TROPICAL PACIFIC FORAMINIFERA OF ALBATROSS 47 



Genoholotype. — Articulma nitida d'Orbigny. 



Test with the early chambers quinqueloculine or triloculine, later 

 ones in a rectilinear series ; aperture in the adult a rounded, usually 

 elliptical opening, at the end of a short neck with a phialine lip. 



Lower Eocene to Recent. 



This genus has developed from a quinqueloculine ancestry by the 

 addition of a uniserial stage, which is represented only by one or two 

 chambers in some species, but in others these become numerous. 



ARTICULINA LINEATA H. B. Brady 



Plate 11, Figures 1, 2 



Articulina lineata H. B. Bradt, Rep. Voy. Challenger, Zoology, vol. 9, p. 183, 

 pi. 12, figs. 19-21, 1884.— Cushman, Proc. U. S. Nat. Mus., vol. 59, p. 73, pi. 

 18, fig. 6, 1921; Carnegie Inst. Washington Publ. 311, p. 70, pi. 12, fig. 4, 

 1922 ; U. S. Nat. Mus. Bull. 104, pt. 6, p. 52, pi. 11, figs. 8-10 ; pi. 12, fig. 1, 

 1929. 



Test much compressed, even in the earlier portion, which is triloc- 

 uline, the later portion consisting of one or two much compressed 

 chambers in linear arrangement, periphery usually keeled ; chambers 

 distinct, with numerous fine longitudinal costae; wall translucent, 

 of a bluish-white color; the aperture with a lip much thickened at 

 the edge, but not everted and not extending out beyond the periphery 

 of the chamber. Length, 0.8 mm. ; breadth, 0.3-0.4 mm. ; thickness, 

 0.12-0.15 mm. 



Brady's specimens were from off Kandavu, Fiji Islands, 210 

 fathoms and 255 fathoms, and he also had it from Raine Island, 

 Torres Strait, 155 fathoms. Brady also recorded the species from 

 off the Bermudas in 435 fathoms, and according to Nuttall the figured 

 specimens in the Challenger report are from this last locality. 



I have recorded this species from the West Indian region, but a 

 comparison of the Pacific and the Atlantic series of specimens seems 

 to show that there are decided differences. If the two are found on 

 further study to be different, the name lineata should be applied to 

 the Atlantic form, as the figured specimens are the Atlantic ones. 

 In the Pacific collections included in the present paper the most 

 numerous are from Mokaujar Anchorage, where it is very common. 

 Similar specimens have occurred also from Levuka, Fiji, in 12 

 fathoms, but specimens were not obtained from the other area from 

 which material was examined. 



ARTICULINA SULCATA Keuss(?) 

 Plate 11, Figures 3, 4 



Recent material from various regions has been referred to the above 

 species. Specimens consist typically of a quinqueloculine early stage 

 with one or two linear chambers with a decided neck and the surface 



