26 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



RHABDAMMINA IRREGULARIS W. B. Carpenter. 



Rhabdammina irregularis W. B. Carpenter, Proc. Roy. Soc. London, vol. 18 

 1869, p. 60.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p! 

 268, pi. 21, fig. 9.— Goes, Bull. Mus. Comp. Zool., vol. 29, 1896, p. 21 — 

 Rhumbler, Arch. Protistk., vol. 3, 1903, p. 263, fig. 106 (in text). 



Description.— Test made up of a dichotomously branching tubular 

 chamber, of nearly even diameter, wall of firmly cemented sand 



Figs. 11-12.— Two specimens of rhabdammina irregularis, x 6. 



grains, exterior rather rough, interior smoothly finished, ends of the 

 tubes serving as the apertures, color usually a yellowish- or reddish- 

 brown. 



