ART. 3 NEW SPECIES OF FORAMINIFEEA VAUGHAN" 13 



lateral chambers that occur in rather definite tiers. Its diameter is 

 about 5 mm. It is obviously necessary to compare it only with flat 

 umbonate species. Those described from America are B. marginata 

 (Cushman), which is much larger, 12 to 14 mm. in diameter; D. clarki 

 (Cushman), which has a smaller umbo and smaller, more scattered 

 surface papillae; and D.jlintensis (Cushman), which needs detailed 

 consideration. D. flintensis is very close to D. cushmani. It differs 

 principally by having a smaller and less prominent umbo; the test is 

 thinner, more nearly flat; and the surface granulations are not quite 

 so prominent. 



Another form that deserves mention in this connection is one that 

 is abundant in the Ocala limestone on the east side of Flint River, 

 about 13^^ miles north of Bainbridge, Ga. The specimens are sub- 

 lenticular or umbonate, between 3.5 and 5 mm. in diameter, and the 

 surface is coarsely granulate. The thickness through the center ranges 

 from 1 to 1.5 mm. The umbos of the umbonate individuals are less 

 sharply demarked and are somewhat larger and the sculpture is coarser 

 than in I), cushmani. The sculpture is similar to that of D.Jloridana 

 (Cushman),^ and the speciiiiens should perhaps be considered a variant 

 of that species. However, they appear to be persistently of smaller 

 diameter than D.floriduna, and they also dift'er by being sublenticular 

 or umbonate. The specimens, although similar in some features to 

 D. cushmani, are different and represent either a variant of D.Jloridana 

 or a new species. 



This species is named in honor of Dr. Joseph A. Cushman, who 

 has done much to increase knowledge of foraminifera. 



DISCOCYCLINA ZARAGOSENSIS, new species 



Plate 4, figures 1, 2, 3 



Test lenticular, 5 to 6 mm. in diameter, thickness through the 

 center 0.5 to 1 mm., slope from the center to the margins gradual, 

 producing a slightly domed but not an umbonate center. Surface of 

 test from the central part to near the periphery papillate; papillae 

 with rounded ends, WO/jl to 170 fx in diameter, rather crowded, and 

 tend toward arrangement in short, rather wavy rows. 



Embryonic apparatus composed of a smaller partly embraced by 

 a larger'chamber, as is usual in Discocyclina. 



Equatorial chambers rectangular, small. Length radially from 30ju 

 to 50At or less; tangential side about 23^i long; height about 23ai, 

 with very slight increase in height toward the periphery. In places 

 the equatorial layer very nearly pinches out. 



Lateral chambers well developed, but not sharply defined, about 

 10 or 11 on each side of the center of a specimen 1 mm. thick. 



« U. S. Geol. Survey Prof. Pap. 125, pi. 9, fig. 7, 1920. 



