10 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



mal in possessing a basal spine set at nearly right angles to the plane of 

 compression of the test. In general, this species is smoothly rounded 

 and shows neither peripheral angularity nor depression of sutures 

 although both these features are subject to variation. 



Genus ROSALINA d'Orbigny, 1826 



ROSALINA CONCINNA (Brady) 



Plate 4, Figure 3 



Discorbina concinna Brady, 1884, Rep. Voy. Challenger, Zoology, vol. 9, p. 646, 



pi. 90, figs. 7, 8. 

 Discorbis concinna (H. B. Brady). — Cushman, Todd, and Post, 1954, U.S. Geol. 



Surv. Prof. Paper 260-H, p. 358, pi. 89, figs. 12, 13.— Bandy, 1956, U.S. 



Geol. Surv. Prof. Paper 274-G, p. 193, pi. 31, fig. 4. 



Rosalind concinna appears to be a cosmopolitan species in warm, 

 shallow waters of the equatorial regions. Its best distinguishing 

 characteristics are its nearly circular outline and its concavo-convex 

 shape with rounded (not sharp) periphery. Three or four crescent- 

 shaped chambers comprise the final whorl but, if the dorsal suture 

 lines are obscured, it is not possible to determine by any peripheral 

 indentations where the dorsal sutures are located. The wall is thin, 

 translucent, and fairly coarsely and densely perforated on both dorsal 

 and ventral surfaces. The early whorl, usually orange, is easily 

 observed at the crest of the flat dome of the dorsal surface. In well- 

 preserved specimens the aperture near the center of the depressed 

 ventral surface can be seen to be protected by a projecting lip. In 

 a large proportion of the specimens, however, the ventral wall is 

 broken or partially dissolved away. 



ROSALINA FLORIDANA (Cushman) 



Plate 3, Figures 1, 3; Plate 4, Figure 5 



Discorbis floridana Cushman, 1922, Carnegie Instit. Washington, Publ. 311, 



p. 39, pi. 5, figs. 11, 12.— Cushman and Parker, 1931, Proc. U.S. Nat,. 



Mus., vol. 80, art. 3, p. 18, pi. 4, fig. 5.— Cushman, 1931, U.S. Nat. Mus. 



Bull. 104, pt. 8, p. 21, pi. 4, figs. 7, 8.— Parker, 1948, Bull. Mus. Comp. 



Zool., vol. 100, p. 238 (list), pi. 5, fig. 23.— Phleger and Parker, 1951, 



Geol. Soc. Amer. Mem. 46, pt. 2, p. 20, pi. 10, fig. 4. — Phleger, 1954, Bull. 



Amer. Assoc. Petr. Geol., vol. 38, no. 4, p. 638, pi. 1, figs. 30, 33, 34.— 



Drooger and Kaasschieter, 1958, Verh. Kon. Nederl. Akad. Wetensch., 



Aid. Natuurk., ser. 1, vol. 22, p. 42, pi. 2, fig. 6. 

 Rosalina floridana (Cushman).' — Parker, 1954, Bull. Mus. Comp. Zool., vol. Ill, 



no. 10, p. 524, pi. 8, figs. 19, 20. — Todd and Bronnimann, 1957, Cushman 



Found. Foram. Res. Spec. Publ. 3, p. 36, pi. 9, figs. 16-21. 

 Discorbis opima Cushman, 1933, Contr. Cushman Lab. Foram. Res., vol. 9, 



p. 88, pi. 9, fig. 3.— Cushman, Todd, and Post, 1954, U.S. Geol. Surv. 



Prof. Paper 260-H, p. 358, pi. 89, figs. 10, 11.— Todd, 1957, U.S. Geol. 



Surv. Prof. Paper 280-H, p. 290 (tbl. 4), pi. 90. fig. 11. 



