MUSEUM OF COMPARATIVE ZOOLOGY. 67 



Description of an Individual (Station 170). — Diameter of disk 8.5 mm. 

 Length of arm 85 mm. Width of arm near disk 3 mm. Height of arm 

 2.4 mm. Mouth-angles covered with minute, close, smooth granulation, and 

 bearing at their apex the usual wide spear-head shaped teeth. Arms wide 

 next disk, tapering rapidly for about 15 mm , and thence very gradually to 

 their tips; covered by a fine, even, smooth, close-set granulation, 7 or 8 

 grains in the length of 1 mm. The skin, being thin, allows the outlines of the 

 joints to show through, especially near the ends. Disk flat, scarcely rising 

 above arms, and with a similar granulation, though rather looser on the 

 upper surface. Radial shields scarcely to be distinguished, except at their 

 outer ends. The first pair of pores outside mouth-slit has no scale ; the next 

 «ix have only one; those beyond two, whereof the inner and larger is cylin- 

 dri'ial, with a somewhat swollen, rough end, and attains, about two thirds out 

 on arm, a length of 1.3 mm. At the tip, the lower scale takes on the form of a 

 flattened compound hook, with four curved teeth on its edge. Color in alcohol, 

 very pale brown. 



Station 170, 520-630 fathoms, 1 specimen. 



Astrosehema brachiatum sp nov. 



Plate XVII. Figs. 468-465. 



Special Maries. — Arms twenty-four times the diameter of the disk, higher 

 than wide, with a smooth, even granulation, 6 to 9 grains in the length of 

 1 mm. 



Description of an Individual (Station 33). — Diameter of disk 11 mm. 

 Length of arm 270 mm. Width of arm near disk 3 mm. Height of arm at 

 same point 3.8 mm. The granulation of the disk is, as usual, projected over 

 the mouth-angles, but there are no conspicuous grains which simulate mouth- 

 papillae. Teeth short, blunt, peg-like spines. Arms long, smooth, higher than 

 wide, cleanly arched, and with only faint joint-ridges ; they are closely and 

 uniformly covered with a smooth granulation, 6 to 9 grains in the length of 1 

 mm. Disk high and arched, with well marked, somewhat elevated radial ribs, 

 running nearly to the centre. The granulation is about as on the arms. Geni- 

 tal openings rather short ; their upper ends not reaching the level of the top of 

 the arm. No tentacle-scales (spines) on first pair of pores outside mouth-slit ; 

 the next two pairs have one scale, and those beyond two, of which the lower 

 one attains a maximimi length of 2 mm., and has a rough, slightly clubbed end. 

 Color in alcohol uniform chocolate-brown. 



Station 33, 435 fathoms, 1 specimen. 



This species stands between A. tenue and A. Iceve ; its arms are much thicker 

 than those of the former, and much longer than those of the latter. 



