REPORT ON THE ASTEROIDEA 597 



The actinostome is large and wide, its diameter being about 38 mm. in the specimen 

 described. The buccal membrane, which is of broad expanse, is thick and leathery, and is 

 marked with very fine radiating lines of low, crowded, villiform papillae. 



The madreporiform body is large and prominent, often slightly elevated above the 

 general surface of the disk, and is situated close to the margin. Its outline is irregularly 

 circular, 7"25 mm. in diameter, and is surrounded by a series of closely placed, small, 

 pointed spinelets, about forty-five in number. Its surface is marked with very fine, much 

 convoluted striations, which show a regular centrifugal radiation on the outer part. 



Colour in alcohol, a dirty ashy grey. 



Localities. — Station 149h. Off Cumberland Bay, Kerguelen Island. January 29, 

 1874. Depth 127 fathoms. Volcanic mud. 



Station 150. Between Kerguelen Island and Heard Island. February 2, 1874. Lat. 

 52° 4' 0" S., long. 71° 22' 0" E. Depth 150 fathoms. Coarse gravel. Bottom temperature 

 35 0, 2 Fahr. ; surface temperature 37°"5 Fahr. 



Station 151. Off Heard Island. February 7, 1874. Lat. 52° 59' 30" S., long. 73° 

 33' 30" E. Depth 75 fathoms. Volcanic mud. Surface temperature 36° "2 Fahr. 



Station 191. In the Arafura Sea, north-west of the Arrou Islands. September 23, 

 1874. Lat. 5° 41' 0" S.,long. 134° 4' 30" E. Depth 800 fathoms. Green mud. Bottom 

 temperature 39 c, 5 Fahr. ; surface temperature 82° - 2 Fahr. 



Remarks. — This species may be distinguished from its near ally, Labidiaster radiosus, 

 by the more numerous and comparatively more slender rays, by the uniformity in the size 

 of the spinelets on the disk and at the base of the rays, and by the tufts of forcipiform 

 pedicellarise upon the rays forming a thicker and more complete annulus. Although the 

 verbal account of these differences may lead to the inference that they are comparatively 

 insignificant, they produce a very distinct facies, as may be seen on referring to PI. 

 CVIII. I am unable to detect any difference worthy of note between a small example from 

 Station 191 and those from the neighbourhood of Kerguelen and Heard Islands. I have 

 previously drawn attention to the remarkable occurrence of Antarctic forms at this station. 



Genus Odinia, Perrier, 



Odinia, Perrier, Ann. Sci. Nat. (Zool.), 1885, t. xix. Art. No. '8, p. 9.] 



The establishment of Odinia as a genus distinct from Brisivga is due to M. 

 Perrier, who pointed out that the more highly developed plating of the disk and basal 

 portion of the rays, and the presence of papulae, which characterise the species he proposed 

 to separate, were structural details of sufficient importance to place the forms in a distinct 

 o-enus. With these views I concur, and judging from the form I have studied, I consider 

 that the shortness of the adambulacral plates, and probably the character of the mouth- 



