﻿ASTROrilYTON EUCNEMIS. 183 



two innermost pores, none at all ; outside the disk, on the chief stems 

 and branches, usually four scales at each pore. Color, in alcohol : dark 

 brown. 



Variations. — In smaller specimens the disk granulation is more dis- 

 tinct and better defined ; the radial ribs are very closely covered with 

 large, rounded, regular grains, which are larger than those of the 

 interbrachial spaces or of the U2:)per surface of the arms. A specimen 

 with a disk of 24™"'-, had arms with eight forks. A young one, hav- 

 ing a disk of 5.5"""-, had arms 17"""- long; distance from disk to first 

 fork, 4"""- ; first fork to second, 6"°- ; second to third, 5"""" ; third to end, 

 2""" . The back of the disk was covered with smooth, close-set, rounded 

 grains, whereof some were larger than others. The radial ribs were 

 faintly indicated, and only at their outer end. The upper surfiice of 

 the arms is covered with large grains also. Each mouth-angle carried 

 three or four stout, conical teeth, but there were no papillse on the 

 sides of the mouth-angle. The tentacle-scales were also very stout. 

 The sides of the arms bore no grains, but little, flattened spines, ar- 

 ranged in a row ; all of them, except those at the base of the arms, 

 bearing little hooks. A specimen with a disk of SS""' had the follow- 

 mg proportions of the arms : — 



First fork to second, jg"""- 



Second " " third 23 " 



Third '• " fourth, 24 " 



Fourth " " fifth, 24 " 



Fifth " " sixth, 21 " 



Sixth " '■ seventh, 16 " 



Seventh " " eighth, 18 " 



Eighth " " ninth 13 " 



Ninth " " tenth, 13 " 



Tenth " " eleventh, 9 " 



Eleventh " " end, 1 " 



174'""- 



This species has been dredged in four hundred and fifty fathoms, 

 and, according to Dewhurst, even as deep as one thousand fathoms. 

 It has been found on the coast of Greenland (Olric and HoUboll) and 

 at Newfoundland. A. eucnemis resembles A. Caryi, but the latter has 

 the space at the base of the mouth-angle distinctly granulated, as also 

 the edges of the genital slits ; the tentacle-scales, also, are shorter and 

 stouter. 



