Recent and Fossil Foraminifera. 327 



14G. Globigerina pachyderma Ehrenberg. 



We have found very typical specimens of this boreal form, but 

 the figures we gave in Plate XVIII. figs. 4 and 5 (1909) were of 

 a new species of Nonionina, which we describe and figure again 

 post No. 390 and Plate XI. figs. 12-15. 



363. Spirillina lucida Sidebottom. 



Spirilllna hid, hi Sidebottom, 1908, Foraminifera from Delos, Mem. Man- 

 chester Lit. and Phil. Soc, vol. lii. No. 13, p. 9, pi. ii. fig. 9. 



We have several specimens, apparently derived fossils, which 

 answer to Sidebottom's description and figures. The structure, how- 

 ever, is very obscure, and in the absence of any visible aperture we 

 do not feel satisfied that the specimens may not represent the 

 superior external shell of some species of Discorbina in which the 

 septal divisions and base have been dissolved during a process of 

 plastogamy. 



364. Discorbina araucana d'Orbigny sp. 



Rosalina araucana d'Orbigny, 1839, Foram. Amer. Merid., p. 44, pi. vi. 



figs. 16-18. 

 Discorbina araucana (d'Orbigny) Parker and Jones, 1872, Quart. Journ. Geol. 



Soc, vol. xxviii. p. 115. 

 Ditto. (d'Orbignv) Brady, 1884, Foram. 'Challenger,' p. 645, pi. lxxxvi. 



figs. 10-11. 

 Ditto. (d'Orbigny) Sidebottom (1908), Foram. from Delos, Mem. Manchester 



Lit. and Phil. Soc, vol. lii. No. 13, p. 12. 



< )ne small well preserved specimen; a pyritized fossil. The 

 geological distribution of D. araucana is probably identical with 

 the more typical form D. rosacea, but the records are few. 



365. Discorbina bertheloti d Orbigny. 



Discorbina bertheloti d'Orbigny, 1839, Foram. Canaries, p. 135, pi. i. figs. 28-30. 

 Ditto. (d'Orbigny) Brady, 1864, Trans. Linn. Soc Lond., vol. xxiv. p. 469, 



pi. xlviii. fig. 10. 

 Ditto. (d'Orbigny) Bradv, 1884, Foram. 'Challenger,' p. 650, pi. lxxxix. 



figs. 10-12. 

 Ditto. (d'Orbigny) Bradv, 1887, Synopsis British l'ecent Foraminifera. 

 Ditto. (d'Orbigny) Flint, 1891), Pep. U.S. Nat. Museum for 1897, p. 327, 



pi. lxxii. fi.u. 4. 

 Ditto. (d'Orbigny) E-irland, 1905, Journ. Quefcett Micr. Club, ser. 2, vol.ix. 



No. 57, p. 223. 



A few examples, typical and apparently all fossil, some of them 

 highly pyritized, In the recent condition I). bertheloti has practi- 

 cally a world-wide distribution and ranges down to considerable 

 depths. It is more typically an arctic or, at any rate, a northern 

 form. Brady gives no information as to its occurrence in the fossil 

 condition. 



