Report on the Echinoderms of North-East Greenland. 269 



the point; there are generally some more thorns than in the dorsal 

 spines. In the PI. II. Fig. 16 of Duncan & Sladen the adambula- 

 cral spines are represented somewhat too slender. (Tliis figure also 

 shows only two series of tubefeet, a rather conspicuous inaccuracy). 



In the larger specimens I find the straight pedicellariæ generally 

 arranged in a continuous, close series inside the adami>ulacral 

 spines, not "at intervals of every two or three adambulacral plates", 

 as stated by Duncan & Sladen (p. 30). The description and 

 figure of these pedicellariæ given by Da nie Issen & Koren (Op. 

 cit. p. 34. PI. VIII. Fig. 14) I find not very correct; especially it may 

 be noticed that the "rostelformed extremity" in which they are said 

 to end, is by no means a constant feature; I have, upon the whole, 

 not observed such as resembled the said figure very closely. Gene- 

 rally I find them as figured in PI. XVII. Fig. 12. But these pedicel- 

 lariæ are, as is generally the case in Asteroids, very little specialized 

 and inconstant as regards teeth and other prominences, in marked 

 contrast to the cruciform pedicellariæ ( — not to speak of the pedicel- 

 lariæ of Echinoids). 



The cruciform pedicellariæ (PI. XV. Figs.8— 10) differ so markedly 

 from the description and figure given by D an ie Issen & Koren 

 (Op. cit. p. 33. PI. VIII. Fig. 13), that one cannot help thinking that 

 it is not at all the cruciform pedicellariæ of this species they are 

 describing. I am not going to try to find out what it really is, but 

 hope to have shown sufficiently by the figures given here that it 

 cannot be the cruciform pedicellariæ of Stichaster albulus. A detailed 

 description of these structures seems to me superfluous; it is, in 

 fact, a quite common form, resembling those of several species of 

 Asterias. 



Some specimens from Stat. 70 have a somewhat peculiar appear- 

 ance on account of the skin covering the pedicellariæ on the 

 dorsal side being dark coloured on the top, the line along which 

 the pedicellaria opens remaining uncoloured, so that each pedi- 

 cellaria appears as a small brow^iish knob with a white line across. 

 At first sight one is tempted to think this is another species, 

 but a close examination shows the structure of the pedicellariæ to 

 be exactly as in the other specimens, and as no other differences 

 appear to exist, these specimens must evidently be referred to St. 

 albulus. 



The colour of this species is stated by Mr. Fr. Johansen to 

 be faint yellowish, transparent, as is also shown by a coloured 

 sketch, which he has made from a living young specimen. This 

 statement is contradictory to that of Lût ken (Grønlands Echino- 

 dermata, p. 30), according to which the colour of this species is pink. 



XLV. 19 



