REPORT ON THE RADIOLARIA. 1735 



Taf. xiii. figs. 1-3 (not 4) and Taf. xxxii. fig. 1 (not 2 and 3). Ccelodendrum has 

 been derived from Coelodoras by furcation and repeated dichotomous ramification of 

 the hollow radial tubes which arise from the galea. 



Subgenus 1. Ccelodendridium, Haeckel. 



Definition. Eamification of the hollow tubes regularly dichotomous, each branch 

 being forked again; therefore the two terminal ramules of the last branches equal. 



1. Ccelodendrum ramosissimum, Haeckel. 



Ccelodendrum ramosissimum, Haeckel, 1862, Monogr. d. Radiol., p. 363, Taf. xiii. figs. 1-3. 

 Ccelodendrum ramosissimum, R. Hertwig, 1879, Organism, d. Radiol., p. 93, Taf. x. figs. 3, 12. 



Terminal branches regularly forked, with two equal, smooth, nearly straight or slightly curved 

 fork-branches, diverging at right angles ; their end-knobs with four crossed (or sometimes five or 

 six) short recurved teeth. 



Dimensions. Diameter of the spherical skeleton 1*2 to 1*8 of the two central valves 0'2 to 0'25. 



Habitat. Cosmopolitan ; Mediterranean, Atlantic, Indian, Pacific ; many Stations, surface and 

 at various depths. 



2. Ccelodendrum spinosissimum, n. sp. (PL 121, fig. 7). 



Terminal branches regularly forked, with two equal, smooth, straight, fork-branches, diverging 

 at right angles, their end-knobs echinoidal, subspherical or club-shaped, with numerous short radial 

 thorns. 



Dimensions. Diameter of the skeleton 2 to 2 - 2 of the two central valves 0'25 to 0'03. 



Habitat. Tropical Atlantic, Stations 346 to 349, surface. 



3. Ccelodendrum fur catissimum, n. sp. (PI. 121, fig. 1-4). 



Terminal branches regularly forked, with two equal, smooth, straight, or slightly curved fork- 

 branches, diverging at acute angles ; their end-knobs very small, with three short, diverging, conical 

 teeth. 



Dimensions. Diameter of the skeleton 2 to 2'5, of the two central valves 0'3 to 0'4. 



Habitat. Cosmopolitan ; Atlantic, Indian, Pacific; many Stations, surface, and at various depths. 



4. Ccelodendrum bifurcum, n. sp. 



Terminal branches regularly forked, with two equal, smooth, more or less curved fork-branches, 

 diverging at acute angles ; their end-knobs thin, with two slender, parallel, bristle-shaped teeth. 

 Dimensions. Diameter of the skeleton 0'6 to 0'8, of the two central valves 01 to 015. 

 Habitat. North Pacific, Stations 252 to 256, surface. 



