16 



BULLETIN *7l, UNITED STATES NATIONAL MUSEUM. 



Fig. 17.— Discoebis concinna (H. B. Beady). X 100. 



a, DOESAL VIEW; b, SIDE VIEW; C, VENTRAL VIEW. 

 (AFTEE BEADY'S FIGUEE OF THE TYPE.) 



Distributio7i. — The only station from which I have had this species 

 is Nero 991 in 1,143 fathoms off Guam. 



DISCORBIS CONCINNA (H. B. Brady). 

 Plate 5, fig. 3. 

 Diseorbina concinna H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 646, pi. 90, figs. 7, 8.— Egger, Abb., kon. bay. Akad. Wiss. Miincben, CI. 

 ii, vol. 18, 1893, p. 388, pi. 15, figs. 22-24— Millett, Joura. Roy. Micr. Soc, 

 1903, p. 699. 

 Description. — Test free, outline circular, superior face convex, in- 

 ferior somewhat concave, peripheral edge angular, composed of some- 

 what more than two convolu- 

 tions, of which the latest con- 

 sists of from three to four seg- 

 ments. Earlier segments in 

 their superior aspect short 

 and radial, later segments 

 long and crescentif orm ; on 

 the inferior side the final seg- 

 ment occupying nearly half 

 the entire surface, umbilical 

 flaps distinct but not greatly developed. Walls very thin and con- 

 spicuously perforated, sutures marked by fine lines, neither depressed 

 nor limbate externally. 



Diameter l/100th inch (0.25 mm.). 



Distribution. — The only North Pacific record for this species is that 

 given by Brady in the Challenger report, off the Philippines, in 95 

 fathoms. From the other records given by Brady it seems as though 

 this species should be found in shallow water off southern Japan, but 

 it was not noted in the small amount of material available from this 

 region in the present work. The figure and description are from 

 Brady. 



DISCORBIS ORBICULARIS (Terquem). 



Plate 11, fig. 1. 



Rosalina orbicularis Terquem, Anim. sur la Plage de Dunkerque, 1876, p. 75, pi. 

 9, figs. 4a, b. 



Discorbis orbicularis Berthelin, Foram. de Borgneuf et Pornichet, 1878, p. 39, 

 No. 63. 



Diseorbina orbicularis H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 647, pi. 88, figs. 4-8. — Balkwill and Millett, Journ. Micr., vol. 3, 1884, 

 p. 23, pi. 4, fig. 13. — Balkwill and Wright, Trans. Roy. Irisb Acad., vol. 

 28 (Sci.), 1885, p. 349, pi. 13, figs. 31-33.— H.B.Brady, Parker, and Jones, 

 Trans. Zool. Soc, vol. 12, 1888, p. 227, pi. 46, fig. 1.— Terrigi, Mem. Accad. 

 Lincei, ser. 4, vol. 6, 1889, p. 115, pi. 17, figs. 2, 3. — Egger, Abb. k6n. bay. 

 Akad. Wiss. Munchen, CI. n, vol. 18, 1893, p. 389, pi. 15, figs. 16-18, 76-78.— 

 Jones, Pal. Soc, 1895, p. 295, pi. 7, fig. 31.— Mlllett, Journ. Roy. Micr. Soc, 

 1903, p. 699. — Sidebottom, Mem. and Proc Manchester Lit. and Philos. Soc, 

 vol. 52, No. 13, 1908, p. 13, pi. 4, fig. 7.— Chapman, Proc. Roy. Soc. Victoria, 

 vol. 22, 1910, p. 282. 



