A CARBONIFEROUS FAUNA FROM NOWAJA SEMLJA. 147 



Order Radiolaria. 



Pounded portions of the limestone, after treatment with acid, indicated the presence 

 of a few siliceous organisms, among which were observed unrecognisable fragments 

 showing a regular lattice-work, and a whole radiolarian. The latter was filled with 

 some carbonaceous or ferrugineous substance, but the lattice-work could still be 

 detected, though not very distinctly. In thin sections the small bodies referred here 

 to Radiolaria are more easily seen, and the following genera appear to be represented : — 



Genus Cenospelera Ehrenberg. 

 Cenosphsera " sp." a. 



Simple spheres, the lattice- work of which is too indistinct for description, probably 

 belong here. They vary in diameter from 0*1 mm. to 0'3 mm., but it is not 

 possible to say how many " species " are present. 



Cenosphseral sp. b. 



I am in doubt concerning the generic affinities of a few small bodies, 0*1 mm. in 

 diameter, consisting of an apparently simple sphere, the surface of which is covered 

 with numerous short bristles. 



Genus Carposph^ra Haeckel. 



The genus is perhaps represented by small bodies measuring up to 0'2 mm. in 

 diameter, and apparently made up of two concentric spheres. The distance between the 

 two spheres is greater than the diameter of the smaller one ; there are still a few indica- 

 tions of lattice-structure, but the connecting rays are not preserved. 



Genus Cenellipsis Haeckel. 



In the form which I doubtfully refer to this genus, the test is simple and oval, and 

 its long diameter measures 0"15 mm. 



Class SPONGLE. 



The few spicules observed are slightly arcuate, with obtusely rounded extremities, 

 and bear a general resemblance to those of Renieria clavata Hinde, as described by 

 Dr G. J. Hinde.* The largest one is approximately - 6 long and 0"06 mm. thick. 



* A Monograph of the British Fossil Sponges, Pal. Soc, 1887, p. 143, pi. ix. fig. 5. 



