MUSEUM OF COMPAllATIVE ZOOLOGY. 69 



of 1 mm. Disk thick, but flat on top, and rising but little above arms, covered 

 by a thin skin, which is finely, closely and evenly granulated. The radial 

 shields are faintly indicated by fiat ridges running to the centre. Mouth-tenta- 

 cles enclosed in tubes ; the next have no scale ; the next three or lour have 

 but one ; those beyond, two, which at first are small and spiniform, and are 

 nowhere long, the lower one attaining a maximum length of 1.4 mm. with a 

 cylindrical form, and a rough scarcely swollen end. Color in alcohol, brown- 

 ish red, approaching flesh-color. 



Station 310, 400 fathoms, 4 specimens on a Gorgonian near Brandelld. 



By its color and smooth surface O. ruhrum may easily be mistaken for an 

 Ophiocreas. 



ASTEOCLON* gen. nov. 



Arms beginning to branch at a considerable distance from the disk, and 

 having but few forks, nearly as in Trichaster, Disk rising well above the 

 arms, and granulated, as are the latter. The tips of the twigs are encircled at 

 each joint by a double belt of hook-bearing grains. Along the under surface 

 of the base of the arm are two longitudinal lines of large, transverse slits, a 

 pair to each joint, from which issue short tentacles; and above these on either 

 side is a row of peg-like tentacle-scales. Mouth-angles naked on their sides, 

 but with a bunch of spine-like papillae at the apex. Two very large genital 

 openings in each interbrachial space. 



Astroclon propugnatoris t sp. nov. 



Plate XVIII. Figs. 481 - 486. 



Special Marks. — Animal covered above by a closely soldered granulation, 

 in which appear numerous dark patches, which are small, oblong, smooth 

 plates, sometimes raised like tubercles, and sometimes sunken. Below, the 

 granulation is microscopic, and, on part of the under surface of arm, wanting. 

 Five short, wide, smooth tentacle-scales. 



Description of an Individual (Station 192). — Diameter of disk 65 mm. 

 Length of arm : from disk to 1st fork, 160 mm. ; from 1st fork to 2d, 36 mm. ; 

 2d to 3d, 137 mm. ; 3d to 4th, 26 mm. ; 4th to 5th, 16 mm. ; 5th to 6th, 16 mm. ; 

 6th to end, 16 mm.; total, 407 mm. Width of arm near disk 14 mm. ; height 

 at same point 10 mm. Mouth-angles small, and on their sides smooth, bearing 



* darripy star ; K\(iv, twig. 



t Dr. Carpenter has happily translated " Challenger" by trpSfiaxos, the Homeric 

 word for a champion who stood in front of the line of battle and challeiiged the 

 leaders of the enemy. Propugnator is a verbal translation, although it seems usually 

 to signify rather a defender. I am told by high authority, however, that its 

 present use is allowable. Goliath was such a challenging champion, but he is de- 

 scribed in the Vulgate as vir spurius, an expression not applicable here. 



