FAMILY 21. ORBITOLINIDAE 183 



Conulites Cushman (not Fischer), Publ. 291, Carnegie Inst. Washing-- 

 ton, 1919, p. 43. 



Test similar to Dictyoconus but the small tubular chambers 

 uniform over the test, connecting directly with the large interior 

 labyrinthic chambers. 



Eocene. 



Genus CHAPMANIA Prever and Silvestri, 1905 



Plate 23, figure 15 

 Genoholotype, Patellina aegyptiensis Chapman [?] 



Chapmania Prever and Silvestri, Boll. Soc. Geol. Ital., vol. 23, 1905, p. 



477. 



Test conical, finely arenaceous, calcareous, chambers annular, 

 divided into chamberlets but without the finely reticulate sub- 

 epidermic layer of Dictyoconus, partitions between the chamber- 

 lets double throughout except in the very earliest chambers; 

 median chambers in horizontal layers; apertures basal, circular 

 or crescentic. 



Eocene. 



Genus CYCLOLINA d'Orbigny, 1846 

 Plate 23, figure 17 



Genoholotype, CycloUna cretacea d'Orbigny 

 Cyclolina d'Orbigny, Foram. Foss. Bass. Tert. Vienne, 1846, p. 139. 



Test free, discoidal, very much compressed, circular in out- 

 line; chambers annular; apertures numerous, rounded, on the 

 periphery of the chamber. 



Cretaceous. 



Genus DICTYOCONOIDES Nuttall, 1925 



Plate 23, figures 18-23 

 Genoholotype, Conulites cooki Carter 



Dictyoconoides Nuttall, Ann. Mag. Nat. Hist., ser. 9, vol. IG, 1925, p. 



384. 

 Conulites Carter (not Fischer), Journ. Bombay Branch Roy. Asiatic 



Soc, vol. 6, 1861 (1862), p. 53. 



Test conical, chambers of the outer layer rectangular, ar- 

 ranged in spiral whorls, each with an opening at the base com- 



