TROPICAL PACIFIC FORAMINIFERA OF "ALBATROSS" 43 



Table 23. — Nonion houeanum — material examined 



NONION SUBTURGIDUM (Cushman) 



Plate 10, Figures 4-7 



Nonionina subturgida Cushman, Carnegie Inst. Washington Publ. 342, p. 47, 

 pi. 16, fig. 2, 1924. 



Test bilaterally symmetrical, compressed, last-formed coil com- 

 posed of 8 or 9 chambers, greatly increasing in length as added, the 

 last-formed one extending the entire length of the test; periphery 

 rounded; sutures very slightly depressed, distinct; apertural face 

 broadly rounded, umbilical area often filled with secondary material; 

 aperture at the base of the last-formed chamber at the median line. 

 Length, up to 0.65 mm; breadth, 0.45-0.5 mm; thickness, 0.16-0.25 

 mm. 



This species was originally described from off Samoa. It has proved 

 to be the most common species in the region from which our material 

 came, at least in shallow water. We have specimens from off Nairai, 

 Fiji, 12 fathoms, common; Viva Anchorage, Fiji, 3 fathoms, common; 

 and off Rotonga, common. There is some variation in the width 

 of the apertural face, and in the extent of involution of the last-formed 

 chambers. 



NONION GRATELOUPI (d'Orbigny) (?) 



Plate 10, Figures Sa-c 



There are a few specimens from Guam Anchorage in 21 fathoms, and 

 from Mokaujar Anchorage, Fiji, which resemble this species, which 

 is characteristically developed in the shallow water of the West 

 Indian region. These Pacific specimens, while of the same general 

 shape as those of the Atlantic, are much smaller in size, the figured 

 specimen being only about 0.2 mm in length; breadth, 0.12 mm; 

 and thickness, 0.07 mm. , 



This may represent a distinct species developed in the shallow 

 water of the Pacific region. 

 155091—33 4 



