40 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



The Rosalina stage is rather high spired for this genus, and the 

 balloon chamber is rough surfaced and slightly crinkled. The sepa- 

 rate chambers of the Rosalina stage are small and numerous and 

 slightly bulging. The wall is orange brown in the initial chambers and 

 more finely perforate than that of T. 'planus. 



TRETOMPHALUS PLANUS Cushman 



Plate 18, Figure 1 



Tretomphalus bulloides (cTOrbigny) var. plana Cushman, 1924, Carnegie Instit. 



Washington, Publ. 342, p. 36, pi. 10, fig. 8. 

 Tretomphalus planus Cushman, 1934, Contr. Cushman Lab. Foram. Res., vol. 



10, pt. 4, p. 94, pi. 11, fig. 11; pi. 12, figs. 18-22. 



This species was described from Samoa and is apparently to be 

 expected in shallow water around various Pacific islands. It is char- 

 acterized by its usually broad and flattened balloon chamber and by 

 the low flat cone of the Rosalina stage with its more coarsely perforate 

 wall. In addition, the chambers of the Rosalina stage are small and 

 inclined to be individually bulging so that from the dorsal side the 

 specimens resemble Cymbaloporetta more than Rosalina. 



Family CASSIDULINIDAE 



Genus CASSIDULINA d'Orbigny, 1826 



CASSIDULINA ANGULOSA Cushman 



Plate 17, Figure 2 



Cassidulina angulosa Cushman, 1933, Contr. Cushman Lab. Foram. Res., vol. 

 9, pt. 4, p. 93, pi. 10, fig. 6.— Cushman, Todd, and Post, 1954, U.S. Geol. 

 Surv. Prof. Paper 260-H, p. 365, pi. 90, fig. 22. 



This compressed species with elongate chambers and a lobulated, 

 almost serrate, periphery was described from a deep-water sample 

 off the Marshall Islands and has been recorded only from the area of 

 the Marshalls. Specimens have never been found to occur commonly 

 and are restricted to deep water. 



CASSIDULINA CARINATA Silvestrl 



Plate 17, Figure 4 



Cassidulina laevigata d'Orbigny var. carinala A. Silvestri, 1896, Accad. Pont. 



Nuovi Lincei, Mem. 12, p. 104, pi. 2, fig. 10 (C. laevigata in explanation of 



plate) . 

 Cassidulina carinata A. Silvestri. — Phleger, Parker, and Peirson, 1953, 



Rep. Swedish Deep-Sea Exped., vol. 7, Sediment Cores, no. 1, p. 44, pi. 9, 



figs. 32, 37.— Parker, 1954, Bull. Mus. Comp. Zool., vol. Ill, no. 10, p. 



535, pi. 10, fig. 30.— Parker, 1958, Rep. Swedish Deep-Sea Exped., vol. 8, 



Sediment Cores, no. 4, p. 271, pi. 4, fig. 15. 



