Vol. 55.] DEVONIAN EOCES OF NEW SOUTH WALES. 49 



there are nine exposed in the section ; the pores are about as wide 

 again as the lattice-bars between them. There are indications of 

 siliceous rods, like those of Stigmosplicera, within the test. Diameter 

 of test, 0'135 mm. ; thickness of waU, 0*01 mm. ; width of pores, 

 0*01 mm. ; length of spines, 0*02 to 0*06 mm., and thickness at base, 

 0-015 to 0-02 mm. Eare. In volcanic tuff. No. 387 n. 



AcANTHOsPH^KA Ethesidoei, sp, nov. (PI. YIII, fig. 24.) 



Test small, with delicate lattice-frame and circular pores ; the spines 

 are slender and elongate: nine are shown in the specimen. In 

 the interior of the test there are six rods, three radiating from each 

 end of a small central bar ; they extend to the surface of the test, 

 and apparently connect with the radial spines. Diameter of test, 

 0-085 mm. ; width of pores, O'Ol mm. ; longest spine, 0*14 by 0*01 

 mm. at the base. In volcanic tuff. This species is closely related to 

 A. laxa, Hiude & Pox, from the Culm of Devon, ^ but it is considerably 

 smaller. It is named in honour of Mr. Eobert Etheridge, jun., of 

 the Australian Museum, Sydney. 



Genus Heliosph^ea, Haeckel. 



The test is a simple latticed sphere, with large radial and inter- 

 mediate smaller secondary spines. 



Heliosph^ra eobusta, sp. nov. (PL VIII, fig. 2b.) 



The test, as seen in section, has thick walls, with pores about 

 half as wide again as the lattice-bars ; six primary radial spines, 

 of varying length, are shown : they are prismatic in section. The 

 secondary spines are very minute, and they seem to be present on each 

 node of the mesh. Portions of siliceous rods are seen within the test. 

 Diameter of test, 0"14 mm, ; thickness, 0-015 mm. ; width of pores, 

 0-01 mm. ; length of spines, 0'025 to O'l mm., and thickness at base, 

 0-02 to 0-03 mm. Eare. Occurs in volcanic tuff. No. 387 d. 



Heliosph^ea TAiiwoETHi, sp. uov. (PI. YIII, fig. 26.) 



The pores in the test are slightly wider than the lattice-bars ; the 

 larger radial spines are conical, and evenly tapering : nine of them 

 are shown in the section ; the secondary spines differ only in size 

 from the larger. Diameter of test, 0-14 mm.; thickness, O'Ol mm. ; 

 length of primary spines, 0-06 to 0-1 mm. ; thickness at base, 

 0-02 mm. Differs from the preceding in its thinner walls, more 

 tapering primary and larger secondary spines. In siliceous lime- 

 stone. No. 245 3. 



Heliosphjera penesteata, sp. nov. (PI. YIII, fig. 27.) 



The test has rounded and oval pores of different sizes, with 

 relatively wide lattice-bars. The larger spines are elongate-conical ; 

 they are connected with the test by slender tripodal extensions 

 of their bases. The secondary spines are numerous and minute. 



^ Quart. Journ. Geol. Soc. toI. U (1895) p. 637 & pi. xxri, fig. 6. 



Q. J. G. S. No. 217. E 



