264 Th. Mortensen. 



Solaster papposus Grieg. 1907. Report on the Second Norwegian 

 Arctic Expedition in the "Fram" 1898-1902. No. 13. 

 Echinodermata. p. 6. PI. I. Figs. 1 — 2. PI. II. 



Crossaster — Kalischewskij. 1907. Echinodermenfauna d. Sibi- 

 rischen Eismeeres, p. 30. 

 — — Koehler. 1909. Echinodermes. Monaco. Ease. 



XXXIV. p. 111. PI. II. Fig. 6. PI. IV. Figs. 4, 5. 



Solaster — Sussbach u. Breckner. 1910. Seeigel, Seesterne 

 u. Schlangensterne d. Nord- u. Ostsee, p. 223. 



Station 36. Danmarks Havn, 10 — 20 m. 1 specimen, 12 armed. 



— 63. Stormbugt — 



— 64. Cap Helgoland, 100 m. 



— 66. Stormbugt, 30 m. 



— 72. — — 



While it must be acknowledged that the form first distinguished 

 by Döderlein as Var. sqiiamatus is distinct enough and perhaps 

 entitled to specific rank, as is recently given to it by Grieg, I can- 

 not feel equally convinced of the value of the variety distinguished 

 by Grieg as the cold-water form, var. affinis (Brandt). One of the 

 more prominent differences is to be found in the number of the 

 paxillæ of the oral interbrachial spaces, they being numerous in 

 the cold-water form, few or quite wanting in the southern form, 

 though — it is agreed — they are sometimes numerous also in the 

 latter form. — The two larger of the specimens from the Dan- 

 mark Expedition, which ought to belong to the cold-water variety 

 according to the locality, have, however, the interbrachial spaces 

 nearly or quite naked. As none of the other distinguishing features 

 pointed out by Grieg seem to be more constant, it appears that 

 these varieties can scarcely be so distinct, as Grieg is inclined to 

 think. 



I may take the occasion here to state that all the specimens of 

 Solaster papposus from West Greenland, preserved in the Museum 

 of Copenhagen, belong to the typical form. — The relation between 

 S. papposus and squamatus is evidently the same as between S. endeca 

 and glacialis, the former being a boreal form of wide geographical 

 distribution, the latter a cold-water form, restricted to the cold region. 



Pedicellaster palæocrystallus Sladen. 



\n. XIV. Figs. 1, 9. PI. XV. Figs.l, 4, 7. 

 Pedicellaster palæocrystallus Duncan & Sladen. Mem. Echinoder- 

 mata of the Arctic Sea. p. 34. PI. II. 

 Figs. 22-26. 



