THE FAMILY MILIOLID/E 85 



This species was met with in some abundance 

 in the deep-water area of the northern part of the 

 North Atlantic during the dredging operations by 

 Professor Sars, who found the bottom temperature 

 of the water nearly uniform, only varying from 

 32° F. to 34-9° F. between the depths of 300 and 2,000 

 fathoms. The mud from the bottom is a light- 

 coloured ooze, and was called BiJocuIina uiud, since it 

 was supposed to be almost entirely formed of the 

 tests of BiJoc/iInuF. This does not seem to be the 

 case, however, for it has been shown that after the 

 fine silt was washed away the BiJoculince only 

 constituted 50 per cent, of the dried material. 



Eocene to Beceiif. (Plate 2, figs. K and L.) 



Genus Fahiilaria, Defeance. 



The chambers are arranged in one plane, as in 

 Biloculina, but the chamber cavities are subdivided 

 or partitioned off into chamberlets and labyrinthulai 

 by shell projections and partitions, which results 

 in the sarcode having to occupy numerous little 

 channels throughout the shell, with perhaps the 

 exception of the earlier chambers, as shown by 

 Schlumberger in the case of the Miocene specimens. 

 The aperture is porous or cribrate (sieve-like). 

 Lower and Middle Eocene and Miocene. 



Example. — F. discolitlnis^ Defrance, ' Diet. Sci. 

 Nat.' vol. xvi. 1820, p. 103; 'Atlas Zooph.' pi. 

 xlviii. fig. r5. 



The genus is very restricted in its range and is 

 entirel}^ fossil. It is best known by the above 



