30 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



covered by lateral chambers. The chambers increase slightly in size 

 toward the surface of the test. Near the equatorial layer, height 

 about 18 p.; length about 130 /a; roofs and floors about 18 fi thick. 

 A few large cone-shaped pillars over center of test originate at point 

 a little above the equatorial layer and rapidly increase in thickness, 

 attaining a diameter of as much as 240 /* at the surface. A section 

 parallel to the equatorial layer shows 11 large polygonal pillars in 

 center of test, one occupying a central position ; they are surrounded 

 by a polygonal mesh formed by the walls of the lateral chambers. 



Locality and geologic horizon. — Locality 1043, San Luis series, 

 middle Oligocene. Associated with Lepidocyclina canellei Lemoine 

 and R. Douville and Aniphistegina lessonii d'Orbigny. 



LEPIDOCYCLINA GIGAS Cushman 



Lepidocyclina gigas Cushman (15, p. 63, pi. 19, figs, i, 2, 3, not fig. 4). 

 Lepidocyclina gigas Vaughan (47, p. 799. 51, p. 295). 



This species is associated with L. {Nephrolepidina) iiudosa Cush- 

 man at localities 477, 478, and in transported blocks at locality 1223 

 from the San Luis series, which is considered to be middle Oligocene. 



Lepidocyclina {Lepidocyclina) gigas, according to Vaughan (42, 

 p. 799), appears to be the microspheric form of L. {Nephrolepidina) 

 jindosa Cushman, as it invariably occurs with L. {Lepidocyclina) 

 imdosa and also has the same type of equatorial chambers. 



Lepidocyclina gigas is a very common and widely distributed middle 

 Oligocene species. Besides occurring in Venezuela, it has been found 

 at numerous localities in Antigua, Mexico, Jamaica, and Trinidad. 



Subgenus NEPHROLEPIDINA H. Douvill6 



LEPIDOCYCLINA (NEPHROLEPIDINA) UNDOSA Cushman 



Plate 6, fig. 4 



Lepidocyclina undosa Cushman (15, p. 68, pi. 25, fig. 3). 

 Lepidocyclina (Nephrolepidina) undosa Vaughan (57, p. 294, pi. 48, fig. 3). 

 Lepidocyclina (Eulepidina) undosa Gorter and Van der Vlerk (25, p. no, pi. 15, 

 figs. 1-4). 



This species is very abundant in parts of the San Luis limestone of 

 V'enezuela. It occurs in material from localities 4, 477, 478, 959, 960, 

 968, Cerro Gauche, and in transported blocks at localities 12 19, 1221, 

 and 1223, and possibly as fragments in a limestone at locality 236, 

 which is composed of unweathered fragments of Heterostegina sp., 

 L. {Lepidocyclina) sp., and Aniphistegina lessonii d'Orbigny, ce- 

 mented with calcite. The foraminifera appear to be primary, as they 

 are unweathered. 



