FORAMINIFERA OF NORTH PACIFIC OCEAN. 



33 



comparatively thick, composed of sponge spicules and a very hard 

 siliceous cement, color reddish or yellowish brown. 



Length up to 12 mm.; diameter about 0.5 mm. 

 in the broadest part. 



Distribution. — Goes records this species from three 

 Albatross stations, D3375,D3376, in 1,201 and 1,132 

 fathoms, respectively, south of Panama, near the 

 equator; the other, D3419, in 772 fathoms, off 

 Acapulco, on the Mexican coast. I have seen 

 material from station D3376, consisting of eight 

 specimens selected by Goes, and one of which is here 

 figured. Specimens were also seen from station D 

 3407, just south of the equator, in this same region, 

 in 885 fathoms. A single specimen was found in 

 material from Alert station 1156, 2,046 fathoms, 

 south of the Bonin Islands. 



The specimens are much more constricted than 

 those figured by de Folin, and none of them has the 

 very small aperture or the finish shown in the larger 

 end of the original specimens figured. 



Genus RHIZAMMINA H. B. Brady, 1879. 



RhizamminaH. B. Brady (type, R.algxformisJl. B. Brady), 

 Quart. Journ. Micr. Sci., vol. 19, 1879, p. 39. — Butschli 

 in Bronns Klassen und Ordnungen des Thierreichs, vol. 

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

 Zoology, vol. 9, 1884, p. 274. — Rhumbler, Arch. 

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



Marsipella (part) Eimer and Fickert, Zeitschr. wiss. Zool., 

 vol.65, 1899, p. G68. 



Description. — Test free, consisting of a simple or 

 dichotomously branching flexible tube, wall largely 

 chitinous, bearing various foreign bodies attached 

 to the exterior. 



But two species of this genus are known, both 

 occurring rarely in the North Pacific. The flexible 

 character of the wall is a distinctive feature. 



RHIZAMMINA ALG-ffiFORMIS H. B. Brady. 



a 



Fig. 22.— Bathysiphon 

 rufus. X 20. a, SIDE 

 view; b, END VIEW. 



Rhizammina algseformis H. B. Brady, Quart. Journ. Micr. 

 Sci., vol. 19, 1S79, p. 39, pi. 4, figs. 16, 17; Rep. Voy. 

 Challenger, Zoology, vol. 9, 1884, p. 274, pi. 28, figs. 

 1-11.— Goes, Bull. Mus. Comp. Zool., vol. 29, 1896, 

 p. 20.— Flint, Rep. U. S. Nat. Mus., 1897 (1899), p. 272, pi. 15, fig. 1 

 Rhumbler, Arch. Protistk., vol. 3, 1903, p. 252, fig. 92 (in text). 



16777— Bull. 71—10 3 



