NO. 10 AMERICAN SPECIES OF LEPIDOCYCLINA VAUGHAN 9 



The specimens on which plate i, figures i and 2, are based are 

 designated cotypes. The embryonic chambers are subequal, each of 

 the two chambers being somewhat deformed in the specimen figured. 

 The two diameters of the apparatus are about equal, 0.60 mm. 



The equatorial chambers are in general diamond-shaped in hori- 

 zontal section, but the outer wall tends to be arcuate. The radial and 

 transverse diameters are nearly the same, about o.io mm. The height 

 of the chambers increases from the center toward the periphery, being 

 about 0.10 mm at the periphery of the embryonic chambers and about 

 0.20 mm at the edge of the test 2.5 mm from the embryonic chambers. 



The lateral chambers form rather regular tiers, about 10 or 11 

 layers over the center. Pillars are well developed, attaining a thickness 

 of as much as 0.15 mm on the surface, where they form distinct 

 papillae. 



Localities. — Cotypes, locality no. 3478, Nuevitas, Cuba, collected 

 by A. C. Spencer ; locality no. 7522, Mogote Peak, near Matanzas, 

 collected by O. E. Meinzer. 



Geologic association. — L. novitascnsis is associated with Disco- 

 cyclina sculpturata (Cushman), Lepidocyclina subraulinii Cushman, 

 L. perundosa Cushman, L. meinseri Vaughan, and Dictyoconus sp. 

 at locality no. 3478, and with Discocyclina pustulata and Lepidocyclina 

 meinseri at locality no. 7522, The horizon is Eocene, probably upper 

 Eocene. 



For some time I thought that this form might represent the megalo- 

 spheric generation of L. siibraidinii Cushman, which occurs in the 

 same rock with it ; however, I could not establish any such relation- 

 ship and, as will later be shown, it is probable that another form 

 represents the megalospheric generation of L. subraidinii. 



LEPIDOCYCLINA (LEPIDOCYCLINA) SUBRAULINII Cushman 



Plate 2, figs. 1-3 ; probably plate 3, fig. i 



1919. Lepidocyclina subraulinii Cushman. Carnegie Inst. Washington Publ. 291, 



p. 62, pi. II, figs. 6, 7. 



1920. Lepidocyclina subraulinii Cushman. U.S. Geol. Surv. Prof. Pap. 125, 



P- 73, pl- 30, fig- I. 



The figures cited represent the type and a vertical section of a para- 

 type from the same locality as the type. The identification of the other 

 specimens figured by Cushman is doubtful. Cushman's description is 

 as follows : 



Test circular, much thickened in the central portion, which occupies about 

 one-third the diameter of the test ; peripheral portion much flattened, thin ; thick 



