28 



BULLETIN 104, UNITED STATES NATIONAL MUSEUM 



Discorbina orbicularis H. B. Bradt, Rep. Voy. Challenger, Zoology, vol. 9, 

 1884, p. 647, pi. 88, figs. 4-8. — Balkwill and Wright, Journ. Micr., 

 vol. 3, 1884, p. 22, pi. 4, fig. 13.— Siddall, Proc. Lit. Philos. Soc. Liver- 

 pool, 1886, p. 70 (list). — H. B. Brady, Parker, and Jones, Trans. Zool. 

 Soc. London, vol. 12, 1888, p. 227, pi. 46, fig. 1.— Halkyard, Trans. 

 Manchester Micr. Soc, 1889, p. 69. — Chaster, First Rep't. Southport 

 Soc. Nat. Sci., 1890-91 (1892), p. 65.— Egger, Abhandl. kon. bay. Akad. 

 Wiss. Miinchen, CI. II, vol. 18, 1893, p. 389, pi. 15, figs. 16-18, 76-78.— 

 Woodward, The Observer, vol. 4, 1893, p. 176. — Silvestri, Mem. 

 Accad. Pont. Nuovi Lincei, vol. 9, 1893, p. 211; Atti Accad. Sci. Acireale, 

 vol. 7, 1896, p. 78.— Goiis, Bull. Mus. Comp. Zool., vol. 29, 1896, p. 69.— 

 Wright, Irish Nat., vol. 9, 1900, p. 55.— Chapman, Journ. Linn. Soc. 

 Zool., vol. 28, 1902, pp. 191, 208, 405; Journ. Roy. Micr. Soc, 1903, 

 p. 699. — Earland, Journ. Quekett Micr. Club, ser. 2, vol. 9, 1905, p. 

 221.— Dakin, Rep't. Pearl Oyster Fish. Ceylon, 1906, p. 238.— Millett, 

 Rec. Foram. Galway, 1908, p. 6, pi. 4, fig. 13. — Sidebottom, Mem. Proc. 

 Manchester Lit. Philos. Soc, vol. 52, No. 13, 1908, p. 13, pi. 4, fig. 7; 

 vol. 54, No. 16, 1910, p. 25. — Heron-Allen and Earland, Proc. Roy. 

 Irish Acad., vol. 31, pt. 64, 1913, p. 126. — Pearcey, Trans. Roy. Soc. 

 Edinburgh, vol. 49, 1914, p. 1026. — Heron-Allen and Earland, Trans. 

 Zool. Soc. London, vol. 20, 1915, p. 693. — Chapman, Biol. Res. Endeavour, 

 vol. 3, pt. 1, 1915, p. 29. — Heron-Allen and Earland, Trans. Linn. 

 Soc London, ser. 2, vol. 11, 1916, p. 271; Journ. Roy. Micr. Soc, 1916, 

 p. 50; British Antarctic Exped., Zoology, vol. 6, 1922, p. 200; Bull. Soc. 

 Sci. Hist. Nat. Corse, 1922, p. 135. 



Discorbis orbicularis — Material examined 



Test plano-convex, the dorsal side forming a low cone, ventrally 

 flat or more often somewhat concave, circular in outline, periphery 

 acute; chambers elongate, each often making nearly half of the cir- 

 cumference, distinct; sutures slightly depressed, distinct; wall finely 

 to coarsely perforate, smooth; aperture ventral, an elongated open- 



