52 DE. G. J. HINDE ON THE EADIOLAEIA IN THE [Fch. 1B99, 



short and slender. Major axis, 0*12 mm. ; minor, 0*1 mm. ; thickness 

 of wall, 0-01 mm. ; width of pores, O'OOT mm. ; longest polar spine, 

 0*22 mm., and thickness at base, 0*045 mm. ; transverse spine, 0*06 

 by 0-015 mm. The medullary test is 0*055 by 0*04 mm. In 

 siliceous limestone. No. 245 3. The lower axial spine in the 

 specimen figured is imperfect ; it seems to have been originally as 

 thick as the spine opposite to it. 



Staurodetjppa ntjctjla, sp. nov. (PI. IX, fig. 7.) 



The cortical test is regularly oval in outline ; the lattice-frame 

 of the oval medullary test is very delicate ; the pores are minute 

 and rounded or subangular. The radial spines are keeled or 

 prismatic, and nearly equal in length. Major axis of cortical test, 

 0*105 mm., and minor, 0*085 mm. ; major and minor axes of inner 

 test, 0*05 and 0*035 mm. Length of spines, 0*09 to 0*11 mm. ; 

 thickness at base, 0*03 mm. In siliceous limestone. No. 245 3. 



Staubodruppa nana, sp. nov. (PI. IX, fig. 8.) 



The cortical test small, short-oval, thin, with circular pores ; the 

 medullary regularly oval, very delicate, with subangular pores. 

 The radial spines are short, slender, conical, probably imperfect. 

 Outer test, 0*065 by 0*06 mm. ; inner, 0-035 by 0-03 mm. ; width of 

 spines, 0-02 mm. Eare. In siliceous limestone. No. 245 3. 



The test is ellipsoidal, with an irregularly reticulate or spongy 

 framework and central cavity, without medullary shell. There are 

 two opposite radial spines, and within the test slender rods similar 

 to those in JStigmosphcera, Haeckel, or a central spicular body. 



This genus may be compared with Spongoprunum^ Haeckel,^ 

 in which, however, the interior cavity of the test is filled with 

 a reticulate or spongy structure. 



SpONGOCCELIA CITEEtFM, sp. UOV. (PI. IX, fig. 18.) 



The test is regularly oval in outline, with a minutely porous wall 

 of reticulate tissue, and within it are delicate siliceous rods, now 

 displaced. At either pole there is a short, stout, keeled, radial 

 spine, probably similar originally. Length of test, 0*165 mm. ; 

 width, 0*15 mm.; length of radial spine, O-OU mm., and thickness at 

 base, 0*05 mm. In volcanic tuff. No. 387 n. 



Spongoccelia oliva, sp. nov. (PI. IX, fig. 19.) 



The test is oval, with a minutely reticulate structure; in the 

 centre there is a small three-rayed spicular body. At one pole is 

 a slender elongate radial spine, and at the opposite a much shorter 

 one. Length of test, 0*125 mm. ; breadth, 0*1 mm.; principal spine, 

 0-14 mm. in length. In siliceous limestone. No. 245 3. 



* STToyyoe, sponge ; koIXo?, hollow. 



^ Challenger Report on the Radiolaria, Zool. vol. xviii, pt. i (1887) p. 347. 



