FAMILY 42. PLANORBULINIDAE 327 



Asterodisciis Ehrenberg, Abhandl. k. Akad. Wiss. Berlin, 1838, p. 130 

 (genoholotype, Asterodiscus forskalii Ehrenberg). 



Spirobotrys Ehrenberg, Bericht. k. preuss. Akad. Wiss. Berlin, 1844, p. 

 247 (genoholotype, Spirobotrys aegaea Ehrenberg). 



Soldaniyia Costa, Atti Accad. Pont., vol. 7, fasc. 2, 1856, p. 246 (geno- 

 holotype, SoJdunina exagona Costa) . 



Test in the young-, coiled, attached by the dorsal surface, very 

 earliest chambers slightly trochoid, closely spiral, later in an 

 irregular series of a single layer about the periphery; wall cal- 

 careous, coarsely perforate ; apertures in the early stages one to 

 each chamber, near the periphery or in the irregular chambers 

 sometimes multiple. 



Tertiary and Recent. 



Genus PLANORBULINOIDES Cushman, 1928 



Plate 50, figure 12 

 Genoholotype, Plcmorbulina retinaculata Parker and Jones 

 Pkmorbulinoides Cushman, Contr. Cushman Lab. Foram. Res., vol. 4, 



1928, p. G. 

 Playiorhidmu (part) Parker and Jones, 1865. 



Test attached, in the early stages similar to Planorbulina but 

 the later chambers spreading, becoming elongate and more or 

 less separated to form a network; apertures in the early stages 

 as in Planorbulina, later several on the sides of the chambers, 

 with very short necks. 



Recent. 



Genus PLANORBULINELLA Cushman, 1927 

 Plate 50, figure 11; plate 51, figure 9 

 Genoholotype, Planorbnl'ma larvata Parker and Jones 

 Planorbulinella CusHMAN, Contr. Cushman Lab. Foram. Res., vol. 3, 



1927, p. 96. 

 Planorbulina (part) of authors. 



Test in the adult nearly bilaterally symmetrical, in the young 

 attached and like Planorhulina, soon having the chambers de- 

 veloped about the periphery in annular series, the chambers of 

 each series alternating with those of the adjacent ones; wall cal- 

 careous, coarsely perforate; apertures in the adult two, one at 

 each side of the chamber in the median line. 



Tertiary and Recent. 



