ART. 25 GENERA SIPHOGENEEINA AND PAVONINA CUSHMAN 9 



1,618 fathoms, and from nine stations in the Phihppine region, rang- 

 ing in depths from 78 to 554 fathoms. 



Heron-Allen and Earland record the species from the Kerimba 

 Archipelago ^° as follows: 



At Stn. 10 the specimens are of a regular type, cylindrical in section, similar to 

 Brady's figures. At Stn. 1 1 the specimens are large, oval in section, and character- 

 ized by a bifarine arrangement of the middle chambers, the septa, which are 

 limbate, running in a zigzag direction. The shells thus appear to present a 

 transition type between S. striata and S. bifrons Brady. 



The figured specimens from the Kerimba region show specimens 

 which seem to belong to Boliviiia or Bifarina and not to SipJiogen- 

 erina, nor do they suggest S. hifrons, which is a very well character- 

 ized species, even though it has a striate variety. The ornamenta- 

 tion of the figured specimens suggests Bolivina rather than Sijjhogen- 

 erina. 



SIPHOGENERINA IRREGULARIS (Bagg) 



Plate 1, figs. 11, 12 



Sagrina irregularis Bagg, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 152, pi. 5, 



figs. 8-10. 

 Siphogenerina irregularis Cushman, Bull. 71, U. S. Nat. Mus., pt. 3, 1913, 



p. 109, pi. 47, figs. 6, 7. 



Description. — Test elongate, subcylindrical ; chambers somewhat 

 irregular, but becoming uniserial in the last-formed portion; sutures 

 distinct, depressed; wall thin, translucent, surface with numerous, 

 slightly raised, longitudinal costae; apertural end of the chamber 

 depressed, the aperture with a long slender cylindrical neck and 

 slightly flaring lip. 



Length, 0.75-1.50 mm. 



Distribution.— l:^othmg is known of this species outside the region 

 of the Hawaiian Islands. Bagg originally described it from Albatross 

 collections off the Hawaiian Islands in 275-384 fathoms. I later had 

 it from Albatross and Nero stations in the same region, in 268-392 

 fathoms. 



The distinguishing characters of the species are the thin wall, 

 numerous longitudinal costae, and especially the peculiar way in 

 which the apertural neck is set down into a depression of the last- 

 formed chamber. 



Young specimens which have not yet developed the uniserial char- 

 acter very strongly resemble Uvigerina nitidula Schwager.*^ I have 

 recorded it from the Lower Oligocene (Prof. Pap. 133, U. S. Geol. 

 Surv., 1923, p. 35) but these specimens probably belong elsewhere. 



10 Trans. Zool. Soc. London, vol. 20, 1915, p. 677. 



" iyo!;aro-E.\ped., Qeol. Theil., vol. 2, 1867, pi. 7, fig. 93. 



53650— 26t 2 



