FORAMINIFERA OF THE ATLANTIC OCEAN 



23 



included here. Some of the figured specimens from the Indo-Pacific 

 show that they are not the same as the North Atlantic species. 



DISCORBIS GLOBULARIS (d'Orbigny), var. ANGLICA, new variety 



Plate 4, figures 10 a-c 



Discorbina irregularis Heron-Allen and Earland (not Rhumbler), Proc. 

 Roy. Irish Acad., vol. 31, pt. 64, 1913, p. 120, pi. 10, figs. 2-4; Journ. Roy. 

 Micr. Soc, 1916, p. 50. 



Variety differing from the tj^pical in having the later chambers 

 much expanded and irregular. 



Holotype of variety (Cushman Coll. No. 12809) from Goldseeker 

 dredging, 3 miles off Nose Head, Moray Firth, 69 meters. 



This form recorded by Heron-Allen and Earland is apparently 

 definitely related to D. globularis so far as our specimens show, and 

 seems to be different from Rhumbler 's species from Laysan. 



DISCORBIS MAMILLA (Williamson) 



Plate 5, figures 1 a-c 



Rotalina mamilla Williamson, Rec. Foram. Gt. Britain, 1858, p. 54, pi. 4, 

 figs. 109-111. 



Discorbina mamilla Heron-Allen and Earland, Proc. Roy. Irish Acad., 

 vol. 31, pt. 64, 1913, p. 123, pi. 11, figs. 4-6; Trans. Linn. Soc. London, 

 ser. 2, vol. 11, 1916, p. 271; Journ. Roy. Micr. Soc, 1916, p. 50; 1930, p. 183. 



Test plano-convex, spire low but definite, sides nearly straight or 

 slightly convex, periphery subacute, slightly lobulate; chambers dis- 

 tinct, usually five in the last-formed whorl, regularly increasing in 

 size, slightly overlapping on the ventral side; sutures distinct, flush 

 with the surface on the dorsal side, ventrally somewhat depressed, 

 strongly curved; wall very coarsely perforate, otherwise smooth, the 

 periphery thickened into a rounded keel with coarse tubulations; 

 aperture ventral, near the umbilicus. 



Diameter about 0.35 mm. 

 2305—31 3 



