FAMILY 25. CAMERINIDAE 209 



A. Test involute throughout. 



1. Test without secondary siteleton or canal system. 



Nummulostegina. 



2. Test with secondary skeleton and canal system Camerina. 



B. Test evolute, not campanulate and spreading Assilina. 



C. Test campanulate. 



1. Early test lenticular, later campanulate OpercuUnella. 



2. Test campanulate throughout, much compressed. . . Operculina. 

 III. Test with chamberlets. 



A. Adult without annular chambers. 



1. Early chambers simple, later ones divided into chamberlets. 



Heterostegina. 



2. Early chambers divided into chamberlets as well as the adult. 



Spiroclypeus. 



B. Adult with annular chambers. 



1. Coiled early chambers in both microspheric and megalospheric 



forms, annular chambers in adult Heteroclypeus. 



2. Megalospheric form with annular chambers directly after the 



proloculum Cycloclypeus. 



Subfamily 1. Archaediscinae 

 Test not broken up into chambers 



Genus ARCHAEDISCUS H. B. Brady, 1873 



Plate 29, figures 1, 2; plate 30, figure 1 



Genoholotype, Archaediscus karreri H. B. Brady 



Archaediscus H, B. Brady, Ann. Mag. Nat. Hist., ser. 4, vol. 12, 1873, 

 p. 286. 



Test lenticular, consisting of a proloculum and long undivided 

 second chamber, close coiled; wall thick, calcareous, finely 

 perforate, upper and lower surfaces thickened; aperture at the 

 open end of the chamber. 



Carboniferous. 



Subfamily 2. Camerininae 

 Test with numerous chambers 



Genus NUMMULOSTEGINA Schubert, 1907 



Plate 29, figure 3; plate 30, figure 2 



Genoholotype, Nummulostegina velibitana Schubert 



Nummulostegina Schubert, Verhandl. k. k. Geol. Reichs., 1907, p. 212. 



Test lenticular, planispiral, bilaterally symmetrical, divided 



