38 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



1924. Lepidocyclina (Nephrolepidina) crassata Vaughan, Bull. Geol. Soc. Amer., 



vol. 35, p. 798, pl. 34, figs. 3, 4- 

 1924. Lepidocyclina (Nephrolepidina) chattahoocheensis Vaughan, idem, p. 798, 



pl. 34, fig. 2. 

 1924. Lepidocyclina (Eulepidina) favosa Vaughan, idem, p. 799, pl. 34, fig. 8. 

 1924. Lepidocyclina (Eiilepidina) formosa Vaughan, idem, p. 799 (not Schlum- 



berger). 

 1926. Lepidocyclina (Enlepidina) formosa Vaughan, Quart. Journ. Geol. Soc. 



London, vol. 82, p. 395 (not Schlumberger). 



This is an amazingly variable species. Therefore, its discussion will 

 be introduced by quoting the original description of each of three 

 species which are here combined under one specific name. 



Cushman's original description of L. favosa is as follows: 



Test of medium size, compressed, strongly undulate or saddle-shaped, the 

 central portion umbonate, much curved, thick; the remainder of the test thin 

 and flangelike ; central umbonate mass vi'ith an ornamentation of polygonal areas 

 formed by raised ribs ; remainder of test fairly smooth but irregularly eroded in 

 most cases. 



Vertical section with numerous distinct pillars in the umbonate region, broad 

 at the exterior and narrowing to a point near the equatorial chambers, flattened 

 peripheral portion with few indistinct pillars. 



Diameter 15 to 18 mm for typical specimens. 



Type specimens (U.S.N.M. no. 328199) from Antigua, Leeward Islands, 

 U.S.G.S. no. 6881, from bluffs on north side of Willoughby Bay. 



Cushman's original description of L. crassata is as follows : 



Test of medium size, lenticular, comparatively thick in the center, thence taper- 

 ing toward the sides ; central portion convex, changing to a concave curve toward 

 the periphery; surface irregularly pustulate, especially where somewhat 

 weathered. 



Vertical section shows the general shape, convex at the center and broadly 

 rounded, thence thinning rapidly toward the periphery, where the surface is 

 concave, to the rather poorly developed peripheral border; height or thickness 

 of the test about one-third the diameter. Embryonic chamber large and very 

 thick-walled, often showing i or 2 accessory chambers, also thick-walled and 

 rather conspicuously perforate; young specimens show that for a time the em- 

 bryonic chamber is the greater part of the test. Equatorial band of chambers 

 rather large, even at the beginning, the outer wall convex and coarsely perforate. 

 Lateral chambers comparatively thick-walled, several times broad as high, some- 

 what lenticular in section, highest in the middle ; thence their height decreases 

 toward the sides. A comparatively small number of pillars in the central part 

 originating in the wall of the embryonic chamber and extending to the periphery. 



Horizontal section shows that the equatorial chambers are regularly hexagonal 

 and fairly thick-walled, and that those of successive annuli are of very different 

 sizes. 



Diameter up to 9 mm ; height up to 3 mm or more. 



Type specimen, section (U.S.N.M. no. 328192) from station 7513, orbitoidal 

 limestone, outcrop where Palmer Trail joins Ocujal Trail, Cuba. Specimens are 



