FORAMINIFERA OF THE ATLANTIC OCEAN. 



79 



species is hardly represented, but seems to be widely distributed, 



even in comparatively shallow water off the British Isles. Flint's 



specimens were from Albatross station D2352, 463 fathoms (847 



meters), off the western coast of Cuba. The only specimens I have 



had are from Albatross station D235o, in 399 fathoms (729 meters), 



a station nearby that from which Flint records it. Brady had this 



species from the Challenger material from three stations in the 



North Atlantic and two in the South Atlantic, mostly being in deep 



water. 



Gaudryina pseudofiliformis — material examined. 



Genus TRITAXILINA Cushman, 1911. 



Clavulina (part) H. B. Brady, Quart. Journ. Micr. Sci., vol. 21, 1881, p. 54. 

 Tritaxia (part) H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 390. 

 THtaxilina Cushman (type, T. caperata (H. B. Brady), Bull. 71, U. S. Nat. 

 Mus., pt. 2, 1911, p. 71. 



Description. — Test in its early development triserial, later becoming 

 biserial and in the adult uniserial; chambers numerous, distinct, 

 interior labyrinthic; wall arenaceous; aperture in the triserial portion 

 elongate with a valvular lip, at the edge of the inner side of the cham- 

 ber, in the adult central, terminal, usually with a series of peripheral 

 teeth projecting in and partially closing the opening. 



This genus includes the single species T. caperata H. B. Brady. 

 This differs from Tritaxia in the form of the test, the peculiar aperture 

 and the labyrinthic interior of the test. 



TRIT.\XILINA caperata (H. B. Brady), vsr. ATLANTICA, new variety. 



Plate 15, figs. 1, 2. 



Tritaxilina caperata H. B. Brady (part), Rep. Voy. Challenger, Zoology, vol. 9, 

 1884, p. 390, pi. 49, figs. 3o, h (not figs. 1, 2, 4, 5). 



Description. — Variety differing from the typical in the g(>neral 

 form of the test which in the triserial portion is less sharply triangular, 

 the apex blunty rounded, the areas between the chambers much 

 less excavated and distinct, uniserial portion not as well developed; 

 color instead of grayish, a light yellowish-brown. 



Distribution.— Tj^e-sY^^ciman (U.S.N.M. No. 16323) from Alba- 

 tross station D2150 in 382 fathoms (697 meters), Caribbean Sea. 

 Brady records T. caperata from two Atlantic Challenger stations from 

 off the Leeward Islands, station 23, 450 fathoms (823 meters). 



