172 FORAMINIFERA 



Test trochoid, subglobular or plano-convex, the ventral side 

 flattened, dorsal side strongly convex; periphery rounded; 

 chambers inflated, few; wall finely arenaceous with much 

 cement, the main wall perforate, occasionally appearing with 

 a thin outer layer ; aperture low, arched, at the umbilical margin 

 of the last-formed chamber. 



Palaeozoic. Pennsylvanian and Permian. 



Genus ROTALIAMMINA Cushman, 1924 

 Plate 22, figures 4, 5 



Genoholotype, Rotaliammina mayori Cushman 



Rotaliammina Cushman, Publ. 342, Carnegie Inst. Washington, 1924, 

 p. 11. 



Test trochoid, attached by the ventral side, all chambers 

 visible from above, only those of the last-formed coil from below; 

 dorsal wall of matted spicules, ventral wall of thin chitin ; aper- 

 ture ventral, along the edge of the chamber. 



Recent. Samoa, attached in shallow water. 



Subfamily 2. Globotextulariinae 



Test irregularly spiral, the chambers globose; aperture in the 

 open umbilical area. 



Genus GLOBOTEXTULARIA Eimer and Fickert, 1899 

 Plate 22, figure 6 



Genoholotype, Haplophragfnium anceps H. B. Brady 



Globotextularia Eimer and Fickert, Zeitschr. Wiss. Zool., vol. 65, 1899, 



p. 679. 

 Haplophraginium (part) H. B. Brady (not Reuss), Rep. Voy. C/iaWewfifer, 



Zoology, vol. 9, 1884, p. 313. 



Test irregularly spiral, chambers globose, the last-formed ones 

 increasing rapidly in size; wall arenaceous; aperture in the 

 open umbilical area. 



Recent. 



