FAMILY 36. CYMBALOPORETTIDAE 285 



Genus ARNAUDIELLA H. Douville, 1907 



Plate 55, figures 10, 11 

 Genoholotype, Arncmdiella grossouvrei H. Douville 

 Arnaudiella H. Douville, Bull. Soc. Geol. France, ser. 4, vol. 6, 1907, 

 p. 599. 



Test lenticular, the early chambers involute, later ones 

 compressed and somewhat evolute, supplementary thin-walled 

 chambers developed along the spiral ; wall calcareous, perforate, 

 with pillars. 



Eocene. 



Hofker, 1927, has suggested the placing of Arnaudiella in 

 the Calcarinidae. A study of the types in Paris through the 

 kindness of Dr. Douville has made me feel that this may be one 

 solution of the vacuole-like openings in the test although other- 

 wise the genus seems related to the Camerinidae. 



This family which developed from the spinose forms of 

 Rotalia shows a progressive complexity of structure from the 

 simpler Calcarina to the complex Baculogypsina. The large 

 spines are developed early and are one of the striking characters 

 of the family. The species of the various genera are char- 

 acteristic of warm shallow waters, at the present time in the 

 Indo-Pacific. 



FAMILY 36. CYMBALOPORETTIDAE 



Test in the early stages trochoid, close to Discorlns, in the 

 later development the chambers generally in annular series about 

 the periphery ; wall calcareous, perforate ; apertures numerous, 

 circular pores in the adult, variously arranged ; in Tretompkahis 

 pelagic in the adult. 



Genus CYMBALOPORETTA Cushman, 1928 



Plate 43, figure 1 ; plate 44, figure 6 

 Genoholotype, Rosalma sqiininmosa d'Orbigny 

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



1928, p. 7. 

 Rotalia (part) d'Orbigny. 

 Roffalina (part) of authors (not d'Orbigny) . 

 Cymbalopora of authors (not Hagenow^). 



