30 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



Other localities are Chila Cortaza Creek, west side, on road Santa 

 Maria Ixcatapec to Tantoyuca, about 50 feet above the creek bed 

 (M88V), and 4.5 km from Chila Cortaza on road to Tantoyuca 

 (M92V) ; collections by T. W. Vaughan and D. R. Semmes. The 

 geologic horizon is the upper Eocene Tantoyuca formation. 



Lepidocyclina semmesi is very nearly related to L. tantoyucensis, 

 the species next to be described. L. semmesi has more numerous 

 taller, and more open lateral chambers, and better developed pillars 

 than L. tantoyucensis. 



LEPIDOCYCLINA (NEPHROLEPIDINA) SEMMESI var. GRANOSA 

 Vaughan and Cole, n. var. 



Plate 30, fig. 2 



1930. Lepidocyclina ocalana var. suhdccorata Nuttall, Jonrn. Pal., vol. 4, p. 273 

 {not Cushman). 



This variety differs from typical L. semmesi by having a distinctly 

 papillate surface, the papillae being somewhat larger over the center 

 of the test. Plate 30, figure i, illustrates the surface, x 10, of typical 

 L. semwiesi, and figure 2 of the same plate illustrates the surface, also 

 X 10, of var. granosa. This variety bears to L. semmesi a relation 

 similar to that of L. ocalana var. snhdecorata to L. ocalana. 



Localities and geologic horizon. — Slope east side of Tantoyuca, 

 State of Vera Cruz, Mexico, 50 to 70 feet above the bed of the arroyo 

 (M96V), and 133 to 170 feet above the bed of the arroyo (M99V), 

 collected by T. W. Vaughan and D. R. Semmes. 



LEPIDOCYCLINA (NEPHROLEPIDINA) TANTOYUCENSIS 



Vaughan and Cole, n. sp. 



Plate 15, figs. I, 2 

 1930. Lepidocyclina ocalanu Nuttall, Journ. Pal., vol. 4, p. 273 (not Cushman), 



Test thin, thickest at the center, thence thinning regularly to the 

 periphery, slightly selliform, the average diameter of adult megalo- 

 spheric individuals about 13 mm, thickness about 1.5 mm. Megalo- 

 spheric individuals range in diameter from 5 to 14 mm ; microspheric 

 forms average 18 mm or more in diameter. Surface flaky, reticulate, 

 and scrobiculate from unequal weathering of the outer layers of 

 lateral chambers. Very small, scattered papillae are generally present. 



The embryonic chambers are of nephrolepidine type, the large 

 chamber somewhat embracing the smaller. The chamber wall is 

 strikingly thick. The diameter of the embryonic apparatus measured 

 across both chambers in an equatorial section is 1.15 mm; the 



