TKOPICAL PACIFIC FORAMINIFERA OF "ALBATROSS" 



Pacific, our only specimens occurring at Albatross Station D3690, 

 northwest face of Hao Atoll, 2 miles E., Paumotus, in 812 fathoms, 

 and Station H3914, northeast point of Nukutavake, 1 mile S., in 636 

 fathoms. 



ROBULUS NIGRISEPTUS (Koch) 



Plate 1, Figures 9a, b 



Crisiellaria nigrisepta Koch, Ber. Schweiz. Pal. Ges., vol. 19, no. 3, p. 740, fig. 14 

 (in text), 1926. 



Test strongly biconvex, involute, the periphery acute, sometimes 

 with a slight keel, especially on the earlier portion; chambers elongate, 

 strongly curved, 7 or 8 in the final coil; sutures very strongly limbate, 

 peculiarly formed with a distinct angle toward the inner end; wall 

 smooth, finely perforate; aperture radiate, somewhat extended, with 

 a ventral slit. Diameter, 1.1 mm; thickness, 0.5 mm. 



Our specimens seem to be identical with this species described from 

 the Middle Tertiary of East Borneo. The sutures are variable in the 

 degree of limbation, but the peculiar angle of the chambers is evident, 

 and the last-formed chamber is often very small, as indicated in our 

 figure, and also in the type figure given by Koch. The species is 

 rare at all the stations at which it was found, but it has occurred at 

 several of these, as shown in Table 3. 



Table 3. — Robulus nigrisepius — material examined 



ROBULUS VORTEX (Fichte! and Moll) 



Plate 2, Figures la, h 



''Nautili globuli" Soldani, Testaceographia, vol. 1, pt. 1, p. 66, pi. 59, fig. tt^ 



1789. 

 Nautilus vortex Fichtel and Moll, Test. Micr., p. 3.3, pi. 2, figs, d-i, 1803. 



