34 



BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



Fig 



23.— Rhizammina 



FOEMIS. X 10. 



Description. — Test free, consisting of a dichotomously branching 

 flexible tube, forming tangled masses of indefinite size; wall thin, 

 largely chitinous, but with various sorts of for- 

 eign matter attached to the exterior, either 

 sand or other foraminiferal tests according to 

 the character of the bottom, surface when free 

 from foreign matter roughened, color of the 

 chitinous tubes brown. 



Diameter 0.126-0.315 mm. 

 Distribution. — But four stations are known 

 in the North Pacific for this species. Three of 

 these are Challenger stations, 237, 244, 246, in 

 1,875, 2,900 and 2,050 fathoms, respectively; 

 two in the middle of the North Pacific, the 

 shallowest one east of Japan. Goes found the 

 species at Albatross station D3415, off the 

 coast of Mexico, in 1,879 fathoms. This ma- 

 terial of Goes which I have examined is typ- 

 ical, without any appreciable amount of foreign 

 material adherent to the tubes. 



As the experiments of Brady show, the test 

 is very largely made up of chitinous material with a small amount of 

 silica in the wall. 



RHIZAMMINA INDIVISA H. B. Brady. 



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



277, pi. 29, figs. 5-7.— Egger, Abh. kon. 



bay. Akad. Wiss. Miinchen, vol. 18, 1893, 



p. 256, pi. 4, fig. 17.— Chapman, Proc. 



Zool. Soc. London, 1895, p. 14.— Goes, 



Bull. Mus. Comp. Zool. vol. 29, 1896, p. 



20.— Flint, Rep. U. S. Nat. Mus., 1897 



(1899), p. 272, pi. 15, fig. 2.— Rhumbler, 



Arch. Protistk., vol. 3, 1903, p. 252, fig. 



91 (in text). 

 Marsipella indivisa EiMER,and Fickeet, 



Zeitschr. wiss. Zool., vol. 65, 1899, p. 



668. 



Description. — Test free, cylindrical, 

 flexible, often tapering toward the ends, 

 which are open and serve as apertures, 

 wall composed largely of chitinous ma- 

 terial but with a variable amount of 

 sand or foraminiferal tests attached to 

 the exterior FlG- 24.— khizammina indivisa. 



Length up to 10 mm.; diameter 0.25-0.40 mm. 



