EXPLANATION OF PLATE 90 (XC) 



Figs. 1-3, X 75; Figs. 4, 7, 8, 10, 11, X 100; Figs. 5, 6, X 40; Figs. 9, 12, X 90. 

 Figure 1. — Discopulvinulina baconica (Hantken)? 



Fig. la. Porcupine Sta. 17, West of Ireland, Atlantic. (1230 fathoms) 

 Figs, lb, c. Challenger Sta. VIII, off the Canaries, Atlantic. (620 fathoms) 

 Referred by Brady to Discorbina bertheloti var. baconica Hantken. This is regarded as a Discopulvinulina 

 but is it improbable that Brady was dealing with the same species as Hantken, which was obtained from the 

 Eocene of Hungary. It is probably new. 

 Figure 2, 3. — Planodiscorbis rarescens (Brady). 



Challenger Sta. 185, Torres Strait, Pacific. (155 fathoms) 

 Referred by Brady to Discorbina and by Cushman and others to Discorbis. Bermudez (Bol. de Geol., Caracas, 

 Venezuela, Vol. 2, No. 4, 1952, p. 40) erected the genus Planodiscorbis with rarescens as the genotype. Keijzer 

 (Leidse Geol. Med., Vol. 17, 1953, p. 279) has suggested that rarescens may belong to his genus Ruttenella. 

 If this should prove correct then Ruttenella will become a synonym of Planodiscorbis. 

 Figure 4. — Planodiscorbis circularis (Sidebottom). 



Challenger Sta. 185, Torres Strait, Pacific. (155 fathoms) 

 Referred by Brady to Discorbina, "carinate form possibly related to D. rarescens.'' This appears to be a 

 Planodiscorbis and was referred by Sidebottom (Jour. Roy. Micr. Soc, 1918, p. 253) to Discorbina circularis. 

 Figures 5, 6, 9-12. — Pileolina (?) wiesneri (Parr). 



Figs. 5, 10-12. Challenger Sta. 149D, Kerguelen Islands, S. Pacific. (20-60 fathoms) 

 Fig. 6. Challenger Sta. 149E, Kerguelen Islands, S. Pacific. (28 fathoms) 

 Referred by Brady to Discorbina parisiensis (d'Orbigny) and by Parr (B.A.N.Z. Antarctic Res. Exped. 

 1929-1931, Ser. B, Vol. 5, No. 6, p. 356) to Discorbis wiesneri. If the genus Pileolina be accepted (see Horni- 

 brook and Vella, The Micropal., N.Y., Vol. 8, No. 1, 1954, p. 25) and used for Discorbis-Vike forms with an 

 umbilicus, swept-back sutures and radiating lines of ventral papillae then this species would appear to belong 

 in that genus. 

 Figures 7, 8. — Rosalina concinna (Brady). 



Challenger Sta. 279C, ofT Tahiti, Pacific. (620 fathoms) 

 Referred by Brady to Discorbina. Cushman (C.C.L.F.R., Vol. 10, No. 4, 1934, p. 96) placed this species in 

 Tretomphalus but Bermudez (1. c. supra, 1952, p. 34) transferred it to Rosalina d'Orbigny. 



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