230 FORAMINIFERA 



Subfamily 2, Pavonininae 



Test with the planispiral stage much reduced, the biserial stage 

 of short duration and the adult with single chambers extending 

 clear across the face of the test or even becoming completely 

 annular. 



Genus PAVONINA d'Orbigny, 1826 



Plate 33, figure 2; plate 34, figure 2 

 Genoholotype, Pavonina flahelliformis d'Orbigny 

 Pavonina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 260. 



Test much compressed, the very early stages in the micro- 

 spheric form showing traces of coiling, followed by chambers 

 arranged biserially, and in the adult by uniserial chambers 

 becoming laterally extended, even forming annuli; wall cal- 

 careous, coarsely perforate; apertures in the adult, many 

 rounded openings in the periphery. 



Upper Cretaceous (?), Eocene to Recent. 



See Cushman, Foraminifera of the Genera Siphogenerina 

 and Pavonina (Proc. U. S. Nat. Mus., vol. 67, Art. 25, 1926, 

 pp. 1-24, pis. 1-6). 



Subfamily 3. Giimbelininae 



Test in the early stages of the microspheric form planispiral, 

 often skipped in the megalospheric form, followed by a biserial 

 stage which may be continued or may be followed by globular 

 chambers variously arranged. 



Genus GuMBELINA Egger, 1899 

 Plate 33, figures 3, 4; plate 34, figure 3 

 Genotype, by designation, Textularia glolmlosa Ehrenberg 

 Gumbelina Egger, Abhandl. kon. bay. Akad. Wiss. Miinchen, CI. II, vol. 



21, 1899, p. 31. 

 Textularia (part) of authors (not Defrance). 



Test with the early chambers planispiral, at least in the micro- 

 spheric form, later chambers biserial ; wall calcareous, perforate ; 

 aperture large and open, arched, at the base of the inner 

 margin of the last-formed chamber, without teeth. 



Cretaceous. 



