• FORAMINIFERA OF THE ATLANTIC OCEAN 

 Spirillina viviparn, var. densepundaia — Material examined 



SPIRILUNA VIVIPARA Ehrenberg, rar. RUNIANA Heron-Allen and Earland. 



See Heron-Allen and Earland (Journ. Roy Micr. Soc, 1930, p. 179, 

 pi. 4, figs. 51-53). Described from the west of Scotland. 



SPIRILLINA PERFORATA (Schultze) 



Plate 1, figures 6, 7 



Cornuspira perforata Schultze, Organ. Poly., 1854, p. 41, pi. 2, fig. 22. 

 Spirillina perforata Williamson, Rec. Foram. Gt. Britain, 1858, p. 92, 



pi. 7, fig. 202. — Terquem, Ess. Anim. Plage Dunkerque, 1875, p. 21, 



pi. 1, fig. 5. 



Test rather regularly planispiral, coils regularly increasing in 

 diameter as added, not flattened, periphery rounded; suture distinct, 

 depressed; wall coarsely and rather evenly pitted, the central portion 

 sometimes with thickened areas of secondary deposit obscuring the 

 earlier wall; aperture formed by the open end of the chamber. 



Diameter 0.45 mm. 



The specimens I have from the Western coast of Europe seem to 

 be distinct from those of the West Indian region, especially those 

 from the coast of Belgium figured here. The pits of the surface are 

 of smaller size and much more even in their placing on the surface. 

 There is also a tendency to secondary thickening not noted in West 

 Indian S. vivipara Ehrenberg. 



Terquem records this species from the Eocene of the Paris Basin, 

 but the fossil form is probably distinct. 



SPIRILUNA MARGARITIFERA Williamson 



Plate 1, figure 11 



Spirillina margariiifera Williamson, Rec. Foram. Gt. Britain, 1858, p. 93, 

 pi. 7, fig. 204.— Terquem, M6in. Soc. Geol. France, s^r. 3, vol. 1, 1878, 

 p. 10; Ess. Anim. Dunkerque, 1881, p. 110, pi. 13, figs. 2a,h. 



Spirillina tuberculata H. B. Brady (part). Rep. Voy. Challenger, Zoology, 

 vol. 9, 1884, p. 631 (not pi. 85, figs. 12-16).— Balkwill and Wright, 

 Trans. Roy. Irish Acad., vol. 28, Sci., 1885, p. 349.— Siddall, Proc. Lit. 

 Philos. Soc. Liverpool, 1886, p. 70 (list). 



Test planispiral, the coils rather uniformly increasing in diameter 

 as added, periphery rounded; wall ornamented by numerous project- 

 ing tubercles arranged in either one or two series; aperture formed 

 by the open end of the tubular chamber. 



Diameter 0.50 mm. 



