ART. 3 NEW SPECIES OF FORAMINLPERA— VAUGHAN" 11 



walls or the radial chamber walls. The walls entirely dissolved and 

 left open spaces devoid of canals. 



Two partially decalcified preparations were made of D. pratti from 

 Cotes Basques, Biarritz, Pentacrinus marl, collected by M. N. 

 Bramlette, and several thin sections that were not decalcified were 

 made. The passages for stolons were obvious, but no trace of canals 

 could be found. There is usually a dark median line in each radial 

 chamber wall, and often minute dark granules are present along it, 

 but apparently it does not represent a canal. A similar line can 

 also be seen in places within the annular wall, but no annular canal, 

 such as the marginal canals of Heterostegina, were recognized. 



This discussion may be summarized and terminated by the state- 

 ment that no definite trace of a canal system was found in Discocyclina. 



DISCOCYCLINA CUSHMANI, new species 



Plate 3, figures 1-4 



Test circular in plan, thin except in the center, where there is a 

 distinct, sharply demarked circumvallate, dome-shaped umbo. Diam- 

 eter of the test, 5 mm.; diameter of the umbo, 1.3 mm., about one- 

 quarter the diameter of the test. Thickness of test through the 

 umbo as much as 1.8 mm.; outside the umbonate area, thickness, 

 0.56 mm.; that is, the thickness through the umbo is about three 

 times that of the surrounding part of the test. Outer surface densely 

 and coarsely granulate. Over the umbo and in the area adjacent to 

 it the granulations range from 30^1 to QO/x across; they are subcircular 

 or elliptical in plan and do not exhibit definite arrangement. Exterior 

 to the area above described the granulations have a rather definite 

 cyclical arrangement occurring above the annular chamber walls. 

 Although some of the granulations are decidedly small, their size in 

 general is about the same as those more centrally situated. The 

 cross section of many of them is subrectangular. 



Embryonic apparatus reniform. Initial chamber subspherical, 

 about lOO^i in diameter; distance across both chambers through the 

 center of the initial chamber about 200jU. Wall about lOjU thick. 

 The embryonic chambers are typical for the genus. 



Equatorial chambers rectangular, in definite annuli. The width 

 of the annuli increases toward the periphery; it is from 24ju to 40^ 

 near the center and as much as 200^* at the periphery. The 

 chambers near the center are almost square, but become elongate 

 rectangles toward the periphery, where the transverse diameter is 

 between 40 /x and 50/u and the radial diameter as much as 200/^; that 

 is, the radial is four or five times the transverse diameter. The 

 equatorial layer at the center of the test is so thin that it almost 

 pinches out; the height of the chambers may be less than S/j,; at the 

 periphery the height is as much as 24ju. The roofs and floors are 



