28 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



dorsal surfaces, this genus is more closely related to the family 

 Rotaliidae than to the Anomalinidae. 



Parr (1945, p. 211) gave as his reason for suppressing Planulinoides 

 as a synonym of Discorbinella Cushman and Martin, 1935, his recogni- 

 tion in some specimens of the normal discorbine aperture in addition 

 to the peripheral one. Most specimens are thinner-walled on the 

 ventral than on the dorsal side, and small openings are found broken 

 through into the interior of the test from the ventral side. In well- 

 preserved specimens, however, I have been unable to confirm the 

 existence of the discorbine aperture under a flap on the ventral side 

 of this species. I am, therefore, reassigning this species to Parr's 

 genus, which was set up for it. 



Planulinoides biconcavus occurs rarely in scattered deep-water 

 samples. 



Genus BUENINGIA Finlay, 1939 



BUENINGIA CREEKI Finlay 



Plate 8, Figure 4 



Biiningia creeki Finlay, 1939, Trans. Roy. Soc. New Zealand, vol. 69, pt. 1, 



p. 123, pi. 14, figs. 82-84. 

 Cibicidina sp. Cushman, Todd, and Post, 1954, U.S. Geol. Surv. Prof. Paper 



260-H, p. 372, pi. 91, fig. 32. 



This species was described first from the lower Miocene of New 

 Zealand. A few specimens, recorded under the name of Cibicidina sp. 

 from some of the deep-water samples around Bikini, seem to be the 

 first record of it from the Recent. In the present collections it is very 

 rare, but it has been found in a number of the deeper water samples. 



The species is a beautiful and quite distinctive one, hemispherical in 

 shape. The flat (or slightly concave) dorsal side has an open umbilicus 

 at its center, and the aperture extends from the umbilicus out to the 

 periphery under a projecting flap. The chambers on the ventral side 

 are inflated strongly, each subsequent one more so than the preceding, 

 so that the final two chambers make up over half the test; five cham- 

 bers compose the final whorl. The sutures on the dorsal side are 

 limbate but consist only of depressed lines between the inflated cham- 

 bers on the ventral side. The wall is smooth, clear, and thick, per- 

 forated by distinct but fine pores that, because of the thickness of the 

 wall, show up as irregular lines on the wall surface, somewhat as they 

 do in the genus Sphaeroidinella. The periphery is marked by a dis- 

 tinct limbate keel, best developed around the earlier chambers and 

 becoming nonexistent around the final chamber. 



