l8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I48 



observed to be double layered, with the layers loosely attached like 

 the concentric rings of an onion. On these specimens the outer layer 

 could easily be separated from the inner one with a dissecting needle. 



The bichambered form, Biorbulina hilohata of some authors, is 

 regarded here as a variant form of Orbulina imiversa. It is very 

 rare and vi^as observed at only one station (Sargasso Sea, summer 

 station KK). 



Distribution. — This species occurs mostly in the Sargasso Sea and 

 Gulf Stream in low to moderately high frequencies. The lowest fre- 

 quencies were recorded in the winter, with less than 2 percent at all 

 stations. The summer traverse yielded the highest frequencies, reach- 

 ing 18 percent at station KK. 



Genus GLOBOROTALIA Cushman, 1927 

 GLOBOROTALIA PUNCTULATA (d'Orbigny) 



Plate 4, figure 4 ; plate 5, figure 1 



Globigerina punctulata d'Orbigny, 1826, Ann. Sci. Nat., vol. 7, p. 277, No. 8. — 



FoRNASiNi, 1898, Paleontol., Ital., vol. 4, p. 210, text fig. 5. 

 Globorotalia punctulata Phleger, Parker and Peirson, 1953, Rep. Swedish 



Deep-Sea Exped., vol. 7, No. 1, p. 20, pi. 4, figs. 8-12.— Be, 1959, Micro- 



paleontol., vol. 5, No. 1, pi. 1, figs. 9-12. 

 Globorotalia crassajormis (Galloway and Wissler, 1927). Parker, 1962, Micro- 



paleontol, vol. 8, No. 2, p. 35, pi. 4, figs. 17-18, 20-21. 



The test of this species is characterized by its flattened dorsal side 

 and its relatively high spire. The periphery is angular and, occasion- 

 ally, thinly keeled. The aperture is slitlike and extends from the 

 umbilicus to the vicinity of the periphery. On some specimens there 

 is a thin lip above the aperture. 



The close morphologic affinities between Globorotalia punctulata 

 and Globigerina inflata were mentioned under the latter. It is pos- 

 sible that somewhere in their geographic and stratigraphic ranges 

 these forms intergrade, and they may eventually prove to be con- 

 specific subspecies. 



There has been considerable confusion concerning the rightful name 

 of this species, but no attempt is made here to resolve this complicated 

 legal problem which has been dealt with by Parker (1958, p. 281 ; 

 1962, p. 235) and Banner and Blow (1960, p. 15). Suffice it to say 

 that the present specimens are identical with G. punctulata as figured 

 by Fornasini. However, they are not identical with the single lecto- 

 type for both G. puncticulata and G. punctulata designated by Banner 

 and Blow. That lectotype clearly is not the same specimen figured by 



