Vol. 55.] DEVONIAN ROCKS OF NEW SOUrH WALES. 55 



Spongodiscus scutulatus, sp. nov. (PI. IX, fig. 17.) 



The test is elongate-oval in outline, depressed ; the central area 

 is nearly free from tissue, but there is no defi.nite inner test ; the 

 structure is very minute and irregularly reticulate, with numerous 

 radial bars, which are not extended beyond the margin. Length of 

 test, 0*185 mm. ; breadth, 0*12 mm. ; width of pores, 0*005 mm. 

 In siliceous limestone. ISo. 245 3. 



Genus Spongolonche, Haeckel. 



Test discoidal, of irregular reticulate or spongy structure, with. 

 two opposite radial spines. 



Spongolonchb lens, sp. nov. (PI. IX, fig. 20.) 



The test is elongate-oval ; the wall-structure is minutely porous ; 

 the reticulate tissue is disposed in four or five concentric layers, 

 and there are also traces of a radial arrangement as well. There 

 is an oval space in the centre of the test, now partly filled with 

 amorphous matrix. At either end of the main axis is a stout 

 conical spine. Length of test, 0*22 mm.; breadth, 0*16 mm.; length 

 of spines, 0*25 mm. and 0*185 mm. Hare. In siliceous limestone. 

 Ho. 245 3. 



Genus Spongotripus, Haeckel. 



Test discoidal, of porous, reticulate or spongy framework, with 

 three solid radial spines on the margin. 



Spongotripus patella, sp. nov. (PI. IX, fig. 21.) 



The test is depressed, rounded in outline ; the surface-structure is 

 irregularly reticulate, but beneath this the framework has a radial 

 arrangement, and looks as if numerous slender bars extended from 

 the borders of a central area in which no structure is shown. Only 

 two radial spines are preserved. Diameter of test, 0*25 mm. ; 

 longest spine, 0*16 mm. ; thickness at margin, 0*04 mm. Bare. In 

 volcanic tuff. No. 387 d. 



Spongotriptjs penestratijs, sp. nov. (PI. IX, fig. 22.) 



The test is oval in outline, depressed ; the surface-reticulation in 

 the central portion of the test has circular and subangular pores ; 

 nearer the margins the reticulations are finer, and a radial arrange- 

 ment prevails. Two stout, conical, radial spines are preserved, and 

 the base of a third. Diameters of test, 0*175 by 0*14 mm. ; length 

 of spines, 0*1 to 0'115 mm., and thickness, 0*035 mm. In siliceous 

 limestone. No. 245 3. The upper part of the specimen figured 

 is incomplete. 



