124 THE FOEAMINIFERA 



fossil species seems to have been calcareous. >S. 

 spJicerica is dredged up in considerable numbers 

 from some localities ; in this it resembles the 

 occurrence of the fossil species. Becent. (Plate 6, 

 fig. D.) 



Su h-fa m Uij Rhabdamminin.e . 



Test composed of firmly cemented sand-grains, 

 often with sponge spicules intermixed ; tubular, 

 straight, radiate, branched, or irregular ; free or 

 adherent ; with one, two, or more apertures ; rarely 

 segmented. 



Genus JacideUa, Beady. 



Test elongate, tapering ; aperture at the broad 

 end. BecerJ. 



Example. — J. acuta, Brady, ' Quart. Journ. Micr, 

 Sci.' vol. xix. N.S. 1879, p. 35, pi. iii. figs. 12, 13. 



In this species the test is elongate, closed, and 

 pointed at one end, gradually increasing in width 

 towards the other. The walls are coarsely arenaceous. 

 Length ^ to 1 inch, or even more. It has a wide 

 geographical distribution. Becent. (Plate 6, fig. E.) 



Genus Huperaviviina, Beady. 



Test elongate, tubular, the closed end broad and 

 rounded, sometimes inflated, so as to form a distinct 

 chamber ; tube simple or branched, free or adherent. 

 Sihcrian to Becent. 



Example. — H. vagans, Brady, ' Quart. Journ. Micr. 

 Sci.' vol. xix. N.S. 1879, p. 33, pi. v. fig. 3. 



