90 



BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



Fig. 125.— R e o p h a x 

 aduncus. X SO. 



This differs from the other species of Reophax, and when its early 

 development is known, may be placed elsewhere. It has the appear- 

 ance of the later chambers of certain attached species which later 

 become free or coiled species, straightening out in their later develop- 

 ment. Flint's figures show specimens 

 of identical character with those ob- 

 tained by the Challenger. 



REOPHAX MEMBRANACEUS H. B. Brady. 



Reophax membranacea H.B.Brady, Quart. 

 Journ. Micr. Sci., vol. 19, 1879, p. 53, 

 pi. 4, fig. 9; Rep. Voy. Challenger, Zo- 

 ology, vol. 9, 1884, p. 297, pi. 32, figs. 

 1-4. — Millett, Journ. Roy. Micr. Soc, 

 1899, p. 255, pi. 4, fig. 14. 



Description. — Test elongate, slender, 

 tapering, straight or slightly curved, 

 consisting of from five to ten subcylin- 

 drical, elongated chambers, slightly 

 tumid in the middle; walls thin, chit- 

 inous, of a brown color; length up to 

 1.4 mm. 



Distribution. — Brady records this 

 species from Challenger station 238 in 3,950 fathoms off 

 Japan and in the volume on the " Summary of Kesults" 

 it is questionably recorded from the next station, 237, in 1,875 fath- 

 oms. I have found specimens in material from three Nero stations, 



1012, 1021, 1030, in 1,932- 

 2,112 fathoms, north of 

 Gu am. Specimens were 

 very rare. 



These specimens, one of 

 which is figured here, are 

 more like the specimens 

 figured by Brady than those 

 figured by Millett. The 

 walls are very thin and clean. 



REOPHAX BILOCULARIS Flint. 



Reophax bilocularis Flint, 

 Rep. U.S. Nat. Mus., 1897 

 (1899), p. 273, pi. 17, fig. 2. 



Description. — Test com- 

 posed of two chambers in a 

 straight line or set at an angle, chambers oval, walls of foreign mat- 

 ter, sand and largely of tests of other Foraminifera, surface irregu- 

 lar, aperture at the end of a tubular neck. 

 Length up to 2.5 mm. 



Fig. 12G— Reo- 

 phax MEM- 

 BRANACEUS. 

 X 200. 



Fig. 127.— Reophax bilocularis. X 25, a, front view; 



6, SIDE VIEW SHOWING THE OBLIQUITY OP THE CHAMBERS. 



