FORAMINIFERA OF NORTH PACIFIC OCEAN. 



51 



PLEUROSTOMELLA SUBNODOSA (Reuss). 



Nodosaria nodosa Reuss (part), Verst. Bohm. Kreid., pt. I. L845, p. 28, pi. 13, 



fig. 22. 

 Dentalina subnodosa Reuss (part), Haidinger's Nat. Abhandl., vol. 1, 1850, p. 24, 



pi. 1, fig. 9. 

 Pleurostomella subnodosa Reuss, Sitz. Akad. Wiss. Wien, vol. 40, L860, p. 204, 



pi. 8, fig. 2a, b.—R. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 



p. 412, pi. 52, figs. 12, 13.— Chapman, Proc. Zool. Soc. London. L895, p. 25. 



Description. — Test much elongated, very slightly compressed, nearly 

 cylindrical, hardly tapering, the apical end broadly rounded, the 

 apertural end subacute in front view, rounded in side view; chambers 

 several, the very early ones biserial, the 

 later uniserial, but with oblique sutures 

 showing the traces of the biserial condi- 

 tion; aperture fairly broad; sinus broad 

 with slight projections at each side; color 

 white. 



Length 0.65-0.90 mm. 



Distribution. — Apparently this species is 

 more common in the North Pacific than the 

 preceding. It was found 

 in material from Tuscarora 

 station 2, in 1,468 fath- 

 oms, in the southwestern 

 Pacific, Nero station 842, 

 in 1,330 fathoms, off the 

 coast of Luzon, Philippine 

 Islands, and at Nero sta- 

 tions 1294 and 1299, in 

 1.417 and 1,817 fathoms, 

 south of Japan. 



The early portions of the test show biserially arranged chambers 

 and the later ones while uniserial are really a biserial series, which 

 shove one another apart, as is seen by the arrangement of the sutures 

 and the wedge-shaped chambers alternating from side to side as 

 added. 



PLEUROSTOMELLA SPINOSA, new species. 



Description. — Test broad, abruptly tapering to the acute spinose 

 apical end; chambers several, greatly increasing in size in the adult, 

 broad and much inflated, the sutures deep; surface with numerous 

 very short subacute spines, either over all the chambers or limited 

 to the earlier ones; aperture with the sinus a narrow slit with bluntly 

 rounded short teeth at the sides; color white. 



Length 0.50-0.70 mm. 



Fig. 82.— Pleurostomella subnodosa. a, aperture. 



X 150; b, FRONT VIEW; c, SIDE VIEW. X 75. 



