LARGER FORAMINIFERA OF THE GENUS LEPIDOCY- 

 CLINA RELATED TO LEPIDOCYCLINA MANTELLI 



By T. Wayland Vaughan 



0/ the Scripps Institution of Oceanography, La Jolla, California 



This paper contains a description of a new species of Lepidocyclina, 

 L. Jorresti, from the Oligocene of Antigua, a description of a variety 

 of L. manteUi, and notes on L. mantelli, L. swpera, and L. miraiiorensis, 

 with illustrations of each of the species enumerated. All of these 

 species belong to the subgenus Lepidocyclina in which the two ini- 

 tial embryonic chambers are characteristically of equal or subequal 

 size and are separated by a straight wall. All the species here con- 

 sidered have hexagonal, subhexagonal, or more or less spatulate 

 equatorial chambers. 



All the described and figured specimens are the property of the 

 United States National museum. 



LEPIDOCYCLINA (LEPIDOCYCLINA) FORRESTI. new Bpecies 



Plate 1, figs. 1-4, Plate 2, figs. 1-6 



1920. Lepidocyclina gigas Cushman (part), U. S. Geol. Survey Prof. Pap. 125 

 p. 63, pi. 19, fig. 4 (not figs. 1-3). 



Description of cotypes,jrom east of Lynch Point, Willoughhy Bay, 

 Antigua. — Test thin, waferlike, with or without a very small umbo. 

 Diameter of microspheric form 18 mm. : diameter of the macrospheric 

 form ranges from about 9 to about 13 mm. Thickness through the 

 center of the macrospheric form 0.75 mm. The surface of the cotypes 

 is smooth, obscurely reticulate, entirely without papillae, except that 

 a few smaU ones are present on the umbos of some specimens. 



Embryonic chambers nearly equal, separated by a straight wall; 

 outer wall moderately thick, about 0.025 mm.; greater diameter of 

 the embryonic apparatus 0.60 mm., lesser diameter, 0.45 to 0.5 mm. 



Equatorial chambers spatulate; either the radial or tangential dii- 

 ameter may be somewhat the longer. The radial diameter in the 

 macrospheric form ranges from 0.075 to 0.10 mm., usually about 



No. 2680.-PROCEEDINGS U. S. NATIONAL MUSEUM. VOL. 71 ., ART. 8 

 28945-27 1 



