REPORT ON THE RADIOLARIA. 1735 



Taf. xiii. figs. 1-3 (not 4) and Taf. xxxii. fig. 1 (uot 2 and 3). Calodendrum lias 

 been derived from Ccelodoras by furcation and repeated dichotomous ramification of 

 the hollow radial tubes ^Ybicll arise from the galea. 



Subgenus 1. Ccelodendridium, Haeekel. 



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, Haeekel. 



Caelodendrmn ramomsimum, Haeekel, 1862, Monogr. d. Eadiol., p. 363, Taf. xiii. figs. 1-3. 

 Ccelodendrum ramosisdmiim, 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. 



Diiiiensions. — Diameter of the spherical skeleton 1'2 to 1'8 of the two central valves 0-2 to 0'25. 



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

 at various depths. 



2. Ccelodendrum spinosissimum, n. &]). (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. 



ffabitat. — Tropical Atlantic, Stations 346 to 349, surface. 



3. Ccelodendrum fur catissimum, n. sp. (PL 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. 



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



Habitat. — CosmopoUtan ; 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. 

 Diriwnsions. — Diameter of the skeleton 0'6 to 0'8, of the two central valves O'l to 015. 

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



