FOBAMTNIFERA OF THK ATF ANTIC OCEAN. 21 



KHABDAMMINA DISCRLTA H. R. Brady. 



Plate 11, fig. 1. 



Rhnhdo})h>tra species G. M. Dawson, Can. Nat., vol. 5, 1870, p. 177, tig. 7. 



Rhabdopleiira abyssonim G. M. Dawson, Amer. Joiim. Soi., vol. 1, 1871. p. 208, 

 fig. 7: Ann. Mag. Nat. Hist., ser. 4, vol. 7, 1871, p. 8tt, fig. 7. 



Rhabdarnmino discreta H. B. Brapy, Quart. Joum. Micr. Sci., vol. 21, 1881, p. 48; 

 Rep. Voy. Challmger, Zoology, vol. 9, 1884, p. 268, pi. 22, figs. 11-13.— Ciiap- 

 mak, Proc. Zonl. Soc. London, 1895, p. 14. — Goiis, Bull. Mus. Comp. Zool., 

 vol. 29, 1898, p. 21, pi. ], fi,gH. 13, 14.— Flint, Rep. U. S. Nat. Mus., 1897 

 (1899), p. 271, pi. 13.— EniEK and Fickert, Zeitschr. \Vi.s.s. Zool., vol. fi5, 

 1899, p. 688.— Rhumbler, Arch. Prot., vol. 3, 1903, p. 283, fig 105 (in text).— 

 Bagq, Proc. U. S. Nat. Mas., vol. 34, 1908, p. 125.— Oushman, Bull. 71, U. S. 

 Nat. Mus., pt. 1, 1910, p. 27, fig. 13 (in text).— Pearcey, Trans. Roy. Soc. 

 Edinburgh, vol. 49, 1914, p. 998. 



Descnption. — Test free, straight, cylindricsil, constricted somewhat 

 at irregular intervals exteriorty, but the chamber ■\;Ndthin of nearly 

 uniform diameter throughout; wall composed of sand grains firmly 

 cemented, exteriorly rough but the interior rather smoothly finished; 

 open end^ of the tube serving as apertures; color variable, depending 

 upon the material used in the constructioji of the test. 



Lengtli, indefinite, up to 25 mm. 



Distrihution. — It has been thought that this species is rather char- 

 acteristic of cold water. It is found off Greenland from 350 to 1,000 

 meters (Goes) and Brady records it from the same region in 20 

 fathoms. Pearcey records it as typical and in plenty in 2,620 and 

 2,700 fathoms in the Antarctic, Fhnt records it from the western 

 Atlantic, Albatross D2731, in 781 fathoms off Chesapeake Bay, 



In the Albatross material I have been able to examine it has 

 occurred from the latitude of Georges Banks southward along the 

 coast, in the Gidf of Mexico, the Carribboan Sea, and»off the coast of 

 South America, Depths range from 410 to 2,045 fathoms and 

 bottom temperatures from 35,7° to 45.75° F. 



It is worth noting that it is lacking in the material I have examined 

 from the very cold water north of the Newfoundland Banks, and 

 Awerinzew does not record it in his paper in the Siberian material. 

 It therefore is probably not as much limited to cold temperatures 

 as has been supposed. 



Specimens always give the impression that they are broken and 

 incomplete as though they were but the arms of some larger arenace- 

 ous form that is broken in dredging ])Ut this may be only suggestive. 



