TROPICAL PACIFIC FORAMINIFERA OF "ALBATROSS" 



13 



Specimens are rare in the material examined, our figured specimen 

 coming from Albatross Station H3961, center south coast of Tarawa, 

 10 miles N., in 413 fathoms. 



DENTALINA sp. (?) 



Plate 3, Figures 5a, b 



The large distinct specimen figured is from Albatross Station 

 H3891, latitude 16° 30' S., longitude 143° 41' W., in 540 fathoms, and 

 while it may represent an abnormal form, it seems worthy of being 

 figured. The early portion has very oblique sutures which are not 

 depressed, while the later portion consists of inflated chambers with 

 somewhat depressed limbate sutures. 



Genus NODOSARIA Lamarck, 1812 



Nodosaria Lamarck, Extrait du cours de zoologie, p. 121, 1812. 



Genotype. — By designation, Nautilus rajphanistrum Linnaeus. 



Test with the chambers in a straight linear series, the chambers 

 distinct, not strongly embracing; sutures normally at right angles 

 to the axis; wall calcareous, finely perforate, glassy; aperture central 

 and terminal, radiate, often with a chamberlet below with a rounded 

 opening into the main cavity of the chamber, Triassic to Recent. 



Table 7. — Nodosaria perversa — material examined 



The earliest forms that are recorded as Nodosaria have simple 

 rounded openings and apparently have not yet developed the aper- 

 tural chamberlet with its radiate and terminal aperture. 



NODOSARIA PERVERSA Schwager 



Plate 3, Figures 13-15 



Nodosaria perversa Schwager, Novara-Exped., Geol. Theil, voL 2, p. 212, pi. 5, 

 fig. 29, 1866. 



