42 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



This species, described from deep water in the Paumotu Islands, is 

 the only one of this genus in the present collections that has surface 

 ornamentation. It is represented rather widely and more commonly 

 in the deep water surrounding the Bikini and Eniwetok Atolls in the 

 Marshall Islands. 



The ornamentation consists of short and irregular raised costae, 

 like ruffles, best developed over the peripheral parts of the test, 

 leaving the area around the aperture smooth. The typical shape of 

 the test is globular, but rare individuals, somewhat compressed with 

 angled periphery, may be recognized by their ruffled ornamentation 

 as belonging in the species. 



CASSIDULINA DELICATA Cushman 



Plate 17, Figures 6, 7 



Cassidulina delicata Cushman, 1927, Bull. Scripps Instit. Oceanography, Tech. 

 Ser., vol. 1, no. 10, p. 168, pi. 6, fig. 5. — Cushman and Moyer, 1930, Contr. 

 Cushman Lab. Foram. Res., vol. 6, pt. 3, p. 61, pi. 8, fig. 16. — Crouch, 

 1952, Bull. Amer. Assoc. Petr. Geol., vol. 36, no. 5, p. 838, pi. 6, fig. 7 — 

 Bandy, 1953, Journ. Paleont., vol. 27, no. 2, p. 182, pi. 25, fig. 4. — Cushman, 

 Todd, and Post, 1954, U.S. Geol. Surv. Prof. Paper 260-H, p. 365, pi. 90, 

 fig. 25.— Walton, 1955, Journ. Paleont., vol. 29, no. 6, p. 1004, pi. 103, 

 figs. 28, 29. — Uchio, 1960, Cushman Found. Foram. Res. Spec. Publ. 5, 

 p. 68, pi. 9, fig. 17. 



This species was described from deep water (428 fathoms) off 

 Panama. Its other records are mostly from off the west coast of 

 North America. In the central Pacific it has been reported from the 

 Marshall Islands, and it is widely represented in the present 

 collections. 



Cassidulina delicata is distinguished by its more or less compressed 

 test and by the elongate and narrowly open aperture that occupies 

 nearly the entire length of the suture separating the final two chambers 

 at the top of the test. There is no internal tooth. The periphery 

 usually is nearly smooth and entire but may be lobulated slightly 

 in the less compressed and larger individuals. From each side the 

 chambers from the opposite side show only as very small triangles. 

 From the ventral side the face of the final chamber, as it curves down 

 toward the aperture, is wrinkled transversely. 



CASSIDULINA GEMMA Todd 



Cassidulina gemma Todd, in Cushman, Todd, and Post, 1954, U.S. Geol. Surv. 

 Prof. Paper 260-H, p. 366, pi. 90, figs. 26, 27. 



This species, described from deep water (835 fathoms) off Bikini 

 in the Marshall Islands, is represented only rarely in the present 

 collections. It is a rather distinctive species in this genus, being 

 characterized by its bulging chambers and depressed limbate sutures, 



