58 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



Geminospira bradyi Bermudez, 1952, Minist. Minas e Hidrocarburos Bol. Geol., 

 vol. 2, no. 4, p. 178, pi. 13, fig. 7. — Graham and Militante, 1959, Stanford 

 Univ. Publ., Geol. Sci., vol. 6, no. 2, p. 90, pi. 13, fig. 16. 



Pseudobulimina sp. — Cushman, Todd, and Post, 1954, U.S. Geol. Surv. Prof. 

 Paper 260-H, p. 350, pi. 87, fig. 20. 



Three small (about 0.25 mm. in length) specimens were found at 

 Albatross station H3798, 687 fathoms, in the Marquesas Islands. 



The nomenclature of this form is complicated by several factors. 

 In the first place, it is not generally agreed but is a matter of opinion 

 and judgment that species described under the names of convoluta, 

 simaensis, and bradyi are all the same species. To me it seems likely 

 that they are. This opinion is based on the observed variability 

 among specimens from individual samples where the genus has been 

 found. 



In the second place, the assignment of this species to the little- 

 known and little-used genus Geminospira, instead of to Pseudo- 

 bulimina, is necessary in view of the fact that the type species of 

 Pseudobulimina (Bulimina chapmani Heron-Allen and Earland) and 

 Ceratobulimina (Rotalina contraria Reuss) seem to be generically 

 indistinguishable, and thus Pseudobulimina Earland, 1934, falls into 

 synonymy with Ceratobulimina Toula, 1915. Although probably 

 belonging in the family Ceratobuliminidae by virtue of its aragonitic 

 wall, Geminospira is clearly distinct from the genus Ceratobulimina, 

 which is a close-coiled form without supplementary chambers. 



Incidentally, another genus, Cerobertina Finlay, 1939, is involved 

 in this problem. Judged only on the basis of descriptions and illus- 

 trations, Cerobertina may be a prior synonym of Geminospira. If so, 

 the former would supercede the latter; however, until this can be 

 determined, it seems preferable to use the generic name Geminospira. 



This species apparently has a worldwide distribution. Records 

 represented by the above synonymy include areas off the British Isles, 

 the Red Sea, the Pliocene to Recent of Japan, Torres Straits, off the 

 Philippines, and in the Marshall Islands. 



PLANKTONIC FAMILIES 

 Family GLOBIGERINIDAE 



Genus GLOBIGERINA d'Orbigny, 1826 



GLOBIGERINA BULLOIDES d'Orbigny 



Plate 24, Figure 1 



Globigerina bulloides d'Orbigny, 1826, Ann. Sci. Nat., vol. 7, p. 277; 1826, Modeles' 

 nos. 17 (young) and 76 (adult). — Cushman, 1941, Contr. Cushman Lab* 

 Foram. Res., vol. 17, p. 38, pi. 10, figs. 1-13. — Bradshaw, 1959, Contr" 

 Cushman Found. Foram. Res., vol. 10, p. 33, pi. 6, figs. 1-4. 



