400 BUT.T.F.TIISr 100, UNITED STATES NATIONAL MUSEUM. 



Spiroloeiilina tenuimargo — Material examined. 



SPIROLOCULINA TENUISSIMA Reuss. 



Plate 84, fig. 2. 



Spiroloculina tenuismna Reuss, Sitz. Akad. Wiss. Wien, vol. 55, 1867, p. 71, pi. 1, 

 fig. 11.— CusHMAN, Bull. 71, U. S. Nat. Mua., pt. 6, 1917, p. 32. 



Spiroloculina tenuis H. B. Brady (not Czjzek), Rep. Voy. Challenger, Zoology, 

 vol. 9, 1884, p. 152, pi. 10, figs. 9, 10 (not 7, 8, 11).— Hekon-Allen and Earland, 

 Trans. Zool. Soc. London, vol. 20, 1915, p. 556. — Sidebottom, Journ. Roy. 

 Micr. Soc, 1918, p. 5. 



Description. — Test very thin, translucent, elongate, compressed, in 

 front view tapering toward either end; chambers long and narrow, 

 peripheral margin broadly rounded, chambers in transverse section, 

 circular; apertural end produced into an elongate neck, aperture 

 rounded, usually without distinct teeth; wall smooth. 



Length usually less than 0.5 mm. 



The records for this species are mostly from water of several hun- 

 dred fathoms, and the four Philippine stations range from 295 to 554 

 fathoms (540 to 1,012 meters). The localities are off Balayan Bay, 

 Tanon Strait; east coast of Negros; Sogod Bay, southern Leyte; 

 and east of Mindoro. 



Sidebottom definitely refers one of his two varieties to the Chal- 

 lenger Report (pi. 10, fig. 9), which would make it this species. 

 His material was from 465 fathoms. (850 meters), off the east coast 

 of Austraha. Chapman records it off Funafuti, in deep water, 



Spiroloculina tenuissima — Material examined. 



SPIROLOCULINA MILLETTI WIesner. 



Plate 81, figs. 6, 7. 



Spiroloculina nitida H. B. Brady (not S. nitida d'Orbigny), Rep. Voy. Challenger, 

 Zoology, vol. 9, 1884, p. 149, pi. 9, figs. 9, 10.— Millett, Journ. Roy. Micr. Soc, 

 1898, p. 265, pi. 5, figs. 9-12.— Flint, Rep. U. S. Nat. Mus., 1897 (1899), p. 296, 

 pi. 41, fig. 4.— Bagg, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 119. 



Spiroloculina milletti Wiesner, Archiv. Prot., vol. 25, 1912, p. 207.— Cushman, 

 Bull. 71, U. S. Nat. Mus., pt. 6, 1917, p. 33, pi. 5, fig. 4. 



