TROPICAL PACIFIC FORAMINIFERA OF "ALBATROSS" 45 



CASSIDULINA SUBGLOBOSA Brady 



Plate 16, Figure 7 



Cassidulina subglobosa Brady, 1884, Rep. Voy. Challenger, Zoology, vol. 9, p. 430, 

 pi. 54, fig. 17.— Cushman, Todd, and Post, 1954, U.S. Geol. Surv. Prof. 

 Paper 260-H, p. 367, pi. 90, figs. 30-32.— Parker, 1954, Bull. Mus. Comp. 

 Zool., vol. Ill, no. 10, p. 536, pi. 11, figs. 4-9.— Norvang, 1958, Vidensk. 

 Medd. Dansk naturh. Foren., vol. 120, p. 36, pi. 8, figs. 18, 19. 



Cassidulina subglobosa appears to be a widely distributed species 

 in both the Pacific and Atlantic and is well represented in the present 

 collections. 



It is characteristically a smoothly rounded species without in- 

 dividually bulging chambers, although in some specimens the sutures 

 are rather deeply incised, particularly on the ventral side of the test. 



In well-preserved individuals the aperture can be seen to consist 

 of two parts : an elongate opening along the suture, and a more or less 

 straight bulimine slit set at right angles to it and extending directly 

 into the apertural face. In most specimens the slit extending into 

 the apertural face is all that can be observed of the aperture. 



Considerable variability is shown by the present specimens. The 

 test may vary from a nearly spherical form with indistinguishable su- 

 tures to a somewhat compressed and elongate form with incised sutures. 

 The wall may vary from thick and opaque to translucent with the 

 pores slightly visible. 



Cassidulina subglobosa differs from C. pacifica, the only other 

 nearly spherical species found in the present collections, in having 

 an apertural end that may be slightly protruding whereas C. pacifica 

 has a broad, low, almost overhanging apertural face. Also, in C. 

 pacifica the sutures are nearly parallel and more closely spaced as 

 they cross the dorsal area. 



CASSIDULINA SUBTUMIDA Cushman 



Plate 16, Figures 5, 6; Plate 17, Figure 1 



Cassidulina subtumida Cushman, 1933, Contr. Cushman Lab. Foram. Res., vol. 



9, pt. 4, p. 93, pi. 10, fig. 5. 

 Cassidulina rarilocula Cushman, 1933, Contr. Cushman Lab. Foram. Res., vol. 



9, pt. 4, p. 93, pi. 10, fig. 4. 



This species was described from the present collections, the type 

 being from Albatross station H3920 off the Paumotu Islands in 2,284 

 fathoms. It occurs rarely and was found in only a few of the samples. 

 It is distinguished by its indented periphery and the few chambers of 

 which the test is composed. The central part of the test is inflated 

 whereas the outer part is compressed, giving the impression of being 

 pinched together around the periphery; however, the periphery is not 

 keeled. The aperture is rather large and extends into the apertural 

 face, rather than along it as in Cassidulina delicata and C. angulosa. 



