2 PROCEEDINGS OF THE NATIONAL MUSEUM vol.71 



0.075 mm. x\s seen in a vertical section the chambers increase in 

 height toward the periphery. In the macrospheric form, height next 

 the embryonic chambers, about 0.05 mm., at the periphery 0.10 mm. 



The number of layers of lateral chambers over the center in the 

 macrospheric form on each side of the equatorial chambers, is 6 or 7, 

 and decreases toward the periphery, there being for a distance of 

 about 1.55 mm. from the margin no lateral over the equatorial 

 chambers. The length of the chambers exceeds the height, with 

 only obscure division into tiers. Pillars are absent or only weakly 

 developed. 



Description of paratypes from Long Island, Antigua (pi. 1, fig. 4, 

 pi. 2, figs. 3-5). — Lepidocyclina forresti appears to be abundant in 

 material from Long Island, Antigua. According to thin sections, 

 which seem to represent the microspheric form (pi. 1, fig. 4; pi. 2, 

 figs. 4-5), the thickness through the center is as much as 1.75 mm., 

 and there are as many as 16 layers of lateral chambers on each side 

 of the equatorial layer. Several specimens possess small papillae on 

 the umbo. The macrospheric specimens are similar to the cotypes. 



Localities and geologic horizon. — The cotypes are from material 

 collected by W. R. Forrest, of Saint John, Antigua, on a small point 

 about 5,300 feet east of Lynch Point, and about 1,000 feet west of 

 the base of Hudson Point at an altitude of 15 to 20 feet above sea 

 level. The rock is a cream-colored, finely granular limestone, packed 

 with specimens of the species of Lepidocyclina described above. Mr. 

 Forrest has sent me notes on the exposures between Soldier Point 

 and Lynch Point, but the precise position in the section is not clear 

 because of faulting and tilting or folding. The horizon is higher 

 than that of the exposures west of Lynch Point, and Mr. Forrest 

 thinks that it may be above the horizon of L. caneUei and L. vaughani 

 exposed in Half Moon Bay on the north side of Soldier Point, but 

 he is not certain of this relation. 



Other localities, Long Island, Antigua, collected by W. R. Forrest; 

 Rifle Butts, Antigua, U. S. G. S. No. 6854, collected by T. W. 

 Vaughan. The specimen from the last-cited locality was referred 

 by |Doctor Cushman to L. gigas. Oligocene, Antigua formation. 

 The species appears to have considerable stratigraphic range within 

 the Antigua formation. 



Affinities. — Lepidocyclina forresti belongs in the same group of spe- 

 cies as L. mantelli (Morton) , L. supera (Conrad) , and L. miraflorensis 

 Vaughan. L. mantelli is a larger species and has longer lateral cham- 

 bers; L. supera has well-developed pillars and papillae; and L. mira- 

 florensis is more dome-shaped in the central part. 



