81 



to find a specimen varying in this respect, and one might sup- 

 pose this specimen to belong to another species. I cannot, 

 however, find one single other character of any importance, by 

 which it may be distinguished from the specimens with two 

 adambulacral spines. — In the figure given by SI ad en (Op. 

 cit. PJ. LXXX. 5) there is only one pair of secondary mouthspi- 

 nes, and Danielssen & Koren have seen and figured none 

 at all; now there are two pairs of secondary mouthspines in this 

 specimen. This would be an excellent character, if the state- 

 ments of S laden and Da nielssen& Koren were to be relied 

 upon. I find, however, that also specimens with two adambula- 

 cral spines have regularly two pairs of secondary mouthspines. 

 To found a new species on account of the three adambulacral 

 spines alone would be rather absurd, to my opinion ; I prefer, 

 at any rate till more material has been procured, to regard it 

 as a variety of H. pellucidus. 



15. Pentagonaster granularis (Retzius). 



Sars: Op. cit. p. 46. — Lütken: Kritiske Bemærkninger om forskellige 

 Søstjærner (Asterider) med Beskrivelse af nogle nye Arter. Vidensk. Medd. 

 Naturh. Foren. Københ. 1864. p. 146. — Bell: Op. cit. p. 73. — Ludwig: 

 Op. cit. p. 456. 



Angmagsalik, 140 fathoms, 1 specimen {К = 15 mm., г = 

 5,5 mm. 



The arms are very distinctly marked off; the margin of 

 the disc between the arms quite straight. The marginal plates 

 with an uncommonly small naked, oval spot near the upper (or 

 lower) margin. Most of the upper marginal plates have not, as 

 is commonly the case in P. granularis, a series of small grains 

 along the upper margin, but the abactinal plates are directly 

 in contact with the marginal plates. There are 12 dorsal and 

 14 ventral marginal plates, the last of the ventral ones being 

 very small. The two distal pairs of dorsal marginal plates are 

 in contact in the median line on the abactinal side of the arm; 

 but, whereas there is in the typical P. granularis a series of 



