52 GEOLOGY AND PALEONTOLOGY OF THE WEST INDIES. 



Orthophragmina cubensis, new species. 

 (Plate 9, Figure 3; Plate 10, Figures 2 to 4.) 



The following is a description of this species: 



Test small, lenticular, circular, comparatively thick, thickness in the center 

 greatest, about three-fifths the diameter, circular, gradually thinning toward 

 the periphery, but without a definite border, periphery rounded; surface with 

 numerous rather large papillae in the center, gradually growing smaller toward 

 the periphery. 



Vertical sections showing the general shape of the test, which, due to the 

 straightness of the slope from center to periphery, makes almost a diamond- 

 shaped vertical section; pillars of the center very heavy, thick, increasing 

 rapidly in diameter toward the surface, the peripheral ends projecting above 

 the adjacent lateral chambers; equatorial chambers of the same height, the 

 band hardly increasing in diameter from center to periphery, very small; 

 lateral chambers in vertical columns, up to 20 or more in a column in the 

 thickest central portion, the individual chambers at least 4 or 5 times as wide 

 as high in section. 



Horizontal sections show the rectangular chambers of the equatorial region 

 several times as long as wide, the lateral chambers forming an irregular net- 

 work about the sections of the pillars, often several columns of vertical cham- 

 bers between the pillars. 



Diameter 1.5 to 3.5 mm. 



Type specimens (U.S.N.M. No. 328184) from station 3475, Boston 

 mine, near Santiago, Cuba, collected by A. C. Spencer. 



This seems to be a common Cuban species, occurring in material 

 from several stations, as follows: 6117, boulder from the band of lime- 

 stone, hill east of railroad and south of Cristo, near Santiago, Cuba, 

 collected by C. W. Hayes, April 1901; 6118, limestone near railroad 

 on trail to mines south of Cristo, collected by C. W. Hayes; 6119, 

 Isabella and Boston manganese mine near Santiago, Cuba, collected 

 by C. W. Hayes; 6120, loose material, Santiago Province, Cuba, exact 

 locality unknown; 6122, greensand limestone, Boston manganese mine, 

 3 miles east of Cristo, Santiago Province, Cuba, collected by A. C. 

 Spencer; 6123, resting on ore-bed 4 to 6 feet thick, Ponupo manganese 

 mine, Santiago Province, Cuba, collected by A. C. Spencer; 6124, 

 foraminiferal limestone, Ponupo manganese mine, Ponupo, Santiago 

 Province, Cuba, collected by R. T. Hill; 6125, railroad cut near San 

 Nicolas manganese mine, west of San Luis, Santiago Province, Cuba, 

 collected by C. W. Hayes; 3448, limestone from hillside south of Ponupo 

 manganese mine, La Maya, near Santiago, Cuba, collected by T. W. 

 Vaughan; 7666, from Sierra Guaso, northeast of Guantdnamo, Cuba, 

 collected by N. H. Darton, 1916. 



The embryonic chambers of this species, so far as seen, are unequal in 

 size and comparable to those seen in the subgenus Nephrolepidina 

 of Lepidocyclina, the larger one kidney-shaped and partially embracing 

 the smaller. 



In its general characters this species suggests 0. douvillei Schlum- 

 berger, but differs in several essential details. 



