TROPICAL PACIFIC FORAMINIFERA OF "ALBATROSS" 53 



Cibicides lobatulus Cushman, 1931, U.S. Nat. Mus. Bull. 104, pt. 8, p. 118, pi. 

 21, fig. 3.— Parker, 1952, Bull. Mus. Comp. Zool., vol. 106, no. 9, p. 422, 

 pi. 6, fig. 26; no. 10, p. 446, pi. 5, fig. 11. — Cushman, Todd, and Post, 1954, 

 U.S. Geol. Surv. Prof. Paper 260-H, p. 371, pi. 91, figs. 27, 28. 



Truncatulina lobata d'Orfigny (in Barker-Webb and Berthelot), 1839, Hist, 

 nat. des lies Canaries, tome 2, pt. 2, Foraminiferes, p. 134, pi. 2, figs. 22-24. 



This well-known species is found in many of the samples of the 

 present collections. It has a worldwide distribution and is found in 

 almost any kind of environment, except possibly brackish or ex- 

 tremely deep conditions. 



Morphologically it is simple, evolute on one side and involute on 

 the other, with the aperture on the periphery and extending over 

 onto the evolute side, resulting in incomplete closure of the flat 

 evolute (dorsal) surface. The wall is densely and rather coarsely 

 perforate, usually equally so on both dorsal and ventral sides although, 

 if punctation is unequal, it is the ventral side that lacks the coarse 

 pores. The species exhibits great variability in shape, some of it 

 dependent on attachment by the flat dorsal surface. Some specimens 

 appear not to have been attached. Some are thick, rounded on the 

 periphery, and have individually bulging chambers. Others are 

 much compressed with a sharp and serrate periphery, resembling 

 an attached, irregularly spreading scale. Degree of limbation of 

 sutures and of periphery is likewise a highly variable feature. 



CIBICIDES MAYORI (Cushman) 



Plate 22, Figure 7 



Truncatulina mayori Cushman, 1924, Carnegie Instit. Washington, Publ. 342, 



p. 39, pi. 12, figs. 3, 4. 

 Cibicides mayori (Cushman). — Cushman, Todd, and Post, 1954, U.S. Geol. 



Surv. Prof. Paper 260-H, p. 371, pi. 91, figs. 29, 30.— Todd, 1957, U.S. 



Geol. Surv. Prof. Paper 280-H, p. 292 (tbl. 4), pi. 92, fig. 10. 



Typical specimens of this flat attached species occur in a few of 

 the samples and are more common in the shallower ones. The 

 species seems to be related to Cibicides lobatulus but is distinguished 

 by its more compressed test, irregular periphery with a roughly 

 fimbriate keel, and the presence of openings into the dorsal (flattened) 

 surface, resulting from the open dorsal portions of previous apertures. 



CIBICIDES REFULGENS Montfort 



Cibicides refulgens Montfort, 1808, Conch. Syst., vol. 1, p. 123, fig. — Cushman, 

 1931, U.S. Nat. Mus. Bull. 104, pt. 8, p. 116, pi. 21, fig. 2.— Colom, 1952, 

 Bol. Instit. Espaiiol Oceanografia, no. 51, p. 38, pi. 4, figs. 27-31; pi. 7, 

 figs. 24, 25. 



Truncatulina refulgens Montfort, sp. — Brady, 1884, Rep. Voy. Challenger, 

 Zoology, vol. 9, p. 659, pi. 92, figs. 7-9. 



