242 



Th. Mortensen. 



Heliometra glacialis (Leach). A. H. Clark. 1909. On a collection of 

 Crinoids from the Zoological museum of Copen- 

 hagen. Vid. Medd. Nat. Foren, p. 188. 

 Station 63. Stormbugt; 18 — 37 m. 1 badly preserved specimen. 

 — 99. (77° N. 18^/3° W.) 304 - 1 — — ' — 



Some notes on the Pentacrinoid of this species, with a figure 

 (Pl.X. 1) are given on p. 349— 350. 



2. Hathrometra prolixa (Sladen). 

 PI. VIII.— IX. PI. X. Fig. 2. PI. XI. Fius. 1-6. PI. XII. Fiss. 1 



-5,7. 



Antedon prolixa Sladen. 1881. Memoir Ech. Arctic Sea. p. 77. 

 PI. VI. Figs. 7— 10. 



— — Michailovskij. 1903. Echinodermen. Spitzbergen. 



p. 42, 76. 



— — Th. Mortensen. 1903. Echinoderms from East 



Greenland, p. 65. PI. I. Figs. 1 — 3. 



— — Grieg. 1903. Echinodermen v. "Michael Sars". 



Crinoidea. p. 20. 



— — Döderlein. 1905. Arktische Crinoiden. Fauna 



Arct. IV. p. 401. 

 — R. К о e h 1 e r. 1909. Campagnes scientif. Monaco. Ease. 

 XXXIV. Échinodermes. p. 270. PI. XXXII, Fig. 11. 

 Hathrometra prolixa A.H.Clark. 1908. New genera of unstalked Cri- 

 noids. Proc. Biol. Soc. Washington. XXI. p. 130. 

 Station 99. (77°N. 18V/3° W^.) 304 m (22. VII. 1908). Several specimens, 

 some of them excellently preserved. 

 — 104. (76°6'N. 13°26'W.) 200—250 m. (Clay with some gravel 

 and shells). 3 poorly preserved specimens. 



In the "Echinoderms from East Greenland" the 

 terminal joints of the pinnulæ of this species are 

 described and figured (PI. I. 2) as smooth and 

 cylindrical. In some of the present specimens they 

 are, however, somewhat thorny. The "adambulacral" 

 plates are figured as slender, smooth rods, with a 

 small terminal widening; in the specimens from Stat. 

 104 they are of the same shape, but in all the speci- 

 mens from Stat. 99 they are more or less thorny, 

 without the terminal widening (Fig. 1). Being some- 

 what in doubt whether these specimens were really 

 identical with those described in the paper quoted, 

 and as I had not sufficient material for a more 

 detailed comparative study of the different species of 

 the genus Hathrometra so as to be able to form a 



Fig. 1. "Adam- 

 bulacral" plates of 

 Hathrometra pro- 

 lixa. ""/1. 



