FOEAMINIFERA OF NORTH PACIFIC OCEAN. 



23 



ASTRORHIZA TENUIS Goes. 



Astrorhiza tenuis Goes, Bull. Mus. Comp. Zool., vol. 29, 1896, p. 20, pi. 1, figa. 

 6-8.— Rhumbler, Arch. Protistk., vol. 3, 1903, p. 220, fig. 43 (in text). 



Description. — ''More or less slender cylindrical or fusiformed tubes, 

 usually tapering to the ends, with constricted apertures. Tube 

 channel smooth, with faint traces of spurious septa. Wall loosely 

 cemented of coarse sand, light grayish, comparatively thick." 



"Length 5-10 mm.; diameter 1-1.5 mm." 



Distribution. — Described by Goes from Albatross station D3431, 

 995 fathoms, at the entrance to the Gulf of California. 



In the collection at Washington there are no specimens of this 

 species in the material returned by Doctor Goes. No specimens 

 which can be definitely assigned to this species were found in an 

 examination of the unsorted material from this station. The de- 



Figs. 7.— Astrorhiza tenuis, a, longitudinal section; b, transverse section; 



C, SIDE VIEW OF EXTERIOR. (AFTER GofiS.) X 0. 



scription and figures are given from Goes' s original paper. It seems 

 to me questionable whether this is a true Astrorhiza, but without 

 specimens it is difficult to decide. 



Genus RHABDAMMINA Carpenter, 1869. 



Rhabdammina M. Sars, Forh. Vid. Selsk. Christiania, 1868, p. 2iS(nomen nudum). — 



W. B. Carpenter (type, A', abyssorum W. B. Carpenter), Ann. Mag. Nat. 



Hist., ser. 4, vol.4, 1869, p. 288; Proc. Roy. Soc. London, vol. 18, 1869, p. 



60.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 266. 

 Astrorhiza (part) -\- Rhizammina (part) Eimer and Fickert, Zeitschr. wiss. Zool., 



vol. 65, 1899, p. 666. 



Description. — Test free, tubular, either straight, radiating from a 

 common center or branching, open ends of the tube serving as aper- 

 tures; wall coarsely arenaceous, usually more or less rough, firmly 

 cemented. 



