24 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



there are 22 chambers in each tier on each side of the equatorial 

 layer. The chambers directly over the equatorial layer at the center 

 of the test have a length of 15 /x and a height of 10 /a; those in the 

 same tier at the periphery have a length of 90 ft and a height of 30 fi. 

 The number of chambers decreases regularly toward the periphery. 

 The equatorial layer is 35 /x in thickness at the center. It gradually 

 increases in thickness toward the periphery, where it is 135 ju, thick. 

 Pillars in the thickened central area have a diameter of no ju. at the 

 surface and gradually taper as they approach the equatorial layer. 



Type locality. — Hodge Hill, uppermost bed, Antigua, collected 

 by W. R. Forrest. The horizon is very high in the Antigua formation 

 and may be upper OHgocene. 



LEPIDOCYCLINA (LEPIDOCYCLINA) WETHERELLENSIS 

 Vaughan and Cole, n. sp. 



Plate 12, figs. 6, 7: plate 22. figs. 9, 10; plate 24, fig. 5 



Test small, stellate, central part inflated, surrounded by a relatively 

 wide, slightly undulating rim. Extending from the central area to 

 the margin of the test, there are about 8 irregularly spreading rays, 

 some of which are more prominent than others. The larger rays 

 generally extend beyond the margin of the test and produce a lobate 

 outline of the test. The surface is entirely covered by papillae which 

 are much larger on the umbo and the rays than in the depressed 

 areas between the rays, where they are rather small. The diameter 

 ranges from 3 to 7 mm ; thickness about i mm. The amount of the 

 central inflation varies considerably. 



The embryonic apparatus consists of two subequal chambers 

 separated by a straight wall. The length of the two chambers is 

 220 ix, the width 190 /x. The larger chamber has a length of 130 ij.\ 

 the chamber wall is thick, about 22 /x. 



The equatorial chambers have curved outer walls and converging 

 inner walls with pointed inner ends. They gradually increase in size 

 from the center to the periphery, where the radial diameter is about 

 60 fji ; transverse diameter about 75 ju. The height of the equatorial 

 chambers at the center of the test is about 30 /a; at the periphery 

 about 127 fx. 



The lateral chambers are numerous, rather uniform in height, and 

 arranged in regular tiers between well-developed pillars. In the 

 thickened central portion of the test on each side of the equatorial 

 layer there are about 10 chambers to a tier. The number decreases 

 regularly until at the junction of the central area with the flange there 



