60 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



264 to 2,615 fathoms. Between Guam and Yokohama at the Nero 

 stations where a record was kept it was present at nearly every station. 

 The specific name truncatulinoides antedates micheliniana and so 

 must be adopted, as has been done by some writers. This is one of 

 the characteristic constituents of the Globigerina ooze in the North 

 Pacific as elsewhere. 



PULVINULINA UMBONATA (Reuss). 

 Plate 27, fig. 2. 



Rotalina umbonata Reuss, Zeitschr. deutsch. geol. Ges., vol. 3, 1851, p. 75, pi. 5, 

 fig. 35a-c. 



Pulvinulina umbonata Reuss, Deutsch. Akad. Wiss. Wien, vol. 25, 1866, p. 206. — 

 Hantken, Mitth. Jahrb. ung. geol. Anstalt., vol. 4, 1875, p. 77, pi. 9, fig. 

 8a-c. — Terrigi, Atti Accad. Pont. Nuovi Lincei, vol. 35, 1883, p. 200, pi. 4, 

 figs. 45, 46.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 695, pi. 105, fig. 2a-c. — Egger, Abh. kon. bay. Akad. Wiss. Miinchen, 

 CI. ii, vol. 18, 1893, p. 410, pi. 18, figs. 19-21.— Flint, Rep. U. S. Nat. Mus. 

 1897 (1899), p. 330, pi. 74, fig. 4. 



Description. — Test small, sides unequally convex, the dorsal side 

 much less convex than the ventral; peripheral margin acute; chambers 

 five or six in the last-formed coil; sutures nearly straight, radial, 

 distinct but not depressed; wall smooth, finely punctate; aperture 

 a narrow slit extending from the umbilicus to the peripheral margin 



Diameter about 0.50 to 0.75 mm. 



Distribution. — Brady records this species from three Challenger 

 stations in the North Pacific at depths ranging from 345 to 3,125 

 fathoms. Flint records it from Albatross station D3080 in 93 fathoms 

 off the coast of Oregon. 



I have seen it only from a Nero station, 1207 in 665 fathoms off the 

 coast of Japan. 



PULVINULINA EXIGUA H. B. Brady. 



Plate 23, fig. 5. 



Pulvinulina exigua H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 696, pi. 103, figs. 13, 14.— Goes, Bull. Mus. Comp. Zool., vol. 29, 1896, 

 p. 75. — Sidebottom, Mem. and Proe. Manchester Lit. and Philos. Soc., 

 vol. 54, No. 16, 1910, p. 28. — Chapman, Journ. Linn. Soc, Zoology, vol. 30, 

 1910, p. 422. 



Description. — Test small, almost equally convex on the two sides; 

 peripheral margin bluntly rounded, often lobulated; chambers com- 

 paratively few, five or six in the last formed whorl; sutures above as 

 well as the border of the whorl in the early portion marked by clear 

 shell material, on the ventral side depressed and not so marked; 

 wall finely punctate; aperture a narrow slit running from the 

 peripheral margin to the umbilicus. 



