336 rORAMINIFERA OF THE CRAG. 



Characters. — Shell free (or parasitic ?), subspherical, or shaped like a truncate 

 cone. Chambers very numerous, nearly equal in size ; arrangement mostly con- 

 fused. Surface marked by an angular areolation, due to the external prominence 

 of the liml)ate septa. 



/«i''''4ivjjj< »''<«. Gi/psina vesicularis (Parker and Jones). From Brady's Report 'Challenger,' &c., pi. cii, fig. 10. 



lfc'''^*'-'"''>'^"'/iiV 1 ' xlodiam. 



Fig. 25. 



Occurrence. — Brady states in the ' Challenger ' Report that the geographical 

 and geological distribution of this species is co-extensive with that of Gypsina 

 globnlus (Reuss) ; " they occur together in the coral sands of warm latitudes, at 

 depths ranging from the littoral zone to about 400 fathoms. Small examples are 

 occasionally met with on the northern and western shores of the British Islands." 



Fossil specimens have been recorded from the Miocene of Austria-Hungary, 

 Malta, and Jamaica, from the Pliocene of Costa Rica, and from Tertiary beds of 

 Palermo, Bordeaux, and San Domingo. 



Gypsina vesicularis is rare in the Crag. One specimen was found in the 

 Polyzoan Crag of Sudbourne. 



Family 6.— NUMMULINID^, Brady. 

 ' Challenger ' Report, 1884, p. 74. 

 Symmetrically spiral, possessing a supplemental skeleton and a canal-system. 



Sub-family 1. — Polystomellin^, Brady. 



' Challenger ' Report, 1884, p. 75. 



Bilaterally symmetrical, nautiloid. Lower forms without supplemental 

 skeleton or interseptal canals ; higher types with canals opening along the external 

 septal depressions. 



