TROPICAL PACIFIC FORAMINIFERA OF "ALBATROSS" 61 



Globigerina subcretacea Chapman, 1902, Journ. Linnean Soc, Zoology, vol. 28, 

 p. 404 (list) ; p. 410, pi. 36, fig. 16. 



This cosmopolitan species occurs at numerous stations but is never 

 very common. Its chief distinguishing feature is its cancellated wall. 

 The number of chambers per final whorl varies between 5 and 7. The 

 inner coil of earlier chambers is low and inconspicuous. The 

 whole test presents a robust and compact appearance. The um- 

 bilicus is open and deep with the aperture opening into it but obscured 

 by the edge of the final chamber extending over it. The final chamber 

 is characteristically smaller than the others in the adult whorl and 

 somewhat projecting downward and inward over the umbilicus. As 

 adults there is not much likelihood of confusion between this species 

 and others that occur with it. 



GLOBIGERINA HEXAGONA Natland 



Globigerina hezagona Natland, 1938, Scripps Instit. Oceanography Bull., Tech. 

 Ser., vol. 4, no. 5, p. 149, pi. 7, fig. 1. — Phleger, Parker, and Peirson, 

 1953, Rep. Swedish Deep-Sea Exped., vol. 7, Sediment Cores, no. 1, p. 12, 

 pi. 1, figs. 13, 14. — Bradshaw, 1959, Contr. Cushman Found. Foram. Res., 

 vol. 10, p. 36, pi. 6, figs. 11-15. 



This species, originally described from deep water off southern 

 California, has been reported also from deep-sea cores in the North 

 Atlantic and from plankton tows in the Pacific. It is known also 

 as a fossil under the names of Globorotaloides suteri Bolli and possibly 

 G. variabilis Bolli (1957a, p. 117, pi. 27;'figs. 9-20; 1957b, p. 166, 

 pi. 37, figs. 10-12), probably extending back as far as the Eocene. 

 It seems never to occur more than rarely. 



In the present material, rare specimens were found in eight of the 

 samples. Their distinguishing characteristics are the flat dorsal 

 surface, strongly lobulated periphery, and the coarsely cancellated 

 wall. 



GLOBIGERINA RUBESCENS Hofker 



Globigerina rubescens Hofker, 1956, Skrift. Univ. Zool. Mus., K0benhavn, vol. 

 15, p. 234, pi. 35, figs. 18-21. 



This minute species undoubtedly is represented more abundantly 

 and widely in the southeastern Pacific than the few present records 

 would indicate. Because of its small size (maximum diameter about 

 0.25 mm), it is overlooked frequently or even lost during the prepara- 

 tion process. 



Globigerina rubescens was described from the eastern part of the 

 Malayan Archipelago. It is distinguished by its simple structure 

 with high-arched and proportionally large aperture. It is typically 

 but not invariably pink. 



