockwise close sigmoid series viewed from the base, successive 

 chambers added in planes less than 180°, three or four chambers 

 in a cycle; sutures distinct; aperture radiate. 



Jurassic to Recent. 



The following three subgenera may be distinguished by the • 

 sutures and form. 



Giittulina s. str. having much depressed sutures. 



Pyrulina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 267, (sub- 

 genotype, monotypic, Polymorphina (Pyrulina) gutta d'Or- 

 bigny) characterized by an elongated test and non-depressed 

 sutures. 



Globulina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 266 (sub- 

 genotype, by designation, Polymorphina (Globulina) gibba 

 d'Orbigny) characterized by a generally globular test and non- 

 depressed sutures. 



Genus PSEUDOPOLYMORPHINA Cushman and 

 Ozawa, 1928 



Plate 26, figure 5 



Genoholotype, Pseudo polymorphina hmizmvai Cushman and Ozawa 



Pseudopohpnorphina Cushman and Ozawa, Contr. Cushman Lab. Foram. 



Res., voL 4, 1928, p. 15. 

 Polymorphina (part) of authors. 



Test elongate, often somewhat compressed ; chambers rounded, 

 generally as long as broad, arranged in a closed sigmoid series 

 in the earlier stages, becoming biserial in the adult; sutures 

 distinct, depressed; aperture radiate. 



Jurassic to Recent. 



Genus PYRULINELLA Cushman and Ozawa, 1928 



Plate 26, figure 3 



Genoholotype, Polymorphina lanceolata Reuss 



Pyrulinella CusHMAN and OzAWA, Contr. Cushman Lab. Foram. Res., 



vol. 4, 1928, p. 16. 

 Polymorphina (part) of authors. 



Test fusiform or cylindrical ; chambers rounded in the earlier 

 Guttulina stage but often elongate in the later biserial stage; 

 the arrangement of the chambers sometimes tending to become 

 uniserial; sutures distinct, not depressed. 



Jurassic to Recent. 



