FORAMINIFERA OF THE ATLANTIC OCEAN 7 



Test planispiral, very much compressed, usually slightly elliptical in 

 outline, periphery acute, often keeled and the keel broken into a series 

 of distinct teeth; coiled chamber with the cavity of the chamber near 

 the outer part of the coil, built out beyond the keel of the previous 

 coil; aperture elliptical at the end of the tubular chamber. 



Diameter 0.20-0.30 mm. 



This is a very interesting species which is apparently localized about 

 the British Isles and the coasts of France and Belgium and extending 

 into the Mediterranean, although Heron-Allen and Earland have 

 recorded it also from the Antarctic. 



Terquem evidently was the first to give a name to this peculiar 

 form in 1875. His figure like most of his illustrations is not detailed, 

 but he shows the thin plate-like keel with the main chamber on the 

 peripher}^ His specimens were from Dunkerque. Halkyard later 

 figured and described this from off Jersey, and there are numerous 

 other records as noted above. I have specimens from off the Belgian 

 coast, and thanks to Earland some from Porcupine Station 7, one of 

 which is here figured. 



The keel is often beautifully toothed or may be broken and only 

 represented by jagged angular bits. It is an extremely thin and 

 delicate species. 



Spirillina lateseptata — Material examined 



SPIRILUNA UMBATA H. B. Brady 



Plate 2, figures 2 a, b 



Spirillina Hmbata H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, 1879, p. 

 278, pi. 8, fig. 26 o, b; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 632, 

 pi. 85, figs. 18-21. — SiDDALL, Proc. Lit. Philos. Soc. Liverpool, 1886, p. 70, 

 (list). — Egger, Abhandl. kon. bay. Akad. Wiss. Miinchen, CI. II, vol. 18, 

 1893, p. 395, pi. 18, figs. 43, 44.— Flint, Rep't U. S. Nat. Mus., 1897 

 (1899), p. 326, pi. 71, fig. 5.— Chapman, Journ. Linn. Soc. Zool., vol. 28, 

 1902, p. 404 (list).— MiLLETT, Journ. Roy. Micr. Soc, 1903, p. 694.— 

 GoDDARD, Rec. Australian Mus., vol. 6, 1905-1908 (1908), p. 309.— Dakin, 

 Rept. Pearl Oyster Fish. Ceylon, 1906, p. 237.— Chapman, Subantarctic 

 Islands of New Zealand, 1909, p. 353; Biol. Res. Endeavour, vol. 3, pt. 1, 

 1915, p. 28.— Heron-Allen and Earland, Trans. Zool. Soc. London, vol. 

 20, 1915, p. 684.— CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 5, 1915, p. 5, 

 pi. 2, figs. 1, 2. — Heron-Allen and Earland, Journ. Roy. Micr. Soc, 



2305—30 2 



