EXPLANATION OF PLATE 87 (LXXXVII) 



Figs. 1, 6, 7, X 100; Fig. 2, X 35; Figs. 3, 8, X 60; Fig. 4, X 50; Fig. 5, X 75. 

 Figure 1. — Conorboides advena (Cushman). 



Challenger Sta. 218A, Admiralty Islands, Pacific. (16-25 fathoms) 

 Referred by Brady to Discorbina rosacea (d'Orbigny) and by Cushman (Carnegie Inst., Washington, Publ. 

 311, 1922, p. 40) to Discorbis advena. Bermudez has figured it as Discopulvinulina advena (Bol. de Geol., Cara- 

 cas, Venezuela, Vol. 2, No. 4, 1952, pi. 3, fig. 1) but it is clearly not congeneric with bertheloti, and Hofker 

 (Siboga Exped., Foraminifera Pt. Ill, 1951, p. 418) has listed it as Conorbis (not Conorbis Swainson; later re- 

 named Conorboides). 

 Figure 2. — Discorbis sp. nov. 



Shore sand, Melbourne, Australia; or. Challenger Sta. 187A, off Booby Island, Pacific. (8 fathoms) 

 Referred by Brady to Discorbina vesicularis (Lamarck), and by Parr (Proc. Roy. Soc. Victoria, n.s., Vol. 44, 

 Pt. 2, 1932, p. 227) to Discorbis vesicularis var. dimidiata (Parker and Jones). Later (B.A.N.Z. Antarctic Res. 

 Exped., 1929-1931, Ser. B, Vol. 5, No. 6, 1950, p. 353) Parr listed it as Discorbis dimidiatus (Parker and Jones). 

 Bermudez (Bol. de Geol., Caracas, Vol. 2, No. 4, 1952, p. 39) then erected the genus LameUodiscorbis with 

 Discorbina dimidiata Parker and Jones as genotype, reproducing the present figure of Brady as that species. 

 Hornibrook and Vella (The Micropal., N.Y., Vol. 8, No. 1, 1954, p. 27) after a study of Australian material 

 and Paris Basin Eocene specimens of D. vesicularis reached the conclusion that Parr (1. c. supra, 1932) was 

 dealing with three species, LameUodiscorbis dimidiatus (Parker and Jones) (distinct from Brady's figure under 

 discussion here), and two new species of Discorbis, one of which is that shown here, and the other that figured 

 by Brady as Discorbina rosacea (d'Orbigny) on the present plate, figure 4. These two species have not yet 

 been named. 

 Figure 3. — Valvulineria rugosa (d'Orbigny). 



Challenger Sta. 185, Torres Strait, Pacific. 

 Referrred by Brady to Discorbina rugosa (d'Orbigny). Placed in Discorbis by Cushman (U.S.N.M., Bull. 

 100, Vol. 4, 1921, p. 306) and referred here to Valvulineria. 

 Figure 4. — Discorbis sp. nov. 



Challenger Sta. 162, Bass Strait, Pacific. (38-40 fathoms) 

 Referred by Brady to Discorbina rosacea (d'Orbigny) and by Cushman (U.S.N.M., Bull. 71, Pt. 5, 1915, 

 p. 13) to Discorbis. Bermudez (Soc. Cienc. Nat. "La Salle", Caracas, Venezuela, Vol. 12, No. 32, 1952, p. 206) 

 placed it in Asterigerinata. It does not appear to be the same as d'Orbigny's Rotalia rosacea and will be dis- 

 cussed in a forthcoming paper by Hornibrook and Vella (see also Hornibrook and Vella, The Micropal., N.Y., 

 Vol. 8, No. 1, 1954, p. 28). 

 Figures 5-7. — Discorbis australis Parr. 



Fig. 5. Challenger Sta. 162, Bass Strait, Pacific. (38-40 fathoms) 

 Fig. 7. Challenger Sta. 172, off Fiji, Pacific. (18 fathoms) 

 Referred by Brady to Discorbina valvulata (d'Orbigny) and by Parr (Proc. Roy. Soc. Victoria, n.s.. Vol. 44, 

 Pt. 2, 1932, p. 227) to Discorbis australis. 

 Figure 8. — Discorbina (?) mira (Cushman). 



Challenger Sta. 352A, off Cape Verde Islands, Atlantic. (11 fathoms) 

 Referred by Brady to Discorbina turbo (d'Orbigny), the type of Discorbina Parker and Jones, 1862. Cush- 

 man (Carnegie Inst., Washington, Publ. 311, 1922, p. 39) referred this figure to Discorbis mira. The ventral 

 surface suggests Discorbis but that genus lacks the umbilical plug indicated in this species, and it appears closer 

 to Discorbina. Discorbina is usually placed in synonymy with Discorbis Lamarck, 1804, but Hornibrook and 

 Vella (The Micropal., N.Y., Vol. 8, No. 1, 1954, p. 26) have reinstated the genus of Parker and Jones, with 

 Rotorbinella Bandy, 1944, in synonymy. D'Orbigny (Ann. Sci. Nat., Vol. 7, 1826, p. 274) referred to Rotalia 

 (Trochuline) turbo, and the name Trochulina has since been used by Ehrenberg, 1840, and Basset, 1885, the 

 latter using it subgenerically with the specific name turbo. Loeblich and Tappan (personal communication) 

 regard Discorbina as a synonym of Discorbis and a junior synonym of Trochulina d'Orbigny 1840 (the latiniza- 

 tion of the name dating to Ehrenberg). The writer does not regard Discorbina as synonymous with Discorbis 

 Lamarck, but it is possible that the name Trochulina should be reinstated, and if so mira would be placed in 

 that genus. 



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