NARRATIVE OF THE CRUISE. 



223 



in the Spumellaria and Nassellaria (which are often united under the name Polycystina) 

 they are solid rods or threads. In some cases the skeleton exists only outside the central 



capsule, whilst in others it is also 

 found within it. The skeleton 

 presents in most cases the appear- 

 ance of a delicate lattice-work, and 

 is armed with spines often resem- 

 bling that of Sponges. 



" The geometrical figure of the 



Fig. 91,—IIaliomma xcyvillei, n. sp. 



Fig. 92. — Ilexancistra qiiadricuspis, n. gen. et sp. 



Holotrypasta is fundamentally a sphere (homaxon), but in the Merotrypasta it is conical 

 or egg-shaped (monaxon). 



" The Acantharia, which are distinguished from all other Radiolaria by their organised 



Fig. 93. — Eureoryphalus huxleyi, n. sp. 



Fig. 94. — Cinclopyramis murrayana, n. gen. et sp. 



skeleton of acanthin, have, for the most part, a spherical central capsule, whose 

 simple membrane is everywhere perforated by fine pores. Their nucleus becomes 

 early divided into numerous small spore-nuclei ; and the skeleton always consists 



