22 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



sutures depressed; wall smooth and finely punctate; aperture an 

 oval opening at the umbilical border of the chamber. 



Diameter 0.40-0.85 mm. 



Distribution. — No other records exist for the North Pacific for 

 this species other than that of Brady, who obtained it from Challenger 

 material off the Philippines in 95 fathoms. 



DISCORBIS VENTRICOSA (H. B. Brady). 



Plate 13, fig. 1. 



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

 654, pi. 91, figs. 7a-c. — Egger, Abh. kon. bay. Akad. Wiss. Munchen, CI. 

 ii, vol. 18, 1893, p. 392, pi. 15, figs. 54-57. 



Description. — "Test free, oblong, rounded, more or less depressed; 

 composed of less than two complete convolutions, the outer whorl 



— sass*-' a o c 



Fig. 26.— Discorbis ventricosa (H. B. Beady). X 50. o, ventral view; b, dorsal view; c, side 

 view. (After type figures by Brady.) 



consisting of six or seven segments, the successive segments increas- 

 ing rapidly in length; septal faces ventricose, especially that of the 

 final chamber; sutures excavated. Superior face hispid externally, 

 inferior smooth; umbilicus deeply sunk, valvular flaps but little 

 developed. 



"Diameter about l/50th inch (0.5 mm.)." 



Distribution. — This species has not previously been recorded from 

 the North Pacific. I have a fine typical specimen from Albatross 

 station D4922 in 60 fathoms, off Blake Keef, in Colnett or Vincennes 

 Strait, off southern Japan. This extends considerably the pre- 

 viously known range in this region. 



This seems to be a very typical species as far as can be judged by 

 the specimen noted above, which is so near like the figure given by 

 Brady that it might almost have been the original of that figure. 



DISCORBIS IRREGULARIS (Rhumbler). 



Plate 13, figs. 2, 3. 



Discorbina irregularis Rhumbler, Zool. Jahrb. Abt. Syst., vol. 24, 1906, p. 70, 

 pi. 5, figs. 57, 58. 



Description. — Attached, lower side smooth, flattened, upper side 

 rough, convex, consisting of several coils, the first coil or two regu- 



