28 



BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



Ladrone Islands, in 2,475 fathoms. The Albatross obtained this 

 species at two stations in the 1906 cruise — D4979, in 943 fathoms, 

 south of Honshu Island, Japan, and D5026, in 119 

 fathoms in the Okhotsk Sea. Bagg records the species 

 from station H4502 in 1,342 fathoms near the Hawai- 

 ian Islands, but his specimen is a mere fragment, 

 poorly characterized. 



The specimen figured by Goes is not typical, but 

 there are larger typical specimens among his mounted 

 material from the same station. Brady speaks of the 

 occurrence of this species usually at considerable 

 depths, but in the far north off the coast of Greenland 

 in 20 fathoms and in the far south off Kerguelen 

 Island at 120 fathoms. He also gives a suggestion 

 that the distribution may be more or less affected by 

 the temperature of the ocean bottom. In this con- 

 nection it is interesting to observe that the only North 

 Pacific station for this species at all shallow, 119 fath- 

 oms, in the Okhotsk Sea, had a bottom temperature of 

 30.4° F., a low temperature even for ocean bottom 

 conditions, colder even than the deeper stations where 

 this species occurs. 



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% 



; 









mm 



RHABDAMMINA LINEARIS H. B. Brady. 



Rhabdammina linearis H. B. Brady, Quart. Journ. Micr. Sci., 

 vol. 19, 1879, p. 37, pi. 3, figs. 10, 11.— Butschli, in Bronns 

 Klassen und Ordnungen des Thierreichs, vol. 1, 1880, p. 194, 

 pi. 5, fig. 10. — H. B. Brady, Rep. Voy. Challenger, Zoology, 

 vol. 9, 1884, p. 269, pi. 22, figs. 1-6.— A. Agassiz, Bull. Mus. 

 Comp.Zool., vol. 29, 1888, p. 163, fig. 494 (in text) .—Goes, 

 Kongl. Svensk. Vet. Akad. Handl., vol. 25, no. 9, 1894, p. 

 18, pi. 4, figs. 65, 66.— Flint, Rep. U. S. Nat. Mus., 1897 

 (1899), p. 271, pi. 14, fig. 1.— Rhumbler, Arch. Protistk., 

 vol. 3, 1903, p. 262, fig. 104 (in text). 



Description. — Test free, elongate, straight or with 

 the arms at an angle; central chamber of larger diam- 

 fig. 13.— rhabdam- eter than the two elongated tubular arms, wall of the 

 mina disceeta. x central chamber thinner than that of the arms, com- 



25. 



posed of sand grains firmly cemented, apertures at 

 the distal ends of the tubes; color variable, from whitish to brown 

 according to the color of the sand of which it is composed. 

 Length 6-7 mm. 



