74 NATURAL HISTORY OF KERGUELEN ISLAND. 



and below the border of the mouth slits. The mouth-papillae consist ot 

 two small, conical, pointed ones at the angle of the jaw, below the teeth, 

 and of an irregular row of two to four smaller ones on each side, run- 

 ning outward and downward below the proximal papillae of the upper 

 oral tentacle. Teeth, seven to nine on each jaw, stout, obtuse, the 

 series often double in the middle. Mouth-shields broad, spade-shaped, 

 the broad proximal portion terminating in an obtuse point, the some- 

 what narrowed distal portion extending outward in the interradial 

 spaces about half the total length and broadly rounded at the end. 

 Side mouth-shields long and narrow, somewhat enlarged at the ends, 

 narrower in the middle. The oral tentacles are very large in the 

 alcoholic specimens, projecting inward beyond the ends of the mouth- 

 slits, and nearly filling them up ; they are divided into a series of lobes 

 by transverse constrictions. 



Color of alcoholic specimens very dark slate-brown above ; yellowish 

 brown beneath. 



One of the larger specimens measures, across the disk, 18™°^ ; length 

 of arms from dorsal notch, about 35™™ (tips broken off ); diameter at 

 base, without spines, 2.25™™ ; length of spines, 1™™. 



Kerguelen Island, five fathoms j Dr. J. H. Kidder. 



This species differs widely from all the previously described species of 

 OpMoglypha, in having six arms, in the shallow notches at the bases of 

 the arms, and in the characters of the mouth-papillai and mouth-shields, 

 but in size and general appearance it somewhat resembles some vari- 

 eties of 0. sarsii of the North Atlantic. In several respects it is re- 

 lated to Ophiocten, but though the surface of the disk is covered with a 

 thin, rough skin, it is not distinctly granulated. Although it would not 

 properly go into either of these two genera, as they are ordinarily- 

 defined, it seems most natural to refer it to OpMoglypha, which may 

 easily be emended in respect to some of the characters ihat may now be 

 regarded as merely specific. ^ 



AsTROPHYTON AUSTRALE, VerriU, s. n. 



Disk unevenly granulous, with ten prominent radiating ribs, starting 

 near the center and extending to the lateral bases of the armsj they 

 are broadest and highest near the outer end, which is gently sloped 

 and evenly rounded. The ribs bear four to ten or more unequal. 



