FAMILY 23. POLYMORPHINIDAE 201 



Having much compressed chambers arranged in planes more 

 than 180° from one another similar to Sigmoilina in the 

 Miliolidae. 



Sigmoidina Cushman and OzAWA. 



Subgenoholotype, Sigmoidella (Sigmoidina) pacifica Cushman and 



OZAWA. 



Sigmoidina Cushman and Ozawa, Contr. Cushman Lab. Foram. Res., 

 voL 4, 1928, p. 18. 



Having rather rounded chambers arranged in a sigmoid 

 series, added successively in planes 180° apart, five or six 

 chambers completing a cycle. 



Subfamily 2. Ramulininae 



Test free or attached, chambers widely separated by 

 stoloniferous connections. 



Genus RAMULINA Rupert Jones, 1875 



Plate 26, figure 8 



Genotype, by designation, Ramulina laevis Rupert Jones 



Ramulina Rupert Jones, in J. Wright, Rept. Proc. Belfast Nat. Field 

 Club, 1873-74, App. Ill, 1875, p. 88 (90). 



Test free, branching, consisting of more or less rounded 

 chambers connected by long stoloniferous tubes; wall thin, 

 hyaline. 



Jurassic to Recent. 



Genus VITRIWEBBINA Chapman, 1892 



Plate 26, figure 7 

 Genotype, by designation, Vitriwebbina sollasi Chapman 

 Vitriwebbina Chapman, Geol. Mag., dec. 3, vol. 9, 1892, p. 53. 



Test attached, consisting of a series of rounded chambers 

 with tubular connections; wall very finely perforate; early 

 chambers sometimes polymorphine. 



Cretaceous and Eocene. 



FAMILY 24. NONIONIDAE 



Test typically planispiral, more or less involute; wall cal- 

 careous, finely perforate ; aperture simple or cribrate, if simple, 

 at the base of the apertural face. 



