ART. 3 NEW SPECIES OF FORAMINIFERA VAUGHAN 9 



second chamber there are five smaller chambers, thereby encircling 

 the initial chamber. It appears that there is an initial spiral. The 

 relations are indicated on Plate 2, figure 1. 



A redescription of the equatorial chambers is unnecessary. To the 

 original description it may be added that radial dark lines in the 

 chamber wall are distinct and a similar annular line may be seen in 

 places. The perforations of chamber cavities of the roofs and floors 

 range between 2/z and 4/i across. The layers are about 12/^ tall at 

 the center and about 80m at the periphery. The roofs and floors 

 range from 18m to 25m thick. 



One of the sections that is not quite horizontal cuts the pillars 

 near the edge. They range from 30m to 40m thick, are subangular in 

 cross section, and are subcyclical in arrangement. The distance 

 apart slightly exceeds the thickness. 



A specimen, of which a vertical section was made, measures 1.7 

 mm. in diameter and 0.43 mm. thick. It is illustrated by Plate 2, 

 figure 2. There are about eight layers of lateral chambers over the 

 center; they decrease in number toward the edge, where there is one 

 layer over the equatorial chambers, which project only slightly or 

 not at all beyond the lateral chambers. The lateral chambers are 

 rather definitely outlined, but are variable in size. The height of 

 the cavities ranges between about 8m and 15m, with roofs, which are 

 perforate, of approximately the same thickness. Maximum length 

 about 80m, about half that length more frequent, and some chambers 

 as seen in the section are shorter. The pillars are produced by serial 

 thickenings, one above another, of the chamber walls. 



All the specimens described are from the Aguila El Cristo well 

 No. 1, depth 3,775-3,790 feet. The original type is in United States 

 National Museum. One horizontal section here described is also 

 deposited there. The vertical section belongs to the Scripps Institu- 

 tion of Oceanography. 



DISCOCYCLINA PERPUSILLA, new species 



Plate 2, figures 3, 4, 5, 5a 



1928. Discocyclina clarki Cole, Amer. Pal. Bull., vol. 14, p. 36, pi. 2, fig. 31 

 (not Orthophragmina clarki Cushman). 



Test small, very thin, waferlike. The diameter ranges from 0.6 

 to 2.3 mm., as is shown by the five specimens illustrated by Plate 2, 

 figure 3. The thickness through the center of a specimen about 

 2 mm. in diameter is about 180m; that is, the diameter is about ten 

 times the thickness. Very minute papillae on the surface. 



The embryonic apparatus is reniform. The initial subspherical 

 chamber is about 50m in diameter; the diameter of both chambers 

 measured through the center of the initial chamber is about 95m- 

 44031—29 2 



