54 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



Only rare specimens from four deep-water samples were found. The 

 species appears to be distinguished by the limb ate sutures on the 

 flat (dorsal, attached) side as well as by the conical shape of the 

 opposite (ventral) side. Punctation of the wall is coarse and con- 

 spicuous on the flat (dorsal) side and finer and inconspicuous on the 

 conical (ventral) side. 



CIBICIDES ROBERTSONIANUS (Brady) 



Plate 22, Figure 4 



Truncatulina robertsoniana Brady, 1884, Rep. Voy. Challenger, Zoology, vol. 



9, p. 664, pi. 95, fig. 4. 

 Cibicides robertsoniana (H. B. Brady). — Cushman, 1931, U.S. Nat. Mus. Bull. 



104, pt. 8, p. 121, pi. 23, fig. 6. — Phleger and Parker, 1951, Geol. Soc. 



Amer. Mem. 46, pt. 2, p. 31, pi. 16, figs. 10-13. 



Rare specimens of this species were found in a very few samples. 

 The test is about equally biconvex and bluntly angled on the periphery. 

 There are about 10 or more noninflated chambers per adult whorl; 

 hence, the periphery is not indented. The sutures are distinctly 

 limbate and strongly curved backward. The wall is coarsely punctate 

 on the dorsal side but has only scattered coarse pores on the ventral 

 side. 



Genus CIBICIDELLA Cushman, 1927 



CIBICIDELLA VARIABILIS (d'Orbigny) 



Truncatulina variabilis d'Orbigny. — Sidebottom, 1909, Mem. Proc. Manchester, 

 Lit. Philos. Soc, vol. 53, no. 21, p. 2, pi. 1, figs. 5, 6; pi. 2, figs. 1-3.— Heron- 

 Allen and Earland, 1922, Bull. Soc. Sci. Hist. Nat. Corse, p. 137, pi. 1, 

 figs. 38, 39. 



Cibicidella variabilis (d'Orbigny). — Colom, 1935, Bull. Instit. Catalana Hist. 

 Nat., vol. 35, p. 8, pi. 7, fig. 3; text figs. 6, 7. — Cushman, Todd, and Post, 

 1954, U.S. Geol. Surv. Prof. Paper 260-H, p. 372, pi. 82, fig. 13.— Graham 

 and Militante, 1959, Stanford Univ. Publ., Geol. Sci., vol. 6, no. 2, p. 116, 

 pi. 19, fig. 10. 



This form of Cibicides, having one of several irregularly shaped or 

 irregularly placed chambers, is referred to traditionally as Cibicidella 

 variabilis and is found usually in moderately shallow water. Rare 

 specimens occur in the present material, mostly from around the 

 islands. 



Family PLANORBULINIDAE 



Genus PLANORBULINA d'Orbigny, 1826 



PLANORBULINA ACERVALIS Brady 



Plate 22, Figure 2 



Planorbulina acervalis Brady, 1884, Rep. Voy. Challenger, Zoology, vol. 9, p. 

 657, pi. 92, fig. 4.— Cushman, Todd, and Post, 1954, U.S. Geol. Surv. 

 Prof. Paper 260-H, p. 372, pi. 82, fig. 14; pi. 91, figs. 34-36. 



