32 



BULLETIlSr 104, UNITED STATES NATIONAL MUSEUM, 



Distribution. — Brady gives three Atlantic stations for this dcUcate 

 species, Porcupine station 37, 2,435 fathoms, and ''two other locah- 

 ties in the North Atlantic, at depths of 630 and 1,125 fathoms, 

 respectively." Heron- Allen and Earland record it from two stations 

 off the west of Scotland, making the first record from British waters 

 and mention the fact that it is "common in deep water off the Irish 

 and west Scottish coasts." Pearcey records it from diatom ooze 

 in the Antarctic 2,103 and 2,180 fathoms. Heron-Allen and Earland 

 record it from the Kerimba Archipelago off the southeastern coast of 

 Africa "attached to an oyster shell in shallow water." The majority of 

 them were simple tubes, the remainder furcating irregularly. As the 

 original description says "free" and as it is a dichotomously branch- 

 ing form from cold waters it is suggested that the Kerimba attached 

 material from shallow, warm tropical waters may be another thing. 



Brady's material showed a very large per cent of silica making up 

 the test in alcoholic or dried material. The amount of chitinous 

 material is sufficient, however, to make the test very flexible. On 

 drying specimens are very easily broken and in dried dredged material 

 only small fragments are usually present. Such fragmentary speci- 

 mens have occurred at a few Albatross stations in the western Atlan- 

 tic, four southward of Georges Bank and one off the Central American 

 coast in the Caribbean Sea. One station is in 382 fathoms, the others 

 from 1,582 to 1,917 fathoms. 



Rhizammina algaefonnis— material examined. 



Locality. 



37 56 20 N.; 70 51 SOW. 

 13 34 45 N.; 81 21 10 W. 



37 25 00 N.; 73 06 00 W. 



38 20 00 N.; 70 08 SOW. 

 38 29 30 N.; 70 57 00 W. 



Depth 



in 

 fath- 

 oms. 



1,917 

 382 

 1,582 

 1,859 

 1,631 



Bot- 

 tom 

 tem- 

 pera- 

 ture. 



45.75 

 36.8 



Character of 

 hottom. 



Abundance. 



glob. OE I Rare. 



wh. crs. s . . . I Rare. 



br. m ' Rare. 



br. oz I Rare. 



br. oz. tor...i Rare. 



RHIZAMMINA INDIVISA H. B. Brady. 



Plate 12, figs. 7-10. 



Rhizammina ijidivisa H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p.277. pl.29, figs. 5-7.— Egger, Abh. Bay. Akad. Wiss. Munchen, vol. 18, 1893, 

 p. 256, pi. 4, fig. 17.— Chapman, Proc. Zool. Soc. London, 1895, p. 14.— Goes, 

 Bull. Mils. Comp. Zool., vol. 29, 1898, p. 20.— Flint, Rep. U. S. Nat. Mus., 

 1897 (1899), p. 272, pi. 15, fig. 2.— Rhumbler, Arch. Prot., vol. 3, 1903, p. 

 252, fig. 91 (in text).— Cushman, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 34, 

 fig. 24 (in text).— Pearcey, Trans. Roy. Soc. Edinl)urgh, vol. 49, 1914, p. 999. 



Marsipellaindivisa Eimer and Fickert, Zeitschr. Wiss. Zool., vol. 65, 1899, p. 668. 



Description. — Test free, cylindrical, somewhat flexible, often taper- 

 ing near the ends; wall composed of chitinous material, thin, with a 

 variable amount of sand grains or more often other foraminiferal 

 tests attached to the exterior; open ends of the tube serving as the 

 apertures. 



