100 



BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



depressed; wall calcareous, smooth; aperture broad and short, loop- 

 like or oval on the inner face of the chamber; color, white. 



Length, 0.40-0.80 mm. 



Distribution. — Brady records this species from two North Pacific 

 stations, in 95 fathoms, off the Philippines and, in 345 fathoms, on the 

 Hyalonema-ground south of Japan. I have had specimens from 

 Nero station 1464, in 891 fathoms, near Guam; station 170, in 1,990 

 fathoms, off Midway Island, and station 2049, in 2,226 fathoms, near 

 the Hawaiian Islands. There is a single specimen of this species 

 from Tuscarora station 47, in 1,499 fathoms, in the Western Pacific. 

 This species is interesting in showing the development of an uncoiled 

 form, a process which is carried still farther by the following. 



CASSIDULINA PARKERIANA H. B. Brady. 



Cassidulina parkeriana H. B. Brady, Quart. Journ. Micr. Sci., vol. 21, 1881, p. 59; 

 Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 432, pi. 54, figs. 11-16.— 

 Egger, Abh. kon. bay. Akad. Wiss. Miinchen, CI. n, vol. 18, 1893, p. 304, 

 pi. 7, fig. 37. 



Description. — Test elongate, cylindrical, the very early portion spi- 

 rally coiled, the later chambers forming an uncoiled biserial series, 

 making up the larger part of the test, circular in crosssection ; chambers 

 broad and high, considerably inflated; sutures much depressed; wall 

 calcareous, smooth ; aperture very 

 broad and short, occasionally sub- 

 circular, often with a broad tooth- 

 like plate nearly filling the opening; 

 color, white. 



Length, 0.50-0.65 mm. 



Distribution. — This species has not 

 been previously recorded from the 

 North Pacific. Brady's specimens 

 were dredged by the 

 Challenger among the 

 islands on the west 

 coast of Patagonia, 

 and our specimens are 

 from the same coast 

 of the Pacific. Single 

 specimens were ob- 

 tained at Albatross 

 stations D2S06, in 1,379 fathoms, near the Galapagos, and D3608, in 

 276 fathoms, in the Bering Sea. 



The species carries the uncoiling to an extreme and develops a 

 cylindrical test with the aperture nearly terminal and rounded, but 

 keeps to the biserial condition, although in some specimens the 

 chambers nearly separate those adjacent. 



-Cassidulina parkeriana. X 50. a, apertural view; 

 b, ventral view; c, dorsal view. 



