46 DR. G. J. SmLB ON THE EADIOLAlilA IN THE [Feb. 1 899, 



Stylosph^ra vetusta, sp. nov. (PI. YIII, fig. 10.) 



The cortical sphere is only shown in section ; the wall is thin, and 

 the pores are small ; the medullary sphere is smooth, with delicate 

 somewhat subangular pores. The spines very gradually taper. 

 Diameter of cortical test, 0"11 mm. ; of medullary test, 0*04 mm. ; 

 length of spines, 0-105 mm., and thickness at base, 0*02 mm. In 

 volcanic tuff. No. 387 d. 



Genus Statjrosph^ra, Haeckel. 



The test is a simple latticed sphere, with four equal radial spines 

 disposed crosswise. 



Staueosph^ea (?) OENATA, sp. nov. (PL YIII, fig. 11.) 



Surface of the test smooth, wall moderately thick, pores rounded, 

 unequal, the lattice-bars about half the width of the pores. Only 

 one of the four spines is now intact ; this is tapering, keeled, and 

 has, at its extremity, four minute rays or spines diverging at 

 right angles. Of the other spines, two are only indicated by short 

 stumps, and the termination of the fourth is concealed. Diameter 

 of test, 0*095 mm. ; thickness, 0*01 mm. ; length of spine, 0*12 mm., 

 and thickness at base, 0'022 mm. In volcanic tuff. No. 387 d. 



Staijeosph^ea pusilla, sp. nov. (PI. YIII, fig. 12.) 



Test small, wall thin, with irregular, large and small, subangular 

 pores and slender lattice-bars ; the radial spines are short, keeled, 

 and acutely pointed. Only three are shown, the place of the fourth 

 being concealed by matrix. The interior of the test has six or more 

 slender rods radiating from the ends of a short central bar of the 

 same character as those in the genus Stigmosjjhoet^a, Haeckel. 

 Diameter of test, 0*065 mm. ; width of largest pores, 0*015 mm. ; 

 length of spine, 0*04 mm., and thickness at base, 0*02 mm. Rare. 

 Pound in volcanic tuff. No. 387 d. 



Genus Statjeolonche, Haeckel. 



The test consists of two concentric latticed spheres, with four 

 simple, equal, radial spines disposed crosswise. 



Staueolonche Davidi, sp. nov. (PL YIII, fig. 13.) 



The cortical test has numerous small surface-spines and circular 

 pores. The radial spines are stout, keeled, and terminate obtusely. 

 The inner sphere has minute rounded pores. Diameter of test, 

 0*11 mm.; of the medullary sphere, 0*05 mm.; length of spines, 

 0*15 mm., and thickness at base, 0*035 mm. This form appears to 

 be very common in the dark siliceous limestones of Tamworth, but as 

 a rule the spines are seldom preserved intact, and in the specimen 

 figured only one is complete. Some of the forms figured by 

 Prof. T. W. E. David ^ probably belong to this species. 



1 Proc. Linn. Soc. N.S.W. ser. 2, vol. xi (1896) pi. xxxviii, figs. 1, 4 & 8. 



