40 



BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



most marked toward the umbilicus, remaining portion of surface 

 finely but distinctly punctate; aperture a narrow slit on the inner 

 margin of the chamber ventrally from the peripheral margin. 



Diameter up to 1.5 mm. 



Distribution. — Brady records this from the Challenger station off 

 the Philippines in 95 fathoms. Bagg records it from a single Alba- 

 tross station, H4476 in 438 fathoms off the Hawaiian Islands. I 

 have it from a single station in the same region Albatross H2683 in 

 770 fathoms, a few poor specimens, and from Albatross D4874 in 66 

 fathoms off Japan. 



TRUNCATULINA MARGARITIFERA H. B. Brady. 

 Plate 17, fig. 1. 



Truncatulina margaritifera H. B. Brady, Quart. Journ. Micr. Sex., vol. 21, 1881, 

 p. 66; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 667, pi. 96, fig. 2 a-e. 



Description. — "Test Rotaliform; superior face slightly convex or 

 nearly flat, inferior convex; peripheral edge sharp, subcarinate, 



a b 



Fig. 43.— Truncatulina margaritifera H. B. Brady. (Adapted from Brady's type 



FIGURE. X 28. a, VENTRAL VIEW; b, DORSAL VIEW; C, SIDE VIEW. 



more or less lobulated; consisting of three convolutions, of which 

 the last has about twelve segments ; segments all visible on the supe- 

 rior face, only those of the final convolution on the inferior. Sutural 

 lines on both faces marked by rows of exogenous beads of clear shell- 

 substance, largest near the center of the test; walls conspicuously 

 foraminated. 



"Diameter l/20th inch (1.27 mm)." 



Distribution. — The only published North Pacific record for this 

 species is that of Brady from the Challenger station off the Philippines 

 in 95 fathoms. Apparently this belongs to the f auna already several 

 times mentioned which in the North Pacific reaches into the Philip- 

 pine Archipelago from the south and farther north to Japan as it 

 was found at Albatross station D4874 in 66 fathoms and D4946 in 39 

 fathoms, bottom temperature 68.7° F. 



The Japanese specimens were hi every way typical and of good size. 



