NO. II FORAMINIFERA OF VENEZUELA GRAVELL 21 



Family RUPERTIIDAE 



Genus CARPENTERIA Gray 



CARPENTERIA sp. 



Plate 2, figs. 6, 7 



Thin sections of both Eocene and OHgocene Hmestone contain a 

 few sections of Carpenteria. Owing to the impracticabiUty of re- 

 moving them from the indurated matrix, it was not possible to study 

 their surface or to obtain complete information regarding their form. 



In view of the reasons stated above it would be very hazardous to 

 attempt specific determination of these specimens. It is possible that 

 they represent two or more species. 



A horizontal section from locality 12 is shown on plate 2, figure 7. 

 A vertical section of a specimen from locality 1206 is figured on 

 plate 2, figure 6. 



Localities and geologic horizon. — Localities 12, 148, 163, 469, 957, 

 960, 970, 1043, 1206, and 1223. Localities 12, 148, and 163 are from 

 the upper Eocene. The remaining localities are from the middle 

 OHgocene. 



Family ORBITOIDIDAE 



Genus DISCOCYCLINA Giimbel 



DISCOCYCLINA sp. indet. 



Plate 2, figs. 8, 9 



Test flat to slightly undulate, very thin, only slightly increasing 

 in thickness toward the center ; no distinct umbo. All the specimens 

 examined were broken, the thinness of the test making preservation 

 of unbroken specimens difficult. Diameter at least 5.5 mm, possibly 

 as much as 8 mm ; thickness through center about 0.4 mm, decreasing 

 very gradually to the periphery, which is about 30 /x thick ; surface 

 of test apparently covered by very small concentrically arranged 

 papillae, about 30 ju, in diameter. 



The embryonic apparatus is composed of two chambers, the initial 

 chamber being spherical, about 90 /* in diameter, and the second 

 being crescent-shaped, half surrounding the initial chamber. The 

 dimensions of the second chamber are about 80 by no jx. 



Equatorial chambers rectangular, elongated radially, and in definite 

 annuli ; near center chambers have a radial length of 40 /a ; width 

 about 25 IX ; toward periphery radial length from 40 to 100 ix, average 

 length being about 80 fx : average width about 30 p.. 



