Recent and Fossil Foraminifera. 343 



The test is almost spherical, slightly flattened at right angles 

 to the axis, consisting of eight or nine chambers coiled in an 

 involute spiral, the last four chambers only being visible externally. 

 There is a slight umbilical depression on either side, and the 

 neighbourhood of the aperture of the final chamber is surrounded 

 with stout but short tubercles which almost entirely conceal the 

 actual aperture. This apparently consists of the usual Nonionine 

 series of fine pores at the extreme line of junction of the last and 

 previous whorls. 



The specimens, which are all fossil, are generally well pre- 

 served ; a few are pyritized, the remainder, as a rule, deeply stained. 

 The perforations of the shell are extremely minute. 



We publish two further figures of the species in which the 

 position and nature of the tubercles are better shown than in the 

 previous drawings. 



Breadth, • 2-0 • 27 mm. Thickness, • 1-0 • 15 mm. 



