114 FORAMINIFERA 



Subfamily 1. Spiroplectammininae 



Test with the early chambers distinctly planispiral in both 

 microspheric and megalospheric forms; later chambers biserial; 

 wall arenaceous. 



Genus SPIROPLECTAMMINA Cushman, 1927 

 Plate 11, figures 1, 2; plate 13, figure 1 



Genoholotyijc, Tcxtularia agghitinans, var. biforniis Parker and Jones 



Sph'oplectarnmina Cushman, Contr. Cushman Lab. Foram. Res., vol. 3, 



1927, p. 23. 

 Textularia (part) PARKiai and Jones (not Defrance), Philos. Trans., 



vol. 155, 1865, p. 370. 

 Spiroplecta H. B. Brady (not Ehrenberg), Rep. Voy. Challenger, 



Zoology, vol. 9, 1884, p. 376. 



Test free, early chambers planispiral in both microspheric 

 and megalospheric forms, later ones biserial; wall arenaceous 

 with a yellowish-brown cement ; aperture in the planispiral por- 

 tion at the base of the apertural face, in the biserial portion at 

 the inner margin of the chamber. 



Carboniferous to Recent. 



This genus represents a simple radicle from which the whole 

 family of the Textulariidae has developed, the biserial portion 

 best thought of as a spiral coiling about an elongate axis, each 

 chamber representing a turn of 180° from the preceding, and 

 two chambers completing a whorl. 



Subfamily 2. Textulariinae 



Test typically biserial or becoming uniserial, usually free; 

 chambers simple or labyrinthic; wall arenaceous, usually per- 

 forate; aperture simple or cribrate. 



Genus TEXTULARIA Defrance, 1824 

 Plate 11, figures 3, 4; plate 13, figure 2 



Genoholotype, Textularia sagithda Defrance 



Textularia Defrance, Diet. Sci. Nat.,' vol. 32, 1824, p. 177. 

 Textilaria Ehrenberg, Abhandl. Kais. Akad. Wiss.. Berlin, 1839, p. 135. 

 Plecanium Reuss, Sitz. Akad. Wiss. Wien, vol. 44, 1861 (1862), p. 383 

 (genotype, by designation, Textilaria labiata Reuss). 



