NO. II FORAMINIFERA OF VENEZUELA GRAVELL 29 



Test small, lenticular; diameter 1.60 to 2.5 mm; thickness through 

 center 0.6 to 0.7 mm, decreasing gradually to the periphery. Two 

 subequal embryonic chambers ; initial chamber globular, about 100 /* 

 in diameter and about 100 /x high, followed by a subglobular chamber, 

 length about 100 /x ; width about 50 fi ; walls of embryonic chambers 

 about 15 /* thick. 



Equatorial chambers open arcuate in form, increasing in size toward 

 the periphery; tangential diameter 70 to 100 /x ; radial diameter 40 to 

 60 fji ; roofs and floors perforated by cribriform pores having a diam- 

 eter of about 2 fji. Equatorial layer about 50 ju, high near embryonic 

 apparatus, increasing to about 160 /x high at a point approximately 

 0.6 mm from the center; roofs and floors about 15 ^u, thick. 



Lateral chambers rather uniform in size ; length about 80 to 100 /x ; 

 height about 20 to 30 /u ; roofs and floors about 15 fi thick, perforated 

 by minute pores. There are about six to seven tiers of lateral 

 chambers on each side of the equatorial layer over the center of the 

 test, the number decreasing toward the periphery, where the equa- 

 torial layer is covered by only one layer of chambers. 



Pillars small, formed by the overlapping of ends of the lateral 

 chambers. These pillars obtain a maximum diameter of about 30 /x 

 at their distal ends over the center of the test. 



Locality and geologic horizon. — From locality 443, lower part of 

 producing zone, British Controlled Oil Fields Ltd., Buchivacoa, 

 Falcon. This locality is believed to be in the Agua Clara or even the 

 San Luis series. 



LEPIDOCYCLINA sp. indet. (6) 



Test small, with a large, thick central area, surrounded in some 

 specimens by a narrow collar. Diameter up to 3 mm ; thickness up 

 to about 1.24 mm. 



As specimens were rare and in a rock matrix, it was impossible 

 to obtain sections that showed the character of the embryonic ap- 

 paratus ; therefore no specific determination has been attempted. 



Although no good horizontal sections were obtained, the equatorial 

 chambers appear to be spatulate to hexagonal. Several good vertical 

 sections were obtained, showing the equatorial chambers to be square 

 to rectangular, in vertical section ; at center about 30 ^u, high ; radial 

 diameter about 60 fx ; roofs and floors about 20 //. thick. 



Lateral chambers in vertical section resemble flat convex lenses 

 and are in regular tiers, as many as 11 chambers over the center in a 

 tier 450 fi high, or about one chamber to every 40 /x. They decrease in 

 number toward the periphery, ending at the collar, which is not 



