42 



BULLETIN 11, UNITED STATES NATIONAL MUSEUM. 



Diameter up to 1.0 mm. 



Distribution. — Goes records this species from two Albatross stations, 

 D3353, in 695 fathoms and D3433, in 1,218 fathoms, in the western 



Fig. 45.— Truncatulina mundula H. B. Brady, Parker and Jones. (Adapted from Brady's 



FIGURE.) X 40. O, DORSAL VIEW; b, VENTRAL VIEW; C, SIDE VIEW. 



tropical Pacific. Bagg records it from a single Albatross station, 

 D4000, in 104-213 fathoms, off the Hawaiian Islands. 



Genus SIPHONINA Reuss, 1849. 



Rotalia (part) Czjzek, Haidinger's Nat. Abh., vol. 2, 1848, p. 145. 



Siphonina, Reuss (type, S. reticulata (Czjzek)), Denkschr. Akad. Wiss. Wien, 



vol. 1, 1850, p. 372. 

 Planorbulina (part) Parker and Jones, Philos. Trans., vol. 155, 1865, p. 379. 

 Truncatulina (part) H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 



p. 669. 



Description. — Test free, composed of numerous chambers arranged 

 in a somewhat irregular spiral, rounded or biconvex, perforate; wall 

 smooth or ornamented; aperture rounded, usually with a short neck 

 and phialine lip. 



This genus seems to be worthy of separation from Truncatulina by 

 its apertural characters alone. There are two North Pacific species 

 which are here described. 



SIPHONINA ECfflNATA (H. B. Brady). 

 Plate 18, figs. 1-1. 



Planorbulina echinata H. B. Brady, 

 Quart. Journ. Micr. Sci., vol. 19, 

 1879,p. 69, pi. 8, fig. 31a-c. 



Truncatulina echinata H. B. Brady, Rep. 

 Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 670, pi. 96, figs. 9-14.— Egger, 

 Abh. kon. bay. Akad. Wiss. Mi'in- 

 chen, CI. n, vol. 18, 1893, p. 403, pi. 

 16, figs. 40, 41. 



Description. — "Test nearly spherical; consisting of about two con- 

 volutions, of which the outermost is composed of four segments; 

 segments ventricose, unequally arched, embracing. Shell coarsely 



Figs. 46, 47.— Sd?honina echinata (H. B. 

 Brady). X 100. (After Brady.) 



