FOKAMINIFEKA OF NOETH PACIFIC OCEAN. 31 



what appears to be siliceous cement, wall thick in comparison with 

 the diameter of the tube. 



Two species of this genus have been found in the North Pacific, 

 along the western coast of America, and again along the colder areas 

 off the coast of Japan. 



BATHYSIPHON FILIFORMIS G. O. Sars. 



Bathysiphon filiformis (M. Sars MS.) G. O. Sars, Forh. Vid. Selsk. Christiania, 

 1871 (1872), p. 251.— Norman, Rep. Brit. Ass., 1880, p. 389.— H. B. Brady, 

 Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 248, pi. 26, figs. 15-20.— Goes, 

 Kongl. Svensk. Vet. Akad. Handl., vol. 25, no. 9, 1894, p. 16, pi. 3, figs. 

 39-41.— de Folin, Act. Soc. Linn. Bordeaux, vol. 40, 1886, p. 279, pi. 6, figs. 

 4 a-e. — Chapman, Proc. Zool. Soc. London, 1895, p. 12. — Goes, Bull. Mus. 

 Comp Zool., vol. 29, 1896, p. 23, pi. 1, figs. 11, 12.— Rhumbler, Arch. 

 Protistk., vol. 3, 1903, p. 270, fig. 116 (in text). 



Description. — Test free, cylindrical, of nearly uniform diameter, 

 straight or somewhat curved, chamber tubular, of nearly uniform 

 diameter, the open ends serving as the apertures; wall composed of 

 felted sponge spicules and fine sand in varying proportions, rather 

 soft; color light gray or white, sometimes even black, but when 

 covered more or less by fine sand, taking on a brownish color. 



Length up to 50 mm. or more ; diameter up to 4 mm. 



Distribution. — Specimens of this species were found by Goes in the 

 Albatross material from the eastern tropical North Pacific at five 

 stations, D3375, D3407, D3418, D3419, and D3431, in depths 

 from 660-1,201 fathoms. I have examined Goes's material from 

 Station D3419 and have found broken specimens in material from 

 Station D3431. Later I obtained an abundance of fine long speci- 

 mens from material dredged by the Albatross off San Diego, station 

 D4337, 617-680 fathoms. These specimens were the best I have 

 ever seen. The Challenger obtained specimens from station 237, in 

 1,875 fathoms, east of Japan. 



Some of the specimens have a very considerable amount of arena- 

 ceous material built into the outer part of the Wall, giving a very 

 different appearance from that of typical specimens. These, how- 

 ever, are of the same size and shape and are associated in the material 

 from the same station. In his list in 1896, page 92, Goes used the 

 name, var. arenosus for this form with the sandy exterior, and his 

 material has still another name, although neither was used in his 

 original text. The constrictions of the wall are not prominent, as in 

 the material figured by Brady. 



Several fragmentary specimens were found at Albatross station D 

 5056, in 258 fathoms, in Suruga Gulf, Japan. These are somewhat 

 smaller than the other material referred to and have a considerable 

 range of variation in the character of the test. 



