FORAMIlSriFERA OF THE ATLANTIC OCEAN. 



57- 



to 1,181 fathoms (359 to 2,160 meters), and Flint from a number of 

 stations, four off the eastern coast of the United States, two in the 

 Gulf of Mexico, and one off the coast of Brazil, ranging in depth 

 from 732 to 1,226 fathoms (1,339 to 2,243 meters). 



I have seen material from but three stations and two of these off 

 the northeastern coast of the United States, the other in the northern 

 part of the Gulf of Mexico. 



Verneuilina propinqua — material examined. 



VERNEUILINA ADVENA Cushman. 



Plate 9, figs. 7-9. 



Verneuilina polysiropha Heron-Allen and Earland (not Reiiss), minute form, 

 Proc. Roy. Irish Acad., vol. 31, pt. 64, 1913, p. 55 (in part), pi. 4, figs. 3-5 

 (not 1, 2). 



Verneuilina advena Cushman, Res. Hudson Bay Exped., 1920, no. 9, 1922, p. 9. 



Description. — ^Variety differing from the typical in the smaller 

 size and more slender form. 



Length 0.17-0.30 mm.; breadth 0.07-0.1 mm. 



Distribution. — This small variety is more closely allied with V. 

 arenacea (Williamson), than any other species and seems to be found 

 on both sides of the Atlantic. 



Heron- Allen in the above reference refer to it as follows: 



At a few stations a minute variety occurs in very small numbers, which we have 

 observed at many other localities wherethe larger type [ V. polystropha] is abundant. 

 It exactly resembles the common types, but is normally only one-eighth of their size, 

 though often possessing a far greater number of chambers than the larger specimens. 



. . . . It is possible tliat these minute individuals may represent the micro- 

 spheric form, but, owing to the difficulty of observing the primordial chamber in 

 this species, we are unable to make any definite pronouncement in this point. 



Figures of the typical form after Williamson are given on plate 10, 



figures 5, 6. 



Verneuilina advena — material examined. 



53568—22- 



