FAMILY 45. ORBITOIDIDAE 351 



1919, p. 96, pi. 41, figs. 2-4) as a subgenus of LepidocycHna, with 

 Lepidocyclina duplicata Cushman as the holotype, was based on 

 microspheric individuals of a species, the megalospheric indi- 

 viduals of which have pliolepidine embryonic chambers. 



Subgenus LEPIDOCYCLINA Gumbel, 1868 



Holotype, Lepidocyclina mantelli (Morton) Gumbel 

 Isolepidina H. Douville, C. R. Acad. Sci., vol. 161, 1915, p. 724; Mem. 

 Soc. Geol. France, n. s., vol. 1, Mem. no. 2, 1924, pp. 11, 34 et seq. 



Embryonic chambers bilocular, equal or subequal in size, sep- 

 arated by a straight wall. Equatorial chambers of all the kinds 

 enumerated in stating the characters of the genus. Lateral 

 chambers and pillars of different kinds. 



Upper Eocene to upper Oligocene and perhaps lower Miocene. 



Subgenus NEPHROLEPIDINA H. Douville, 1911 



Genoholotype, LcjndocycUna marginata (Michelotti) 

 Nephrolepidina H. Douville, Philippine Jour. Sci., vol. 6, 1911, p. 59; 



Samml. Geol. Reichsmus., Leiden, ser. 2, vol. 8, 1912, pp. 269, 270; 



C. R. Acad. Sci., vol. 161, 1915, p. 727; Mem. Soc. Geol. France, n. s., 



vol. 1, Mem. no. 2, 1924, pp. 11, 46 et seq.; Ibid., vol. 2, Mem. no. 2, pp. 



73 et seq., 113 et seq. 

 Amphilepidina H. Douville, C. R. Acad. Sci., vol. 175, 1922, p. 553; 



Mem. Soc. Geol. France, n. s., vol. 1, Mem. no. 2, 1924, pp. 11, 44 et 



seq.: ibid., vol. 2, Mem. no. 2, 1925, p. 100 et seq. 



Embryonic chambers bilocular, reniform, a smaller partly 

 embraced by a larger chamber. Equatorial chambers spatulate, 

 with curved outer wall, or the distal end of the chamber is angu- 

 lar. Pillars and papillae present. 



Upper Eocene to lower Miocene. 



After establishing the subgeneric name Nephrolepidma, Pro- 

 fessor Douville proposed the subgeneric designation Amphilepi- 

 dina for those species of Lepidocyclina that have reniform em- 

 bryonic chambers and spatulate equatorial chambers, and in 

 1925 stated that L. sumatrensis may be considered the type. The 

 application of a similar procedure to Lepidocyclina s. s. would 

 divide it into two or more subgenera. Furthermore, according 

 to Professor Douville's own figures (see 1924, p. 46, figs. 40-41) 

 equatorial chambers with both curved and angular outer walls 



