84 THE ANATOMY OF INVERTEBRATED ANIMALS. 



this sometimes contains only an oil-globule, at others cells, or 

 nuclei, and crystalline bodies. In the layer of protoplasm 



Fig h.—Sphoerozoum pundatum.—A, a mass of the natural size ; B, two of the oval 

 central sacs with the colored vesicles and spicula which lie in the investing pro- 

 toplasm, magnified. 



~s#.i^a?^:„ 



Fig. fS.—Sphcerozoum ovodimare (after Haeckel), magnified. 



from which the pseudopodia proceed, cellaeform bodies of a 

 bright -yellow color, which have been found to contain starch, 

 are usually developed,^ and this layer also gives rise to a skele 

 ton of a horny, or, more usuallj^, silicious 



character, which 



1 Even after the death of the Radiolarian, these yellow cells are said by Cien- 

 kowsky to thrive and multiply, aud the possibility that they may be parasites 

 must be borue in miud. 



