344 FORAMINIFERA 



Subgenus DISCOCYCLINA Gumbel, 1868 



Genolectotype, Orbitulites pratti Michelin 



Test discoid, flat or inflated, peripheral plan circular, surface 

 without radial ridges. 



Danian to uppermost Eocene. 



Subgenus AKTINOCYCLINA Giimbel, 1868 



Genolectotype, Orbitulites radians d'Archiac 

 Aktinocyclina Gumbei., Abhandl. k. bay. Akad. Wiss., vol. 10, 18G8, p. 



110, many figs. 

 Ortho'phragmina Munier-Chalmas (pars), (op. sup. cit.), 1891. 

 Actinocyclina H. DouviLLE, Bull. Soc. Geol. France, 4th ser., vol. 22, 1922, 



p. 79, pi. 5, figs. 3-8. 



Similar to Discocyclina except that there are on the surface 

 of the test elevated rays which, however, do not terminate in 

 protuberant angles on the margin of the test, as is the case in 

 Aster ocyclina. Gumbel says of the test "kreisrund". 



Middle and upper Eocene. 



The subgenus is reprcvsented in both Europe and America. 

 Recently specimens, not yet described in print, have been col- 

 lected in the upper Eocene Ocala limestone near Bainbridge, 

 Georgia. 



Subgenus ASTEROCYCLINA Gumbel, 1868 



Genolectotype, CaJcariva (?) s^e?/afa d'Archiac 

 Asteriacites Schlotheim, Die Petrefactenkunde, Nachtrag, 1822, p. 71, 



pi. 12, fig. 6 (not of Schlotheim of earlier date, teste Hodson). 

 Cisseis R. J. L. Guppy, Quart. Jour. Geol. Soc. London, vol. 22, 1866, p. 



584, pi. 26, figs. 19a, b (not Laporte and Gorg, 1839). 

 Asterodiscus Schafhautl, Sud-Bayern Leth. Geognos., 1863, p. 130 (not 



Ehrenberg, 1838). 

 Asterocyclhm GiJMBEL, Abhandl. k. bay. Akad. Wiss., vol. 10, 1868, p. 



689, many figs. 

 Orthophragviimi Munier-Chalmas (pars), (op. sup. cit.), 1891. 

 Asterodismis H. Douville, Bull. Soc. Geol. France, 4th ser., vol. 22, 1922, 



p. 60 (figs. 13, 14), 76. 

 Asteriacites Vaughan, Bull. Geol. Soc. Amer., vol. 35, 1924, pp. 790, 793. 

 Aster ocyclina Vaughan, Jour. Paleontol., vol. 1, 1928, p. 285. 



The only essential difference between Discocyclina and Aster- 

 ocycdina consists of difference in form. AsterocycUna is radi- 

 ate, the number of arms ranging from 5 to more than 12. The 



