NO. 4 PLANKTONIC FORAMINIFERA — CIFELLI I3 



tend to wrap around the umbilicus, rather than overlap it as they do 

 in Pnlleniatina obliquilocnlata. 



In view of the close morphologic aflinities of G. dutertrei to G. 

 pachyderma incompta and Pnlleniatina obliqnilocidata, I disagree with 

 Parker (1962, pp. 221, 242) in removing G. dutertrei from the genus 

 Glohigerina and placing it in the genus Glohoquadrina, family 

 Globorotaliidae. At least, I can find no consistent difference in wall 

 surface between G. dutertrei and other species of Glohigerina. Nor 

 can a separation be made by the presence or absence of spines, since, 

 as Parker points out (Parker, 1962, p. 224), Glohigerina pachyderma 

 only sometimes has spines. The fact that spines may be present or 

 absent in a single species weakens considerably the argument that 

 spines are a character of sufficient importance to separate otherwise 

 similar species into different families. 



Distrihution. — Glohigerina dutertrei appears to be relatively rare 

 among the Glohigerina in the northwestern part of the Atlantic. In 

 the summer, the maximum frequency was 5 percent (station HH') 

 and in the fall, 9 percent (station 6). It was not recorded in the 

 winter, and in the spring the maximum frequency was only 2 percent 

 (station 3). 



GLOBIGERINA aff. G. QUINQUELOBA Natland 

 Plate 2, figures 3, 4 



Glohigerina of. quinqueloba Todd and Bronniman, 1957, Cushman Found. 



Foram. Res. Spec. Publ. No. 3, p. 40, pi. 12, fig. 2. 

 Glohigerina aff. quinqueloba Be, 1959, Micropaleontol., vol. 5, No. 1, pi. 1, figs. 



21, 22. 



The test is small, and there are 4 to 6 chambers visible on the 

 ventral side. The periphery is lobulate, and the final chamber deviates 

 slightly from the trochoid spiral, projecting over the umbilicus. The 

 wall is thin and translucent. The aperture is a rounded umbilical 

 opening that is sometimes partially obscured by a thin, weakly de- 

 veloped chamber. The coiling is both sinistral and dextral, but the 

 sinistral mode is dominant. 



The specimens included here and those in the figures cited closely 

 resemble G. quinqueloha but differ in having a thinner wall and a less 

 developed lip. 



The present specimens also resemble in general form and outline 

 Glohigerina concinna Reuss and G. diplostoma Reuss (which appears 

 to be identical with G. concinna) as originally figured. Those figures, 

 however, are lacking in diagnostic detail, and G. concinna and G. 



