44 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



There are about lo lateral chambers on each side of the equatorial 

 layer at the middle of the test. Although some of these are arranged 

 in regular tiers, many are irregular and overlapping. The most marked 

 irregularity occurs in the layers just over the equatorial layer. They 

 regularly decrease in number toward the periphery, stopping at the 

 marginal rim, which is composed of uncovered equatorial chambers. 

 The chambers at the surface over the middle of the test have a length 

 of about 130 /A and a height of about 40 ^. The roofs are thick and 

 arched, particularly in those chambers nearest the equatorial layer. 

 The equatorial layer is about 120 /x thick in the middle of the test, 

 increasing to about 190 /i, at the periphery. The equatorial chambers 

 have a radial diameter of 75 /* at the middle of the test. Those near 

 the periphery have a radial diameter of about 60 fi. 



Pillars are irregularly developed. They range in surface diameter 

 from 75 fi to as much as 120 fi. 



Localities and geologic hori:^on. — Top of Mogote Peak, ^ mile east 

 of east boundary of U.S. Naval Reservation and ^ mile south of 

 Monument H4, U.S.G.S. locality no. 7521 ; O. E. Meinzer, collector. 

 The geologic horizon is doubtful. The most abundant species is the 

 one described. There is also an indeterminable small species of Lepi- 

 docyclina and a specimen of a species of Carpenteria identified by 

 Cushman as C. americana, an Oligocene species. Until a larger fauna 

 is known or Lepidocyclina sp. c indet. is found in association with 

 other species, the geologic horizon will remain problematic. 



LEPIDOCYCLINA? sp. indet. d 

 Plate 25, fig. 3 



This is a small species, about 2 mm in diameter and 0.7 mm thick 

 through the center. The section on which this note is based is oblique 

 and unsatisfactory. 



Embryonic chambers unknown. 



Equatorial chambers project very slightly beyond the lateral. In the 

 central part of the test they seem to form an irregular double series ; 

 series single toward the periphery. Height at the periphery o.i mm. 



Lateral chambers form 3 layers over the center ; the successive layers 

 separated by thin walls ; tiers of lateral chambers very indistinctly or 

 not at all differentiated, there being long undivided spaces between the 

 inner and outer walls of a layer. 



This species may not belong to Lepidocyclina. 



Locality and geologic horizon. — North slope of La Piedra, north- 

 east of Jamaica, northeast of Guantanamo, Cuba, U.S.G.S. locality no. 

 7664, collected by N. H. Darton. Oligocene, probably upper. 



