FOEAMINIFERA OF THE ATLANTIC OCEAN. 



Reophax bacillaris — materinl examined. 



21 



REOPHAX MEMBRANACEUS H. B. Brady. 



Reophax meDihranficensli. B. Bu.vdy, Qua'-t. Journ. Micr. Sci., vol. 19, 18711, p. .53, 

 pi. 4, fig. 9; Rep. Voy. Challenger. Zoology, vol. 9, 1884, p. 297, pi. 32, fig?. 

 1-4.— -MiLLETT. JoaTi. Roy. Hirr. Soc. 1890. p. 255. pi. 4, fig. 14. — Cushman. 

 Bull. 71, U. S. Nat. Mus.. pt. 1, 1910, ]). TO, fig. 12G.--Pe.\rcey. Tran.s. Roy. 

 Soc. Edinburgh, vol. 49. 1914, p. lOOU. 



Description. — Test small, elongate, slender, slightly curYed or 

 straight, composed of several chambers, broadest near the central 

 portion and tapering toward the ends, sutures distinct; wall thin, 

 chitinous, with fine sand particles, often wi"inkled transversely; 

 aperture small, circular, at the end of the somewhat truncate neck; 

 color a yellowish or reddish brown. 



Length up to 1.4 mm. 



Distribution. — In the Atlantic Challenger material this species is 

 recorded from off Palma, Canary Islands, in 1,125 fathoms (2,057 

 meters), and east of Buenos Aires in 1,900 fathoms (3,475 meters). 

 It also occurs in deep water in the Pacific. Pearcey notes it from 

 the Antarctic in 1,775 fathoms (3,246 meters) as rare. 



Millett's material from the Malay Archipelago does not seem to 

 be identical with the species figured b}^ Brady and that which I 

 have seen from the Pacific. 



R. memhranaceus is evidently a species of deep cold water and is either 

 rare or overlooked on account of its small size. 



Neither Flint nor I have found it in the Albatross material from 

 the Atlantic coast, but this might be expected, for most of the 

 material is not really abj'ssal in its character, whereas most of the 

 records for this species are from such habitats. 



