Becerit Foraminifera off the East Coast of Australia.. 255 



Two excellent examples occur, which agree best with the 

 " Keriraba " illustration in the above reference, but the tubercles 

 on the superior surface of the test are much more numerous, 

 practically covering the whole surface, and giving a beautiful 

 appearance to this interesting species. The sutures are slightly 

 sunk and almost hidden by the tubercles, which are arranged in 

 lines on either side. 



Discorbina biconcava Parker and Jones. 



Discorbina biconcava Parker and Jones, 1865, Phil. Trans., vol. civ, p. 422 



pi. xix, fig. 10. 

 D. biconcava Brady, 1884, Chall. Eept., p. 653, pi. xci, fig. 2. 



A single small specimen, more compressed than the type-form 



Discorbiyia lingulata Burrows and Holland. 



Discorbina lingulata Burrows and Holland, Foram. Crag., 1895, pt. ii, Pal. 



Soc, p. 297, pi. vii, figs. 33, a-c. 

 D. biconcava Brady, 1884, Chall. Kept., p. 653, pi. xci, fig. 3. 



Six immature tests occur. 



Discorbina lingulata Burrows and Holland, var. unguiculata nov. var. 



(PI. VI, figs. 12-14.) 



The inferior surface corresponds with that of the type-form, but 

 the chambers on the superior surface are keeled, and sometimes 

 instead of lying flat are more or less tilted up. Six were found. 

 Mr. Earland kindly suggested the varietal name. 



Discorbina involuta sp. n. (PI. VI, figs. 15-17.) 



Superior surface convex, or more or less flattened. The septse 

 between the chambers are produced as highly limbate walls ; the 

 surface between the limbate sutures is tuberculate. Inferior 

 surface flat, the internal septse hardly visible on either surface. 

 The number of chambers in the out- whorl is probably about seven. 

 Subsidiary septiC project from the outer margin into the interior of 

 the chambers, between the upper and lower walls. In the adult 

 stage the test is opaque. 



Nearly the whole of the above description is taken from notes 

 kindly sent to me by Mr. Earland, to whom I submitted specimens, 

 and who has spent considerable time on their examination. He 

 also points out that no doubt with the increase in size of the test 

 the number of the subsidiary septie would liecome more numerous, 

 and eventually the chambers would become semi-labyrinthic. 

 Personally, I think the subsidiary septse are the foundation of the 

 numerous tubercles which appear on the superior surface. The 

 test chosen for illustration is one of the flatter specimens. 



