REPORT ON THE RADIOLARIA. 1737 



9. Coslodendrum flabellatum, n. sp. (PI. 121, fig. G). 



Terminal brauches 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. 



Bimciisions. — Diameter of the skeleton 2-0 to 2-5, of the valves 0-25 to 0-3. 



HabUat. — North Pacific, Station 235 to 240, surface. 



10. Coslodendrum serratum, n. sp. (PL 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. 



Ditnensions. — 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 ce 1 o d e n d r i d a with an external bivalved lattice-mantle, produced 

 by tlie anastomosing branches of the hollow radial tubes. 



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



Jena, Dec. 12, p. 6. 



Definition. — C celodendrida 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 Coelodasea, represent 

 together the small subfamily Ccelodrymida, difi'ering from the Coelodorida in the 

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

 to the latter, that in the following family the Coeloplegmida bear to the Coelotholida. 

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

 a spongy framework in Coelodasea ; 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 Ccslodrymm =FoTtat of hollow trees, xoiT^os i^vf*6s. 



(ZOOL, CHALL. EXP. PART XL. — 1886.) Er 218 



