FORAMINIFERA OF THE PHILIPPINE AND ADJACENT SEAS. 393 



Description. — "Test discoidal, biconcave, peripheral edge nearly 

 square; convolutions very numerous and very narrow near the center; 

 spinal septal wall thick, and marked externall}^ by a raised limbate 

 line. 



"Diameter, one-fiftieth of an inch (0.5 mm.) or rather more." 



Brady described this species from specimens dredged in the "warm 

 area" of the Faroe Channel. It is known from the work of Howchin, 

 and especially that of Chapman, to be "to be the most abundant of 

 the Oomusinrae in the Tertiaries of southeastern Australia." Egger 

 records it in recent dredgings from Gazelle stations off Mauritius and 

 off western Australia. Therefore it is not surprising to find it present 

 in the Albatross Philippine material. 



The specimen figured by Brady has a broader and more irregular 

 thickening than our specimens. The few I have had agree very 

 closely with that figured by Chapman as noted in the reference above. 

 Except for this difference the specimens are very much alike. They 

 were microspheric, as were Brady's and Chapman's figured speci- 

 mens. The squarely truncate peripheral margin is very evident. 



The species was rare at two stations — D5236, off the east coast of 

 Mindanao in 494 fathoms (903 meters), and D5348, Palawan Passage, 

 in 375 fathoms (686 meters). 



Comtispira crassisepta — Materials examined. 



Genus OPTHALMIDIUM Zwingli and Kubler, 1870. 



OPTHALMIDIUM INCONSTANS (H. B. Brady). 



Plate 78, figs. 2, 3. 



Hauerina inconstans H. B. Brady. Quart. Journ. Micr. Sci., vol. 19, 1879, p. 54. 

 Opthalmidium inconstans H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 



1884, p. 189, pi. 12, figs. 5, 7, 8.— Cushman, Bull. 71,U. S. Nat. Mus., pt. 6, 1917, 



p. 28, pi. 3, figs. 1-4. 



Except at one station, D5236, where specimens were fairly frequent, 

 the species has occurred only as scattered specimens: Sulu Sea; 

 Verde Island Passage; east coast Mindanao; off northwestern Panay; 

 southern Luzon; Palawan Passage; also from Sibuko Bay, Borneo 

 (stations D5585, 5586), and D5637 in 700 fathoms (1,280 meters), 

 vicinity of Bouro Island. The depths in the Archipelago proper 

 range from 201 to 494 fathoms (368 to 903 meters), the greater depth. 



