20 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



ASTRORHIZA ANGULOSA H. B. Brady. 



Astrorhiza angulosa H. B. Brady, Quart. Journ. Micr. Sci., vol. 21, 1881, p. 48; 

 Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 234, pi. 20, figs. 10-13.— Goes, 

 Bull. Mub. Comp. Zool., vol. 29, 1896, p. 19.— Flint, Rep. U. S. Nat. Mue., 

 1897 (1899), p. 205, pi. 3, fig. 1.— Rhumbler, Arch. Protistk., vol. 3, 1903, p. 

 218, fig. 38 (in text). 



Description. — Test depressed, subtriangular (rarely quadrangular), 

 biconvex, rounded at the edges, interior consisting of a small central 

 chamber from which tubes radiate, one to each angle of the test, their 

 open ends serving as apertures; wall thickest about the central 



chamber, composed of fine sand, exterior 

 of the test loose and granular, within, 

 smoothly finished, wall about the aper- 

 tures often tinged a reddish-brown. 

 Diameter, 2-4 mm. 



Distribution, — This species was ob- 

 tained by the Albatross at a single station, 

 D3407, off James Island, Galapagos, in 

 885 fathoms from globigerina ooze. 



Of the four specimens from this station 

 in Goes' material, two have the darker- 

 colored neck as shown in Brady's figures 

 (pi. 20, figs. 11, 12). 



Fig. 1.— Astrorhiza angulosa. x 15. 



ASTRORHIZA FURCATA Goes. 



Astrorhiza furcata Goes, Bull. Mus. Comp. Zool., vol. 29, 1896, p. 19, pi. 1, figs. 

 4, 5.— Rhumbler, Arch. Protistk., vol. 3, 1903, p. 218, fig. 39 (in text). 



Description. — Test flattened below, convex above, triangular, with 

 three tapering arms, attenuated at their ends, which serve as aper- 

 tures; angles between the arms unequal, the arm opposite the smallest 

 angle usually longer than either of the other two; wall of medium 

 thickness, composed of mud and fine sand with occasional larger 

 fragments; texture of wall fairly firm, more so than in most of the 

 other species of the genus, color dark gray or almost black. 



Length about 5 mm. 



Distribution. — Obtained by the Albatross at a single station, D3419 

 off Acapulco, on the west coast of Mexico, in 772 fathoms in green 

 mud. This is the type station. 



The three specimens selected by Goes from the original station are 

 figured here. They show the variation in form as well as other slight 

 differences. One or two other specimens were also found in looking 

 through the material from this station. The species is different in 

 various ways from typical Astrorhiza but may be left here until more 

 material can be obtained. 



