FORAMINIFERA OF THE NORTH PACIFIC OCEAN. 65 



Description. — Test small, nearly equally convex, dorsal side slightly 

 more conical, ventral side broadly rounded ; peripheral margin acute, 

 carinate; chambers numerous, nine or ten in the last-formed coil, 

 short; sutures strongly curved, slightly depressed above, strongly 

 limbate below, the umbilical ends uniting to form an umbonate mass; 

 wall punctate without variegated markings ; aperture a short some- 

 what arched opening on the ventral side toward the peripheral 

 margin. 



Diameter 0.40-0.75 mm. 



Distribution. — Bagg records this species from a single Albatross 

 station H4568 in 1 ,274 fathoms off the Hawaiian Islands. I have had 

 it from several Albatross stations also off the Hawaiian Islands, depths 

 ranging from 266 to 618 fathoms. 



PULVTNULINA FAVUS H. B. Brady. 



Pulvinulina favus H. B. Brady, Geol. Mag., dec. 2, vol. 4, 1877, p. 294; Rep. 

 Voy. Challenger, Zoology, vol. 9, 1884, p. 701, pi. 104, figs. 12-16.— Egger, 

 Abh. kon. bay. Akad. Wiss. Munch en, CI. n, vol. 18, 1893, p. 417, pi. 18, 

 figs. 13-15. 



Description. — Test biconvex, lenticular, the two faces nearly 

 equally convex; peripheral margin subacute, slightly rounded; cham- 

 bers numerous, about 12 in the last formed whorl, elongate; sutures 

 oblique, entirely hidden by the surface ornamentation which is com- 

 posed of a raised reticulated network covering the entire test except 

 that portion of the periphery about the aperture which is usually 

 just ventral to the peripheral margin, slightly oblique, oval. 



Diameter 0.75 to 1.25 mm. 



Distribution. — This species has previously been noted from but one 

 North Pacific station ; Brady recording it from Challenger station 224 

 in 1,850 fathoms in lat. 7° 45' N. 



I have found it to be very common, especially in the region between 

 Guam and Yokohama, where it was recorded at about 50 stations, 

 after which recording was stopped, as it occurred at nearly every 

 station. The recorded stations range in depth from 847 to 2,250 

 fathoms, the average depth being about 1,800 fathoms with but one 

 station less than 1,250 fathoms. It also occurred eastward at Nero 

 station 124 in 1,726 fathoms and at Tuscarora station 221° 07' N; 

 158° 14' W. in 1,468 fathoms. 



It is a striking species with its peculiar type of ornamentation. 

 Apparently it is most common at considerable depths, from 1,500 to 

 2,000 fathoms, and is widely distributed in the western portion of the 

 Pacific, coming eastward to the central portion. 



