14 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



Cibicides is), thus allowing expansion in size only on the opposite 

 (ventral) surface. But not all specimens are inflated ventrally and, 

 moreover, it seems most unlikely that an open umbilicus would be 

 present on the exposed surface of any test. 



This species, found at only a few of the nearshore and shallower 

 stations, was fairly common in several of the samples. 



Genus DISCORBIS Lamarck, 1804 



DISCORBIS SUBVESICULARIS Collins 



Discorbis subvesicularis Collins, 1958, Brit. Mus. (Nat. Hist.), Great Barrier 

 Reef Exped. 1928-29, Sci. Rep., vol. 6, no. 6, Foraminifera, p. 401, pi. 5, 

 fig. 5. 



A single specimen from Port Lottin, Kusaie, Caroline Islands, 

 seems identical with this species described from a channel into a 

 mangrove swamp on the Great Barrier Reef. Except for the umbili- 

 cal flaps and consequent complication of the apertural openings, this 

 species would be regarded as a simple Rosalina. 



DISCORBIS? AGUAYOI Bermudez 



Discorbis aguayoi Bermudez, 1935, Mem. Soc. Cubana Hist. Nat., vol. 9, p. 204, 

 pi. 15, figs. 10-14. — Boltovskoy, 1959, Argentina Serv. Hidro. Naval, 

 Publ. H1005, p. 90, pi. 12, fig. 22. 



Discorbis? aguayoi Bermudez. — Todd and Bronnimann, 1957, Cushman Found. 

 Foram. Res. Spec. Publ. 3, p. 37, pi. 9, fig. 24. 



Discorinopsis aguayoi (Bermudez). — Phleger, Parker, and Peirson, 1953, 

 Cushman Found. Foram. Res. Spec. Publ. 2, p. 7, pi. 4, figs. 23, 24. — Arnold, 

 1954, Contr. Cushman Found. Foram. Res., vol. 5, pp. 4-12, pis. 1, 2. 



Rare specimens were found in three of the atoll samples. This 

 species was described from off Cuba and has been reported from off 

 southern Brazil, the Gulf of Paria, and the coast of Texas. It is 

 apparently characteristic of nearshore and brackish environments. 



A similar, if not identical, species has been described as Discorinop- 

 sis tropica (Collins, 1958, p. 406, pi. 5, fig. 7) from a mangrove swamp 

 on the Great Barrier Reef. 



Genus SVRATK1NA Pokorny, 1956 



SVRATKINA AUSTRALIENSIS (Chapman, Parr, and Collins) 



Discorbis tuberculala (Balkwill and Wright) var. australiensis Chapman, 



Parr, and Collins, 1934, Journ. Linn. Soc, Zool., vol. 38 (no. 262), p. 



563, pi. 8, fig. 9. 

 Svratkina aff. axistraliensis Chapman, Parr and Collins. — Pokorny, 1956, Univ. 



Carolina [Prague], Geol., vol. 2, no. 3, p. 259, text figs. 1-3. 

 Epislominella sp. D. Todd, 1957, U.S. Geol. Surv. Prof. Paper 280-H, tbl. 



4, pi. 92, fig. 2. 

 Svratkina sp. A. Todd and Low, 1960, U.S. Geol. Surv. Prof. Paper 260-X, p. 



840. 



