NO. lO AMERICAN SPECIES OF LEPIDOCYCLINA ^VAUGHAN 4I 



Alazan shale of Mexico ; at many places in the Oligocene of eastern 

 Cuba ; in the middle Oligocene Antigua formation ; and in Venezuela. 

 The specimen illustrated by plate 29, figure 4, deserves a note. It 

 was collected by me in the Alazan shale at the crossing of the Alazan- 

 Moyutta road over Rio Buena Vista, in association with L. supera. 

 The specimen was hardened with shellac, removed from the shale in 

 which it was embedded, and the side opposite the one photographed 

 was ground down to the embryonic chambers. The species is a 

 Eulepidina and differs from typical L. favosa only by the somewhat 

 smaller pitting of the central inflated part of the test : if the Alazan is 

 lower Oligocene, then both L. supera and L. chattahoocheensis range 

 as low as lower Oligocene. 



LEPIDOCYCLINA GIGAS Cushman 



Plate 22, figs. 1-4 



1919. Lepidocyclina g'lgas Cushman, Carnegie Inst. Washington Publ. 291, 

 p. 64, pl. I, figs. 3-5 ; pl- S, fig- 4- 



1919. Lepidocyclina undulata Cushman, idem, p. 65, pl. 3, figs. la, 2, 8, 9; 



pl. 15, fig. 5. 



1920. Lepidocyclina undulata Cushman, U.S. Geo!. Surv. Prof. Pap. 125, p. 60, 



pl. IS, figs. 2-5. 

 1920. Lepidocyclina gigas Cushman, idem, p. 63, pl. 19, figs. 1-3 {not fig. 4). 

 1924. Lepidocyclina gigas and Lepidocyclina undulata Vaughan, Bull. Geol. Soc. 



Amer., vol. 35, p. 799. 

 1926. Lepidocyclina gigas Vaughan, Quart. Journ. Geol. Soc. London, vol. 82, 



p. 396, pl. 25, figs. la and ib. 



Cushman has given good descriptions and figures of the external 

 features of L. gigas and its undulate variety, to which he applied the 

 name L. undulata. In my 1924 and 1926 papers I discussed both L. 

 gigas and L, undulata and their relation to L. undosa. In the collection 

 of the Scripps Institution there is of L. gigas a topotype which is 85 

 mm in diameter. Originally, this specimen must have been fully 100 

 mm in diameter. A specimen of the undulata variety, although broken 

 on the edges, is 80 mm in diameter. This species is probably not 

 exceeded in size by any other species. 



Plate 22, figure i is intended to illustrate the equatorial chambers, 

 X 20, near the periphery of a test, the upper edge of the figure being 

 toward the periphery. Figures 2, 3, and 4 of the same plate illustrate 

 a vertical section, X 20, of the equatorial chambers and the lateral 

 chambers on one side of the equatorial layer of less than one half of 

 a specimen from the type locality in Antigua, lower bed at Hodges 

 Bluff. Pillars are poorly developed, showing only occasionally in the 



