44 DE. G. J. HINDE ON THE RADIOLAEIA IN THE [Feb. 1 899, 



Cenosph^ea AEEiNis, sp. nov. (PL VIII, fig. 3.) 



This form corresponds in size with the preceding, but the pores 

 are more regular and nearly circular, and the surface-spines are 

 more prominent. Diameter of test, 0*1 to 0*13 mm. ; of the pores, 

 0*015 mm. ; length of spines, 0*03 mm. In the siliceous limestones 

 and in the volcanic tuff. Nos. 245 3, 387 d. 



Genus Liosph^ka, Haeckel. 



The test consists of two concentric latticed spheres, both extra- 

 capsular. 



LiosPH^RA (?) sp. ind. (PL VIII, fig. 4.) 



The specimen is only shown in section, and the pores are not 

 distinguishable; the inner sphere is connected with the outer by 

 numerous rods, which extend as small ispines beyond the surface 

 of the outer test. The lower portion of a stouter spine is also 

 present. Diameter of the outer sphere, 0-145 mm. ; of the inner, 

 0-09 mm. Rare. In siliceous limestone. No. 245 3. 



Genus Ehodosph^ea, Haeckel. 



The test is composed of three concentric spheres, one meduUary 

 and two cortical. 



Rhodosphjera Ruesti, sp. nov. (PL VIII, fig. 5.) 



The cortical tests are only shown in section, and the outer one is 

 but imperfectly preserved. Numerous rods or spokes connect the 

 medullary with the cortical spheres, and some of these are extended 

 into short spines. The medullary test has nearly circular pores, and 

 there are indications of rods radiating from its centre. Diameter 

 of outer test, 0*155 mm. ; of the inner cortical, 0*13 mm. ; and of the 

 medullary, 0*1 mm. Rare. Pound in dark siliceous limestone. 

 No. 245 3. The species is named in honour of Dr. H. Riist, of 

 Hanover. 



Genus Spongoplegma, Haeckel. 



An outer cortical sphere of spongy framework, enclosing in the 

 centre a single latticed sphere. 



SPONGOPLEajVTA AUSTEALE, Sp. nOV. (PL VIII, fig. 6.) 



The cortical test consists of a minutely porous mesh, and the 

 exterior surface is somewhat rough. The medullary test is smooth, 

 delicate, and with minute, somewhat subangular, pores ; it is con- 

 nected with the porous test by numerous slender rods. Within the 

 medullary test there are several very small, free, spicular bodies, 

 having three or four rays, not unlike Sj)hcerozoum-5^icu\es, but of 

 a more slender character. Diameter, 0*12 mm. ; thickness of spongy 

 sphere, 0*02 mm. ; diameter of the medullary test, 0*065 mm. Rare. 

 Found in volcanic tuff. No. 387 d. 



