254 Transactions of the Society. 



the marginal edge, except in very small specimens, slightly raised. 

 The inferior surface is almost flat, except towards the umbilical 

 region, where it is sunk. On this surface the perforations show 

 conspicuously. The aperture appears to be arched. The test, 

 when full-grown, carries a well-developed keel. The final chamber 

 extends to about three-quarters of the circumference. 



I think there is no doubt that this form is the one figured 

 by Brady, 1884, in the "Challenger" Eept., pi. xc, fig. 4, as " Z>. 

 rarescens (?) " It differs totally from D. rarescens, having a circular 

 outline, long narrow chambers, and conspicuous perforations on 

 the under-surface. In Brady's figure the long chambers are faintly 

 indicated, also their raised edges. This form occurs more frequently 

 in the material than D. rarescens, ten specimens being found. 



Discorbina patelliformis Brady. 



Discorbina patelliformis Brady, 1884, Chall. Kept., p. 647, pi. Ixxxviii, 

 fig. 3 ; pi, Ixxxix, fig. 1. 



The specimens are very small and agree best with the 

 " Challenger " illustration, pi. Ixxxviii, fig. 3, but two out of the 

 four found are more conical. 



Discorbina tuberculata Balkwill and Wright. 



Discorbifia tuberculata Balkwill and Wright, 1885, Eept. Eec. Foram. 



Coast of Dublin and Irish Sea, Trans. Roy. Irish Acad., vol. xxviii, 



p. 350, pi. xiii, figs. 28-30. 

 D. tuberculata Sidebottom, 1904, etc., Eept. Eec. Foram. Coast of Isl. 



Delos, Mem. Manchester Lit. and Phil. Soc, pt. v, vol. lii, 1908, 



p. 15, pi. V, fig. 5. 



The six examples that occur are quite typical. 



Discorbina tuberculata B. & W., var. acuta nov. (PI. VI, figs. 6-8.) 



This is evidently a variant of D. tuberculata, in which the 

 tubercles on the superior surface are confined to the acute peripheral 

 and inner edges of the chambers. 



The superior surface is less convex than in the type-form, and 

 the sutures, which have a jagged appearance, are not so deeply 

 sunk. The under-surface of the test is more convex than the 

 superior, and the tubercles are more normally placed. 



Disoorbina pustulata Heron-Allen and Earland. (PL VI, figs. 9-11.) 



Discorbina jyustulata Heron-Allen and Earland, 1913, Clare Island Survey, 



Proc. Eoy. Irish Acad., vol. xxxi, pt. Ixiv, Foram., p. 129, pi. xii, 



figs, 5-7. 

 D. pustulata Heron-Allen and Earland, 1915, Foram. Kerimba Archipelago, 



pt. ii. Trans. Zool. Soc. London, vol. xx, pt. xvii, p. 701, pi. lii, 



figs. 24-26. 



