REPORT ON THE RADIOLARIA. 1737 



9. Ccelodendrum flabellatum, n. sp. (PI. 121, fig. 6). 



Terminal branches flabellate, irregularly ramified, each of the last two fork-branches being 

 divided into four or five diverging straight branches of different lengths ; usually the last eight or 

 ten ramules lie in a meridional plane ; their end-knobs cap-shaped, with a corona of recurved teeth. 



Dimensions. Diameter of the skeleton 2'0 to 2'5, of the valves 0'25 to 0'3. 



Habitat. North Pacific, Station 235 to 240, surface. 



10. Ccelodendrum serratum, n. sp. (PI. 121, fig. 5). 



Terminal branches flabellate, irregularly ramified like the preceding species ; it differs from this 

 in the strong compression of the broad, saw-shaped, terminal branches ; the two opposite edges 

 (placed in the meridional plane of the flabellum) are finely serrated ; their end-knobs with a corona 

 of diverging teeth. 



Dimensions. Diameter of the skeleton 3'0 to 3'2, of the valves 0'3 to 0'36. 



Habitat. Central Pacific, Stations 270 to 274, depth 2350 to 2925 fathoms. 



Subfamily 2. CCELODRYMIDA, Haeckel. 



Definition. C celodendrida with an external bivalved lattice-mantle, produced 

 by the anastomosing branches of the hollow radial tubes. 



Genus 729. Ccelodrymus, 1 Haeckel, 1879, Sitzungsb. med.-nat. Gesellsch. 



Jena, Dec. 12, p. 6. 



Definition. C oelodendrida with an external bivalved lattice-mantle, produced 

 by the anastomosing terminal branches of the hollow tubes, which are connected in a 

 spherical face. 



The genus Ccelodrymus, and the following closely allied genus Ccelodasea, represent 

 together the small subfamily Coelodrymida, differing from the Ccelodorida in the 

 possession of an outer bivalved lattice-mantle. They exhibit therefore the same relation 

 to the latter, that in the following family the Cceloplegmida bear to the Ctelotholida. 

 The bivalved spherical mantle is composed of a simple lattice-plate in Ccelodrymus, of 

 a spongy framework in Ccelodasea ; the anastomosing branches of the hollow radial 

 tubes become connected in the former in a spherical face, in the latter in the form of a 

 spongy framework. 



1 Caslodrymus = Forest of hollow trees, xoiAoj Sji/^etof. 

 (ZOOL. CHALL. BXP. PART XL. 1886.) Rr 218 



