20 



BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



Brady described it from shallow water material of the South Sea 

 Islands. 



DISCORBIS BERTHELOTI (d'Orbigny). 

 Plate 7, fig. 3. 



Rosalina bertheloti d'Orbigny, in Barker, Webb, and Berthelot, Hist. Nat. Isles 

 Canaries, vol. 2, pt. 2, "Foraminiferes," 1839, p. 135, pi. 1, figs. 28-30. 



Discorbina bertheloti H. B. Brady, Trans. Linn. Soc. London, vol. 24, 1864, p. 469, 

 pi. 48, figs. 10a, b; Rep. Voy. Challenger, Zoology, vol. 9, 

 1884, p. 650, pi. 89, figs. 10-12.— H. B. Brady, Parker, 

 and Jones, Trans. Zool. Soc, vol. 12, 1888, p. 227, pi. 46, 

 figs. 7, 8. — Egger, Abh. kon. bay. Akad. Wiss. Miinchen, 

 CI. ii, vol. 18, 1893, p. 387, pi. 15, figs. 10-12.— Flint, 

 Rep. U. S. Nat. Mus., 1897 (1899), p. 327, pi. 72, fig. 4.— 

 Millett, Journ. Roy. Micr. Soc, 1903, p. 702. — Rhum- 

 bler, Zool. Jahrb., Abt. Syst., vol. 24, 1906, p. 70 — 

 Chapman, Journ. Quekett Micr. Club, ser. 2, vol. 10, 1907, 

 p. 135. — Sidebottom, Mem. and Proc Manchester Lit. 

 and Philos. Soc, vol. 54, No. 16, 1910, p. 26.— Bagg, 

 Bull. U. S. Geol. Surv., No. 513, 1912, p. 80, pi. 28, 

 figs. 10, 11a, 6. 

 Discorbina berthelotiana MacDonald, Ann. Mag. Nat. Hist., 

 ser. 2, vol. 20, 1857, p. 193, pi. 6, fig. 25.— Goes, Kongl. 

 Svensk. Vet. Akad. Handl., vol. 19, pt. 4, 1882, p. 107, 

 pi. 8, figs. 266-268; vol. 25, No. 9, 1894, p. 93, pi. 15, 

 fig. 790; Bull. Mus. Comp. Zool., vol. 29, 1896, p. 69. 

 Discorbina turbo, var. parisiensis, subvar. berthelotiana Parker 

 and Jones, Philos. Trans., vol. 155, 1865, p. 387, pi. 16. 

 figs. 26, 27. 



Description. — Test oval, plano-convex, much com- 

 pressed; peripheral margin acute, sometimes slightly 

 carinated; dorsal surface nearly flat, ventral side 

 somewhat convex ; chambers five to seven in the final 

 whorl, often slightly carinate at the border; sutures slightly depressed, 

 distinct; wall smooth, punctate; aperture a narrow slit at the inner 

 margin of the chamber on the ventral side. 

 Diameter 0.40-0.80 mm. 



Distribution. — Brady mentions this species as found in the North 

 Pacific but does not give stations. Rhumbler records single speci- 

 mens both from Chatham Island and Laysan. I have had a few 

 specimens from Nero station 990 off Guam in 859 fathoms. It has 

 also occurred at two Albatross stations off Japan, D4875 in 59 fathoms 

 and D4946 in 39 fathoms, bottom temperature 68.7° F. 



DISCORBIS RARESCENS (H. B. Brady). 



Plate 7, fig. 4. 



Discorbina rarescens H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 

 651, pi. 90, figs. 2, 3, and 4. — Egger, Abh. k6n. bay. Akad. Wiss. Munchen, 

 CI. ii, vol. 18, 1893, p. 388, pi. 15, figs. 45-47.— Chapman, Journ. Quekett 

 Micr. Club, ser. 2, vol. 10, 1907, p. 136. 



Fig. 23.— Discorb is 

 beetholoti (d'or- 

 bignt). (Adapted 

 from d'orbigny's 

 figure of the type. 



a, DORSAL VIEW; 6, 

 SIDE VIEW; C, VEN- 

 TRAL VIEW. 



