FAMILY 29. HETEROHELICIDAE 235 



Test much compressed, the proloculum in the megalospheric 

 form rectangular, in the microspheric form the young apparently 

 planispiral, later chambers biserial, chambers long and recurved, 

 not overlapping ; wall calcareous, perforate ; aperture transverse 

 to the compression of the test with numerous papillae at the 

 base of the opening. 



Eocene to Recent. 



Subfamily 5. Spiroplectinatinae 



Test elongate, early portion clearly planispiral, later biserial 

 or uniserial; wall calcareous, perforate. 



Genus SPIROPLECTOIDES Cushman, 1927 

 Plate 33, figures 17, 18; plate 34, figure 9 



Genoholotype, Spiroplecta rosula Ehrenberg 



Spiroplectoides Cushman, Contr. Cushman Lab. Foram. Res., vol. 2, 



1927, p. 77. 

 Spiroplecta (part) of authors. 



Test with the early chambers planispiral, later ones biserial, 

 the test elongate, sides nearly parallel and the biserial chambers 

 very numerous; wall calcareous, finely perforate; aperture 

 elliptical, terminal or nearly so in the adult. 



Cretaceous to Recent. 



Genus SPIROPLECTINATA Cushman, 1927 

 Plate 34, figure 10 



Genoholotype, Textularia annectens Parker and Jones 



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



1927, p. 62. 

 Textularia (part) of authors. 

 Spiroplectina CusHMAN (not Schubert), Contr. Cushman Lab. Foram. 



Res., vol. 2, 1927, p. 78. 



Test with the early chambers planispiral, later ones biserial, 

 sides of the test straight and nearly parallel, the last group of 

 chambers uniserial with distinctly constricted necks and a 

 rounded terminal aperture. 



Cretaceous. 



There is some doubt as to this form. The specimens from 

 the Gault apparently are arenaceous and related to Gaudryina. 



