270 MESSES. E. HEKON-ALLEN AND A. EARLAND ON THE 



264. Discorbina millettii, Wright. 



Discorbina millettii, Wright, 1910-11, ECM. p. 13, pi. ii. figs. 14-17. 



Heron-Allen & Earland, 1913, CI. p. 121, pi. x. figs. 5-7. 



4 Stations. 



Extremely rare, the best individuals occurring at Stn. 3. The species has only been 

 recorded by us ut supra, and by Wright from post-Tertiary deposits. It has probably 

 been included in some of the British i*ecords of D. nilida, the characteristic beading of 

 the under surface requiring careful diagnosis to separate it from that form. 



265. Discorbina praegeri, Heron-Allen & Earland. 



Discorbina praegeri, Heron-Allen & Earland, 1913, CI. p. 122, pi. x. figs. 8-10. 

 Heron-Allen & Earland, 1914, etc., FKA. 1915, p. 692. 



19 Stations. 



Almost universally distributed. The usual variations occur, connecting the species on 

 the one side with D. rosacea and on the other with D. nittda. 



266. Discorbina peruviana (d'Orbigny). 



Rosalina peruviana, d'Orbigny, 1839, FAM. p. 41, pi. i. figs. 12-14. 



Discorbina peruviana, Heron-Allen & Earland, 1913, CI. p. 122, pi. xi. figs. 1-3. 



3 Stations. 



Very sparingly distributed compared with D. rosacea, but often running into that 

 form. This is one of the d'Orbiguyan species revived by us for taxonomic purposes, 

 having probably been frequently included under D. rosacea. 



267. Discorbina rosacea (d'Orbigny). 



Rotalia rosacea, d'Orbigny, 1826, TMC p. 273. No. 15, Modele No. 39. 

 Discorbina rosacea, Brady, 1884, FC. p. 644, pi. lxxxvii. figs. 1, 4. 



Heron-Allen & Earland, 1913, CI. p. 124, pj. xi. figs. 7-9. 



21 Stations. 



Almost universally distributed and generally extremely common. The best indi- 

 viduals at Stns. 10, IS, and 20. There is an immense range of variation, specimens 

 linking the type with D. praegeri, D. peruviana, and D. turbo occurring at many Stns. 



268. Discorbina planorbis (d'Orbigny). 



Asterigerina planorbis, d'Orbigny, 1846, FFV. p. 205, pi. xi. figs. 1-3. 

 Discorbina planorbis, Heron-Allen & Earland, 1913, CI. p. 124, pi. xi. figs. 10-12. 



8 Stations. 



Verv unevenly distributed. Very common at some of the Stns. at which it occurs. 

 Intermediate forms linking the species with I), mamilla are abundant. This species, 

 revived by us ut supra, has probably been recorded by British authors under D. turbo. 



