Yol. 55.] DEVONIAN EOCKS OF NEW SOUTH WALES. 45 



Genus DoEYSPHiEKA, Hinde. 



The test is a simple latticed sphere, with a single radial spine. 

 Secondary smaller spines are also occasionally present. 



DOEYSPH^EA ECHINATA, Sp. nOV. (PI. YIII, fig. 7.) 



Test thin, the lattice-pores rounded or polygonal, unequal in size ; 

 the radial spine now slender and styliform, probably much stouter 

 originally : the surface of the test is also covered with numerous 

 minute secondary spines. Diameter of test, O'l mm. ; width of larger 

 pores, 0"01 mm. ; length of radial spine, 0*1 mm. In siliceous lime- 

 stone. No. 245 3. This species differs from those of the same 

 genus in the Ordovician chert of Scotland by its smaller size and 

 the secondary spines ;^ while its size and irregular pores also dis- 

 tinguish it from DorysphcBra {Monostylus) hirsuta (Cayeus).^ 



Genus Xiphosph^^ea, Haeckel. 



The test is a simple latticed sphere, with two free radial spines 

 in the same axis. 



XlPHOSPH^EA MINAX, Sp. nOV. (PI, YIII, fig. 8.) 



The test is relatively thick, the lattice-pores and bars are small 

 and about equal in width, the spines long, stout, and with a central 

 keel. They are now unequal in length, but this probably arises 

 from their imperfect preservation. Diameter of test, 0-127 mm. ; 

 thickness, 0*02 mm. ; width of pores, about 0*007 mm. ; length of 

 longest spine, 0-3 mm., and thickness at base, 0045 mm. In siliceous 

 limestone. No. 245 3. This form approaches near to X. macrostyla, 

 Riist, from the Upper Devonian of the Harz,^ but the pores are 

 smaller and the spines longer. 



Genus Stylosph^ea, Ehrenberg. 



The test consists of two concentric latticed spheres, with two 

 opposite radial spines. 



Stylosph^ea obttjsa, sp. nov. (PI. YIII, fig. 9.) 



The cortical test has a thin wall and smooth surface. The lattice- 

 pores are wider than the bars between them. The medullary sphere 

 is only faintly shown ; the pores in it are small and delicate. This 

 inner test is connected with the outer by the basal portion of the 

 spines, which are stout, keeled, gradually tapering and obtusely 

 pointed. Diameter of test, 0-115 mm. ; thickness of wall, 0-01 mm. ; 

 width of pores, 0-0075 mm. ; diameter of inner sphere, 0-045 mm. ; 

 length of spines, 0-22 mm., and thickness at base, 0*045 mm. 

 In volcanic tuff. No. 387 d. 



1 Ann. & Mag. Nat. Hist. ser. 6, vol. vi (1890) pp. 52-53 & pis. iii & iv. 



2 ' Etude microgr. des Terr, sediment.' 1897, p. 189 & pi. vii, fig. 12. 

 ^ Palaeontograpbica, vol. xxxviii (1892) p. 141 & pi. ix, fig. 10. 



