TROPICAL PACIFIC FORAMINIFERA OF "ALBATROSS" 



11 



at least in the early stages, at or near the periphery but becoming 

 more nearly central in the last chambers. Jurassic to Recent. 



There is no sharp line of difference drawn between many species of 

 Dentalina and Nodosaria, as the obliquity of the sutures and the 

 curvature of the test are variable in the microspheric and megalo- 

 spheric forms of the same species. Some species, however, can defi- 

 nitely be placed in Dentalina, while it is much more difficult to place 

 the microspheric forms of Nodosaria. 



DENTALINA NEUGEBORENI (Schwager) 



Plate 3, Figures 2, 3 



Nodosaria neugehoreni Schwager, A^omra-Exped., Geol. Theil, vol. 2, p. 236, 

 pi. 6, fig. 67, 1866. 



Test elongate, slightly curved; chambers distinct, later ones becom- 

 ing slightly inflated; sutures distinct, slightly limbate, oblique in side 

 view; wall smooth, finely perforate; aperture radiate, at the periph- 

 eral angle, terminal. Length, 1.1 mm; breadth, 0.2-0.22 mm; 

 thickness, 0.18-0.2 mm. 



This species was described by Schwager from the Pliocene of Car 

 Nicobar, and our specimens seem to be identical with that of 

 Schwager. The species is very rare, but occurs at the Albatross 

 stations given in Table 6. 



Table 6. — Dentalina neugehoreni — material examined 



DENTALINA COSTAI (Schwager) 



Plate 3, Figure 6 



Nodosaria coslai Schwager, Novara-'Exped., Geol. Theil, vol. 2, p. 229, pi. 6, 

 fig. 62, 1866. 



Test elongate, slender, tapering, last-formed chamber distinct, 

 inflated; sutures distinct, slightly limbate, very slightly oblique; wall 

 smooth, finely perforate; aperture radiate, terminal, at the periph- 

 eral angle. Length, 1.8 mm; diameter, 0.2 mm. 



There are but two specimens in our material which can be referred 

 to this species of Schwager originally described from the Pliocene of 

 155091—33 2 



