1736 THE VOYAGE OF H.M.S. CHALLENGER. 



5. Coelodendrum gracillimum, Haeckel. 



Coelodendrum gracillimum, Haeckel, 1862, Monogr. d. RadioL, p. 364, pi. xxxii. fig. 1. 



Terminal branches regularly forked, with two equal, spinulate, curved fork-branches, diverging 

 at obtuse angles and covered with numerous small thorns ; their end-knobs cap-shaped, with a 

 corona of six to eight small recurved teeth. In one specimen of this species (in 1859) I found 

 entangled the fragments of Ccelographis gracillima, figured in Taf. xxxii. figs. 2, 3, loc. cit. I supposed 

 at that time, erroneously, that the latter belonged to full-grown specimens of the former. 



Dimensions. Diameter of the skeleton 1 to 1'2, of the valves 0'15 to 0'2. 



Habitat. Mediterranean (Messina), surface. 



6. Coelodendrum lappaceum, n. sp. 



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

 branches, diverging at acute angles and covered with small recurved hooks ; their end-knobs large, 

 conical, with a prominent apex and a basal corona of six to eight recurved teeth. 



Dimensions. Diameter of the skeleton 1-5 to 1'8, of the valves 0'22. 



Habitat. South Pacific, Stations 285 to 295, depth 1500 to 2600 fathoms. 



Subgenus 2. Ccelodendronium, Haeckel. 



Definition. Ramification of the hollow tubes more or less irregular, mainly in the 

 periphery; the terminal ramules of the last branches unequal. 



7. Coelodendrum cervicorne, n. sp. (PL 121, fig. 8). 



Terminal branches irregularly ramified, with unequal, smooth, curved ramules, diverging at 

 obtuse angles, their end-knobs echinoidal, small, with short, diverging, conical thorns. 

 Dimensions. Diameter of the skeleton 1 to T2, of the valves 0'2. 

 Habitat. South Atlantic, Station 332, depth 2200 fathoms. 



8. Ccelodendrum digitatum, n. sp. 



Terminal branches irregularly ramified, with unequal, spinulate, straight ramules, diverging at 

 acute angles ; the two last fork-branches digitate, each with five diverging finger-shaped ramules, 

 lying in a meridian plane ; their end-knobs conical, pointed, with a corona of recurved hooks. 



Dimensions. Diameter of the skeleton 1*6, of the valves 0'24. 



Habitat. Indian Ocean, Madagascar (Rabbe) surface. 



