POLYMORPHINA TURGIDA. 269 



PoLTMOEPHiNA TTJEGIDA, Eeuss, 1870. Sitzungsb. k. Akad. Wiss. Wien, vol. Isii, 



I Abtheil., p. 4S7, No. 10. (After 

 Scblicht's figures.) 



Characters. — Shell snbrotuncl, rounded-oblong in outline, being nearly equally 

 rounded at the ends, with almost straight parallel sides. Both in vertical and 

 transverse section it is compressed and bluntly oval (shortest in the latter) ; 

 chambers four (?), oblique, gibbose, and closely set with indistinct septal lines. 



Reuss's fig. 66 in pi. vi (1855), closely resembles this compact Pohjmorphma, 

 except in being more oval. Fig. 9 in Schlicht's pi. xxviii, and fig. 2 in pi. xxix, 

 are more circular in transverse section, but otherwise express the subrotund form 

 of our specimen. Taken altogether, the Pohjmorph'uia under notice is certainly 

 within the probable range of variation of P. furr/ida, Reuss. 



P. {glohnlhia) globosa, von Miinster, described and figured by F. A. Romer in 

 the ' Neues Jahrbuch,' &c., 1838, p. 386, pi. iii, fig. 33, evidently belongs to the 

 same group as the above. It is " nearly round, smooth, with scarcely dis- 

 tinguishable chambers," and is slightly compressed. 



P. rotundata, Bornemann (1855, 'Zeitsch. Deutsch. Geol. Ges.,' vol.vii, p. 346, 

 pi. xviii, fig. 3, copied in the ' Trans. Linn. Soc.,' vol. xxvii, p. 234, woodcuts, 

 figs, k, I, m), is a long-oval form, closely allied to the foregoing. 



An obovate variety is recognised in the ' Challenger ' Report, p. 570, pl.lxxiii, 

 figs. 5 — 8. Other varieties are shown by Dr. A. Goes, ' K. Svensk. Akad. 

 Handl.,' vol. xxv. No. 9, p. 57, pi. ix, figs. 529—534. 



Polymorjphina solidula, Terquem, ' Mem. Soc. Geol. France,' ser. 3, vol. i, 

 Mem. 3, 1878, p. 40, pi. iii (viii), figs. 31 n, h, is another member of the same 

 group of compact, subrotund, compressed forms. 



Occurrence. — P. fiirgida comes from the Oligocene Septaria-clays of Germany, 

 and P. globosa also from the younger Tertiaries of Northern Germany. The 

 figured specimen (PL V, fig. 25), from the Crag of Sutton, is in the British 

 Museum. 



P. rotundata, mentioned above as a closely allied form, is not common in the 

 recent condition. It has been found, according to the ' Challenger' Report, off 

 the western coast of Scotland, and off the north-east of Ireland ; in the 

 Mediterranean off Malta ; off Prince-Edward Island, Southern Ocean (50 to 150 

 fathoms) ; at one station in the North Pacific (1850 fathoms) ; and in the Soutli 

 Pacific (1825 fathoms). Dr. Goes has it among the Arctic Foraminifera. 



Fossil specimens have been recorded from the Oligocene (Septaria-clays) of 

 Hermsdoi'f and Pietzpuhl, and from the Miocene of Kostej in the Bauat, Hungary. 



