FOEAMINIFEKA OF THE PHILIPPINE AND ADJACENT SEAS. 279 



meters); D5638, Bouro Island (south) and vicinity, 517 fathoms 

 (946 meters); D5666, Macassar Strait, 272 fathoms (498 meters), 

 bottom temperature 47.5° F. (8.6° C). 



Both microspheric and megalospheric forms occur, the megalo- 

 spheric more common. At the only station at which a record was 

 kept 11 were megalospheric and two were microspheric. 



Siphogenerina bifrons, var. striatula — Material examined. 



SIPHOGENERINA DIMORPHA (Parker and Jones). 



Plate 56, fig. 8. 



Uvigerina (Sagrina) dimorpha Parker and Jones, Philos. Trans., vol. 155, 1865, 



p. 420, pi. 18, fig. 18. 

 Sagrina dimorpha H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 



582, pi. 76, figs. 1-3. 

 Siphogenerina dimorpha Egger, Abh. kon. bay. Akad. Wiss. Miinchen, CI. 



II, vol. 18, 1893, p. 317, pi. 9, fig. 30.— Cushman, Bull. 71, U. S. Nat. Mus., 



pt. 3, 1913, p. 106, pi. 45, figs. 3, 4. 



This species was the least common of any of the genus, occm-ring 

 as single specimens or at most few. The following records are all 

 that were noted: D5300, China Sea, vicinity of southern Luzon, 265 

 fathoms (485 meters); D5601, Gulf of Tomini, Celebes, 765 fathoms 

 (1,399 meters); and D5666, Macassar Strait, 272 fathoms (498 me- 

 ters). The last station had a bottom temperature of 47.5° F. 

 (8.6° C), the others not being recorded. 



Siphogenerina dimorpha — Material examined. 



