288 FORAMINIFERA 



Genus CYMBALOPORELLA Cushman, 1927 



Plate 43, figures 2-4; plate 44, figure 7 



Genoholotype, Cymhalopora tabellaeformis H. B. Brady 

 Cymbaloporella Cushman, Contr. Cushman Lab. Foram. Res., vol. 3, 



1927, p. 81. 

 Cymbalopora (part) of authors. 



Test compressed, the early chambers trochoid, later ones in 

 annular series, those of each series somewhat alternating; wall 

 calcareous, coarsely perforate; apertures in the adult consisting 

 of a vertical series of small circular openings on the sides of 

 the peripheral face of each chamber. 



Late Tertiary and Recent. 



Genus HALKYARDIA Heron-Allen and Earland, 1919 



Plate 43, figures 5, 6; plate 44, figure 8 

 Genotype, by designation, Cymbalopora radiata, var. yninima Liebus 

 Halkyardia Heron-Allen and Earland, Mem. Proc. Manchester Lit. 



Phil. Soc, vol. 62, 1917-18 (1919), p. 107. 

 Cymbalopora Liebus, 1911 (not Hagenow). 



Test biconvex, early chambers trochoid, later ones in annular 

 series extending ventrally to the umbilical area, the dorsal side 

 of earlier chambers somewhat hidden by a later covering of shell 

 material, umbilical area filled by shell material with fine tubules, 

 the exterior standing out as a rounded boss. 



Eocene. 



Genus TRETOMPHALUS Moebius, 1880 

 Plate 43, figures 7-10; plate 44, figure 9 



Genoholotype, Ronalina biilloidcs d'Orbigny 

 Tretomphalus Moebius, Foram. Insel Mauritius, 1880, p. 98. 

 Rosalina (part) d'Orbigny, 1839. 

 Cymbalopora (part) of authors (not Hagenow). 



Test free, early stages Discorbis-like in a flattened trochoid 

 arrangement, later in some forms like Cymbalojwra with alter- 

 nating series of annular chambers; wall calcareous, perforate; 

 in the adult developing a large semiglobular "float chamber", 

 an interior, entirely globular or lobed chamber with a valve-like 

 opening inside the outer wall which is provided with numerous 



