350 FORAMINIFERA 



Subgenus POLYLEPIDINA Vaughan, 1924 



Genoholotype, Lepidocyclina (Polylepidinu) chiapasensis Vaughan 

 Pohjlcpidiva Vaughan, Bull. Geol. Soc. Anier., vol. 35, 1924, p. 807, pi. 

 30, figs. 1-3, text-figs. Aa-e. 



Embryonic chambers 4 to 5 in number, of which one or two 

 may be somewhat larger than the others. There may be two 

 subequal chambers somewhat larger than two other subequal 

 chambers, and four chambers so arranged as to form a cross, 

 The chambers tend to grade on one hand into Pliolepidiria and 

 on the other into Lepidocyclina. Polylepiclina in its embryonic 

 features appears to be very primitive. Equatorial chambers 

 with curved outer walls, sides converging to a truncate or to a 

 pointed inner end, radial diameter shorter than the transverse. 

 Each chamber in the type species^ communicates by openings 

 with two chambers of the next inner and two of the next outer 

 rings. The number of the apertures in a chamber wall ranges 

 from 1 to 3, they occur in the corners of the chambers, and are 

 from 23 to 38 \i in diameter. The equatorial chambers in their 

 form and the apertures resemble rather closely those of Or- 

 bitoidcs. Pillars and surface papillae present. 



Upper Eocene of southern Mexico. 



Subgenus PLIOLEPIDINA H. Douville, 1915 



Genoholotype, Lepidocyclina (Pliolcpidina)fohleri H. Douville 

 Pliolepidina H. Douville, C. R. Acad. Sci., vol. 161, 1915, p. 727; Mem. 



Soc. Geol. France, 2d ser., vol. 1, Mem. no. 2, 1924, pp. 11, 43, text-figs. 



34, 35. 

 Pliolepidina VAUGHAN, Bull. Geol. Soc. Amer., vol. 35, p. 796, pi. 33, figs. 



1, 2. 



Embryonic apparatus composed of a larger chamber with sev- 

 eral smaller chambers around its periphery. Equatorial cham- 

 bers with curved outer walls and converging sides and diamond- 

 shaped, both forms in the same specimen. 



Upper Eocene, Island of Trinidad, Panama, southern Mexico, 

 East Indies. 



Professor Douville suggests that the specimens he placed in 

 this subgenus might be teratologic, but it appears to me to be a 

 valid subgenus. I am inclined to consider both Polylepidina and 

 Pliolepidina as more primitive forms than Lepidocyclina s. s. 



Multicyclina proposed by Cushman (U. S. Nat. Mus. Bull. 103, 



