38 



BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



adhering to each other by their outer surfaces. Walls thin, finely 

 arenaceous in texture, with minute interstitial orifices. General 

 aperture wanting. Diameter of individual chambers about one- 

 twenty-fifth of an inch (1 mm.), of the entire colony, variable, some- 

 times one-sixth of an inch (4.5 mm.)." 



Distribution. — Brady records this species at one Challenger station, 

 244, in the middle of the North Pacific in 2,900 fathoms. In the 

 volume on "Summary of Results" this species is also given as occur- 



32 



Figs. 31-32.— Sorosph^ea confusa. x 15 (after Brady). 



ring at station 246, in 2,050 fathoms. This station is also in mid- 

 ocean. 



The species has not been noted in any of the Albatross or Nero 

 material I have examined from the North Pacific. The above descrip- 

 tion and figure 8 are from Brady. 



Genus SACCAMMINA Carpenter, 1869. 



Saccammina (M. Sars type, S. sphserica G. O. Sars, Forh. Vid. Selsk. Christiania, 

 1868 (1869), p. 248) [nomen nudum].— Carpenter, Ann Mag. Nat. Hist., ser. 

 4, vol. 4, 1869, p. 289. — Butschli, in Bronns Klassen und Ordnungen des 

 Thierreichs, vol. 1, 1880, p. 195. — H. B. Brady, Rep. Voy. Challenger, Zoology, 

 vol. 9, 1884, p. 252.— Rhumbler, Zeitschr. wiss. Zool., vol. 57, 1894, p. 462 — 

 Eimer and Fickert (part), Zeitschr. wiss. Zool., vol. 65, 1899, p. 671. — 

 Rhumbler, Arch. Protistk., vol. 3, 1903, p. 242. 



Description. — Test free, or sometimes attached, of one or several 

 spherical chambers with distinct apertures, usually one for each 

 chamber, wall composed of sand grains attached firmly to one another 

 by a yellowish or brownish cement. 



Two species of Saccammina occur in the North Pacific. The first 

 of these, S. sphserica, has been found at numerous stations in the 

 colder waters, but the other species, S. socialis, seems to be very rare. 



