328 Transactions of tfie Society. 



366. Discorbina eximia Hantken. 



Discorbina eximia Hantken, 1875, Mittheil. Jahrb. d. k. ung. geol. Anstalt., 



vol. iv. p. 76, pi. xv. fig. 8. 

 Discorbina elegans Hantken, 1875. Id., p. 76, pi. ix. fig. 3. 

 Discorbina eximia (Hantken) Brady, 1884, Foram. 'Challenger,' p. 616, 



pi. Ixxxviii. fig. 9. 



One small specimen, fossil, which appears to be referable to this 

 species, i uiginally described from the Tertiaries of Hungary. In the 

 recent condition it appears to be confined to shallow water in the 



tropics. 



367. Discorbina imequilateralis sp. n. 



(Plate XI. figs. 3-5.) 



The curious little specimen which we figure is so very distinctive 

 in its appearance that it seems to merit a specific name, although 

 its occurrence is so far limited to a single well preserved fossil 

 specimen. The marked distinctive feature of the shell is the dis- 

 similarity between its upper and under surfaces. The superior 

 surface is in one plane and consists of about two convolutions, 

 six or seven chambers in the outer whorl. The inferior surface 

 is smaller, so that the shell when viewed on edge presents the 

 appearance of a horizontal conic section. The superior surface is 

 rough, owing to the fact that the perforations are abnormally large 

 for such a small species, the sutural lines somewhat depressed, 

 giving a " puckered " appearance to the surface of the shell. Viewed 

 side wise, the chambers are observed to be coarsely corrugated from 

 edge to edge. The inferior surface is depressed, sinking away from 

 the corrugated edge to a median line, running across the axis of 

 the shell ; this causes the central depression to be oval or elliptic, 

 and not circular, as is usually the case. The perforations on the 

 sides and base are very minute when compared with those on the 

 apex of the shell ; the septal divisions are not visible on the sides 

 or inferior surface, and the general appearance of the inferior surface 

 resembles Spirillina rather than Discoroiim. 



Length, 0-23 mm. Breadth, - 2 mm. 



368. Discorbina nitida Williamson sp. 



Rotalina nitida Williamson, 1858, Eecent Foram. of Gt. Britain, p. 51, pi. iv. 



figs. 106-108. 

 Ditto. (Williamson) Terquem, 1875, Ess. Aniin. Plage Dunkerque, pt. i. 



p. 26, pi. ii. fig. 9. 

 Rotalia nitida (Williamson) Brady, 1884, Foram 'Challenger,' pp.627, 705. 

 Ditto. (Williamson) Brady, 1887, Synopsis British Recent Foraminifera. 

 Discorbina nitida (Williamson) Wright, 1891, Proc. E. Irish Acad., ser. 3, 



vol. i. No. 4, p. 490. 

 Ditto. (Williamson) Sidebottom, 1908, Foram. from Delos, Mem. Manchester 



Lit. and Phil. Soc, vol. lii. No. 13, p. 13, pi. iv. fig. 6. 



