44 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



Cassidulina calabra Seguenza, sp.- — Brady, 1884, Rep. Voy. Challenger, Zoology, 

 vol. 9, p. 431, pi. 113, fig. 8. 



In this globular species the nearly spherical shape is interrupted 

 only by the low, broad, and depressed apertural face. The aperture 

 is curved typically so that its outermost part is approximately parallel 

 with the periphery of the test, rather than at an angle to it as in Cas- 

 sidulina subglobosa. The test is composed of about five pairs of cham- 

 bers per whorl with the greatest breadth of the test across the final 

 pair of chambers. The sutures are nearly horizontal on the dorsal 

 surface and not very sloping as in C. subglobosa. The sutures are 

 virtually indistinguishable except when the test is moistened. 



Cassidulina pacifica occurs rarely in scattered deep-water samples 

 in the present collections. 



CASSIDULINA PATULA Cushman 



Plate 17, Figure 5 



Cassidulina patula Cushman, 1933, Contr. Cushman Lab. Foram. Res., vol. 9, 

 pt. 4, p. 92, pi. 10, fig. 2. 



This species, described from 486 fathoms off Pinaki Atoll in the 

 Paumotu Islands, is well represented in the present collections. 

 Its distinguishing features are its elongate but rather widely open 

 aperture and the few chambers of which its test is composed. Its 

 wall is smooth and polished but shows distinct and widely spaced 

 perforations, giving a characteristic speckled appearance to the 

 surface. 



Because of the few chambers in Cassidulina patula, the ventral 

 surface is bisected by a vertical suture that meets the aperture at 

 about its midpoint. The dorsal surface is bisected by a horizontal 

 suture dividing that surface approximately in half, the top half 

 constituting the last-formed chamber. By these features, as well as 

 by the more widely open aperture, specimens of C. patula are separated 

 easily from the thicker specimens of C. delicata, which they otherwise 

 resemble. 



CASSIDULINA cf. C. SPINIFERA Cushman and Jarvls 



Cassidulina cf. C. spinifera Cushman and Jarvis.- — Cushman, Todd, and Post, 

 1954, U.S. Geol. Surv. Prof. Paper 260-H, p. 366, pi. 90, fig. 34. 



Another single specimen, identical with the one from deep water 

 off Bikini, was found at Albatross station H3997 off Arhno atoll in 

 the southeastern Marshalls, at a depth of 1,253 fathoms. These 

 specimens may prove to be modern descendants of the spinose 

 Oligocene species Cassidulina spinifera, thus far reported only from 

 the West Indies. 



