NO. 4 PLANKTONIC FORAMINIFERA- — CIFELLI I7 



aperture, characters diagnostic of the genus Globigerinita, are poorly 

 developed in the studied assemblages of this species, and neither 

 character appeared on more than about 1 percent of the specimens. No 

 single specimen was observed that combined both bulla and dorsal 

 aperture. 



To me, the relationship of Globigerinita whh the Globigerinidae 

 seems clear enough, and I see no need in placing that genus in Incertae 

 Familiae (Parker, 1962, p. 244). The test of Globigerinita is distinctly 

 globigerine in form, and there is not a known character in its species 

 that is not found in the Globigerinidae. The bulla, or modified last 

 chamber, occurs in variants of both Globigerina and Globigerinoides 

 species, and the dorsal aperture is a diagnostic feature of Globig- 

 erinoides. Nor is the nonspinose, smooth, finely perforate wall hard 

 to come by in the Globigerinidae, as Pulleniutina obliquiloculala lacks 

 spines and, in its final stage, has a smooth wall, comparable to that of 

 Globigerinita glutinata. 



Distribution. — Globigerinita glutinata appears to be a euryopic 

 species. In the traverses studied, this species ranged from the shelf 

 waters to the Sargasso Sea in about equal abundances. Frequencies 

 were low to moderate, the highest being 16 percent at the winter shelf 

 station F. In the summer a maximum frequency of 12 percent was 

 recorded at both shelf station B and Sargasso Sea station M]\I. 



Genus ORBULINA d'Orbigny, 1839 



ORBULINA UNIVERSA d'Orbigny 



Plate 3, figures 6, 7 



Orbulina unhersa d'Orbigny, 1839, in De la Sagra, Hist. Phys. Pol. Nat. Cuba, 

 Foraminiferes, p. 3, pi. 1, fig. 1. — Bradshaw, 1959, Contr. Cushman Found. 

 Foram. Res., vol. 10, pt. 2, p. 49, pi. 8, figs. 17, 18.— Be, 1959, Micropaleon- 

 tol., vol. 5, No. 1, pi. 2, fig. 18. 



The test is highly porous, with the pores being of two sizes 

 evenly scattered throughout the surface. The wall of the inner 

 globigerine stage is highly fragile and was seldom found preserved 

 in the material studied. Mostly all that was visible of this early stage 

 was protoplasm roughly retaining the shape of the chambers and 

 some spiny remnants of the wall. The globigerine stage is highly 

 spinose, and the spines radiate out into the outer chamber, sometimes 

 penetrating through the wall. 



The wall of the outer chamber is variable in thickness and almost 

 always single layered. However, on a few specimens the wall was 



