NO. 4 PLANKTONIC FORAMINIFERA — CIFELLI I5 



the winter it was recorded in the Sargasso Sea as far south as station 

 00 with a frequency of 2 percent. 



GLOBIGERINA sp. 



Plate 2, figures 5, 6 



The test is small and relatively high trochospirally. In the last 

 whorl the final 1 or 2 chambers tend to bend over the umbilicus. In 

 some specimens the umbilicus is covered with a small bubblelike 

 chamber with a narrow aperture at the margin. The surface of the 

 test is spinose. 



In general form this species resembles Glohigerinita glutinata, but 

 the surface is spinose and the chambers are more inflated. 



Distribution. — This form was recorded in frequencies of less than 1 

 percent at summer stations HH", MM ; fall stations 4, 9; spring sta- 

 tion 2. 



Genus PULLENIATINA Cushman, 1927 



PULLENIATINA OBLIQUILOCULATA (Parker and Jones) 



Plate 3, figures 1, 3; text figure 2 



Pullenia sphaeroides (d'Orbigny) var. ohliquiloculata Parker and Jones, 1865, 

 Philos. Trans. Roy. Soc. London, vol. 155, pp. 365, 368, pi. 19, figs. 4a-b. 



Pulleniatina ohliquiloculata (Parker and Jones) Bradshaw, 1959, Contr. Cush- 

 man Found. Foram. Res., vol. 10, pt. 2, p. 49, pi. 8, figs. 19, 20.— Be, 1959, 

 Micropaleontol., vol. 5, No. 1, pi. 2, figs. 4-6. 



Pullenia sphaeroides (d'Orbigny) var. obliquiloculata Banner and Blow, 1960, 

 Contr. Cushman Found. Foram. Res., vol. 11, pt. 1, p. 25, pi. 7, figs. 4a-c. 



In this species the coiling changes during growth from trochospiral 

 to streptospiral (Bolli, Loeblich, and Tappan, 1957, p. 39). The 

 change in the axis of coiling becomes apparent at about the end of the 

 second whorl, and the last 2 or 3 chambers overlap the umbilical 

 area. Some of the stages in development are shown in figure 2. 

 Stages 1-4 comprise the majority of forms, and stages 5-7, which are 

 like the typical form, make up only about 20 percent of the present 

 total populations in this species. Stages 5-7 appear to represent varia- 

 tions in the degree of overlap of the final chamber over the umbilicus 

 rather than successive periods of development. In stage 7, the 

 umbilicus is completely covered and the aperture is an extra-umbilical, 

 crescent-shaped arch. The highly polished surface occurs only in the 

 final 1 or 2 chambers, in stages 6-7. In the earlier stages the surface 

 is hispid, but no spines were observed. 



