Recent Foraminifera off the East Coast of Australia. 253 



Discorbina bertheloti (d'Orbigny). 



Rosalind bertheloti d'Orbigny, 1839, Foram. Canaries, p. 135, pi. 1, figs. 28-80. 

 D. bertheloti Brady, 1884, Chall. Kept., p. 650, pi. Ixxxix, figs. 10-12. 



The smaller specimens, with one exception, are notable for the 

 strong limbation along the margins of the segments ; the larger 

 ones are more normal in this respect and lead up to the largest 

 example present, which appears to me to be the D. bertheloti, 

 var. haconica Hantken, var. as figured by Brady (1884, Chall. Eept., 

 p. 651, pi. xc, fig. 1), and which he states to be an unimportant 

 variety. 



Discorbina bertheloti (d'Orbigny) var. complanata nov. var. 



(PI. VI, figs. 1-3.) 



Test much depressed, superior surface slightly convex, inferior 

 surface very slightly concave. Seven to eight chambers, narrow 

 and curved, in the outer whorl. Sutures limbate, heavily so on 

 the margins of the earlier chambers. Periphery bordered and 

 acute. The tests are in beautiful condition, and are semi- 

 transparent. I think there is no doubt that this interesting form 

 is closely allied to the D. bertheloti (d'Orbigny). I submitted 

 specimens to Mr. Earland, who writes me as follows : — 



" The peculiar sigmoid sweep of the chambers is rather striking. 

 If the specimens are wetted you will see that there is excessive 

 and radially increasing limbation of the sutures .... The flatness 

 of your specimens is their striking feature." Ten occur. 



Discorbina ojpercularis (d'Orbigny). 



Rosalina opercularis d'Orbigny, 1826, Ann. Sci. Nat., vol. vii, p. 271, No. 7. 

 B. opercularis d'Orbigny, 1839, Foram. Cuba, p. 93, pi. iii, figs. 24, 25 ; 



pi. iv, fig. 1. 

 Discorbina opercularis Brady, 1884, Chall. Eept., p. 650, pi. Ixxxix, figs. 8, 9. 



The tests are dull and opaque. They are identical w4th the 

 " Challenger " specimens. 



Discorbina rarescens Brady. 



Discorbina rarescens Brady, 1884, Chall. Kept., p. 651, pi. xc, figs. 2, 3. 

 D. rarescens Egger, 1893, Abhandl. k. bayer. Akad. Wiss., cl. ii, vol. xviii, 

 p. 388, pi. XV, figs. 45-47. 



Six examples of this thin-shelled Discorbina were found. 



Discorbina circularis, sp. n. (PI. VI, figs. 4, 5.) 



Discorbina rarescens Brady, 1884, Chall. Kept., p. 651, pi. xc, fig. 4(?). 



Test circular in outline ; superior surface highly convex and 

 glassy in appearance ; chambers long, narrow and curved, with 



