68 



As will be seen, these differences are very striking. Whether 

 specific characters can be found here, I dare not assert; I 

 have not on this occasion been able to take the other species of 

 the two groups into consideration. At any case these structures 

 deserve to be carefullv examined. 



Asteroidea. 



3. Asterias liilleri Sars. — PI. 11. Fig. 2. 



M. Sars: Norges Echinodermer. 1861. p. 88. — Danielssen&Koren: 

 Asteroidea. Norske Nordhavsexpedition. 1884. p. 21. — Levinsen: Kara- 

 havets Echinodermata. Dijmphnatogtets zoologisk-botaniske Udbytte. 1887. 

 p. 392. — F. Fischer: Echinoaermen von Jan Mayen, p. 31. (Die interna- 

 tionale Polarforsch ung 1882 — 83. Die Österreichische Polarstation Jan Mayen. 

 III. Bd.). — L. Döderlein: Die Echinodermen, in: Zoologische Ergebnisse 

 einer Untersuchungsfahrt des deutschen Seefischerei-Vereins nach der Bären- 

 insel und Westspitzbergen. Wiss. Meeresunters, herausg. v. d. Komm. z. Unters, 

 d. deutschen Meere in Kiel u. d. Biol Anst. auf Helgoland. N. F. IV. Abth. 

 Helgoland. H. 2. 1900. p. 202. — H. Ludvig: Arktische Seesterne. Fauna 

 arctica, herausg. v. F.Römer u. F. Schaudinn. Bd. 1. 3. p. 481. — Bell: Op. 

 cit. p. 100. 



Several specimens from Ingolfs Fjord (^/s 1899), Angmag- 

 sahk 9 — fathoms and off Henry Land, 20 fath. Those from the 

 latter locality must be referred to the var. floccosa Levinsen; the 

 larger specimens from Angmagsalik have very few and small 

 spines on the abactinal side and thus look remarkably naked; 

 also the form of the arms is uncommonly rounded. 



It is a very difficult task to distinguish between the species 

 A. Mülleri and A. groenlandica (Stp.). None of the characters, 

 when commonly used to separate the two species, holds good, 

 a large material is examined. The most important character is 

 found in the adambulacral spines, which form in A. groenlan- 

 dica a double series at least in a larger part of the arm, 

 whereas in A. Mülleri they are alternately single and double. 

 — On the larger specimens from Angmagsalik they are 

 disposed in a single series or alternately one and two, but on 

 most of them a double series is found on some part (4 — 6 



