TROPICAL PACIFIC FORAMINIFERA OF "ALBATROSS" 39 



Two typical specimens were found in 21 fathoms, Guam Anchorage, 

 Ladrone [Marianas] Islands. 



This genus appears to be very close to Pyropilus Cushman, as was 

 pointed out at the time of erection of Pyropilus, which is distinguished 

 by its later growth being outward in only one direction, resulting in 

 an oblong test with the initial chambers nearer one end. Cymbalo- 

 porella likewise has an oblong outline but the initial chambers are 

 located centrally and obscured usually by a thickened or bubbly coat- 

 ing over the dorsal surface. 



Genus TRETOMPHALUS Moebius, 1880 



TRETOMPHALUS CONCINNUS (Brady) 



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



pi. 90, figs. 7, 8. 

 Tretomphalus concinnus (Brady). — Cushman, 1934, Contr. Cushman Lab. 



Foram. Res., vol. 10, pt. 4, p. 96, pi. 11, figs. 8, 9; pi. 12, figs. 13-15. — Parr, 



1945, Proc. Roy. Soc. Victoria, vol. 56 (new ser.), pt. 2, p. 212, pi. 11, figs. 



4, 5.— Todd, 1957, U.S. Geol. Surv. Prof. Paper 280-H, p. 292 (tbl. 4), pi. 92, 



fig. 4. 



This is the perfect example of a species that rinds itself classified in 

 different genera depending upon its life cycle. With the balloon 

 chamber, it is Tretomphalus; without the balloon chamber, it is 

 Rosalina. 



As a Tretomphalus it is characterized by the very neat, circular cap- 

 like Rosalina stage with the suture between the Rosalina stage and the 

 balloon chamber (as observed from the side) being a straight line. 



Tretomphalus concinnus is found around Fiji and at Port Lottin 

 and Guam Anchorage. 



TRETOMPHALUS MILLETTI (Heron-Allen and Earland) 



Plate 18, Figure 2 



Cymbalopora bulloides d'Orbigny.— Millett, 1903, Journ. Roy. Micr. Soc, 



p. 697, pi. 7, fig. 4. 

 Cymbalopora millelti Heron- Allen and Earland, 1915, Trans. Zool. Soc. London, 



vol. 20, p. 689, pi. 51, figs. 32-35. 

 Tretomphalus milletti (Heron-Allen and Earland). — Cushman, 1924, Carnegie 



Instit. Washington, Publ. 342, p. 36, pi. 11, fig. 4.— Cushman, 1934, Contr. 



Cushman Lab. Foram. Res., vol. 10, pt. 4, p. 87, pi. 11, figs. 4, 5; pi. 12, 



figs. 1-5. 

 Cymbalopora (Tretomphalus) bulloides d'Orbigny, sp. — Brady (part), 1884, Rep. 



Voy. Challenger, Zoology, vol. 9, p. 638, pi. 102, fig. 9 (not figs. 7, 8, 10-12). 



This distinctive species of Tretomphalus was described from the 

 Kerimba Archipelago off southeastern Africa and apparently has a 

 wide, though probably scattered, distribution in the Pacific. In the 

 present samples it is found in both shallow and deep water. 



