REPORT ON THE RADIOLARIA. 9 



surface, and are in general rather fluid, exhibiting a considerable tendency to ramify, 

 anastomose, and form networks. The movement of granules is commonly lively. In the 

 Polycyttaria all capsules of one colony or "ccenobium" are connected by the dense variable 

 network of anastomosing pseudopodia. 



Synopsis of the Orders and Suborders of SPUMELLAEIA. 



I. COLLODARIA. / Skeleton entirely wanting, . . . . . 1. Colloidea. 



Skeleton wanting or quite \ 

 imperfect, not latticed. ( Skeleton represented by numerous scattered spicules, . 2. Beloidea. 



II. SPH^ERELLARIA. 



Skeleton a perfect shell of 

 lattice work, or spongy and 



Lattice-shell spherical or composed of concentric spheres, 3. Sphseroidea. 

 Lattice-shell ellipsoidal or prolonged in one axis, . 4. Prunoidea. 



Lattice-shell discoidal or shortened in one axis, . . 5. Discoidea. 



resembling wicker-work. 



Lattice-shell lentelliptical, with different extent of growth 



in three axes, . . . . .6. Larcoidea. 



Order I. COLLODARIA, Haeckel, 1881. 



Collodaria, Haeckel, Prodromus, 1881, p. 469. 



Collida et Sphcerozoida, Haeckel, 1862, Monogr. d. Radiol., pp. 246, 522. 



Definition. SPUMELLARIA without latticed shell. 



The order Collodaria, the first order of Radiolaria, comprises all those 

 SPUMELLARIA in which the skeleton is either entirely wanting, or represented by 

 numerous single, solid, siliceous needles or spicules, loosely scattered in the calymma 

 around the central capsule. Never in this order is there any trace of the latticed or 

 fenestrated shell, which characterises the second order, Sphserellaria. The skeleton 

 exhibits no trace of phylogenetic connection in the two orders. 



In my monograph (1862) two families appertaining to this order are described, the 

 Collida (p. 244) and the Sphserozoida (p. 521). Both families contain forms with and 

 without a skeleton. Of the solitary or monozous Collida the Thalassicollida are devoid 

 of a skeleton, whilst the Thalassosphserida are provided with a skeleton. Of the social or 

 polyzous Sphserozoida the Collozoida are without a skeleton, the Rhaphidozoida provided 

 with one. As the special form in both skeletophorous subfamilies is exactly the same, 

 I prefer now to associate them in the suborder Beloidea, and to oppose them to the 

 other two skeletonless subfamilies, which are united under the name of Colloidea. 



(ZOOL. CHALL. EXP. PART XL. 1885.) Rr 2 



Jr 



