1588 THE VOYAGE OF H.M.S. CHALLENGER. 



7. Aulospathis tetrodon, n. sp. (PI. 104, fig. 9). 



Eadial tubes without inflated termiual knob, with four crossed, divergent, slightly curved terminal 

 branches. Proximal whorl usually with an irregular cross of four lateral branches (often five or 

 six, rarely two or three instead of the usual four). 



Dimensions. — Length of the tubes 2-0 to 2-5, breadth 0-03 to 0'04 ; branches 0-2 to O'S. 



Halitat. — North Pacific, Stations 244 to 245, depth 2775 to 2900 fathoms. 



8. Aulospathis hexodon, n. sp. 



Eadial tubes withoiit inflated terminal knob, with three forked, curved branches at the distal 

 end, so that each tube usually bears six terminal branches; but other tubes of the same specimen 

 bear only three simple or a few irregularly forked branches. Proximal whorl usually with six 

 curved, irregular, lateral branches. 



Dimensions. — Length of the tubes 2-0 to 3'0, breadth 0'03 to O'OG ; branches 0^2 to 0'5. 



HaUtat. — AVestern Tropical Pacific, Station 224, deptli 1850 fathoms. 



9. Aulospathis furcata , n. sp. 



Eadial tubes without inflated terminal knob, with a \'ariable number of unequal terminal 

 branches, which are partly simple, partly irregularly forked or branched; the usual number 

 of terminal branches is three or four, more rarely two or five or six. Proximal whorl very irregular, 

 usually with four to six unequal, lateral branches. 



Dimensions. — Length of the tubes 2'0 to 2'5, breadth 0'03 to O'Oo ; branches 01 to 0'3. 



Halitat. — Stations 265 to 268, depth 2700 to 2900 fathoms. 



10. Aulospathis variabilis, u. sp. (PL 104, figs. 14-17). 



Eadial tubes without inflated terminal knob, with a variable number of unequal termiual 

 branches, which are constantly sunple, never forked ; the usual number is in the majority of the 

 tubes three or four, often also two, rarely five to eight. Proximal whorl irregular, with a \'ariable 

 number of lateral branches (usually four to six). 



Dimensions. — Length of the tubes 2-0 to 3'0, breadth O'OS to 0-06 ; branches 01 to 0'3. 



Habitat. — Central Pacific, Stations 271 to 274, depth 2350 to 2750 fathoms. 



Genus G70. Aulodendron,^ n. gen. 



Definition. — A u 1 a c a n t li i d a with a veil of tangential needles, and with radial 

 tiiljcs, which bear numerous, irreguhxrly scattered, lateral and terminal branches. 



* Avhderuhon = Tubular tree ; ai/Xo;, Itnoi^oy. 



