Report on the Echinoderms of North-East Greenland. 249 



edge of the calyx; also the anal plate is distinct as yet (PI. XI, Fig. 6). 

 Hydropores 1 have been unable to observe in the orals in this or 

 any of the preceding stages. The armjoints (PI. XII, Fig. 4) are in 

 accordance with the description given by Sars of those o£ H. Sarsii 

 in the corresponding stage (Op. cit. p. 50); side plates are developed; 

 they are somewhat more branched than those found in the pinnules 

 of the adult. 



The next stages, showing the development of the pinnulæ and 

 cirri and the transformation of the calyx, are unfortunately not 

 found in the material at hand. 



Through the kindness of Mr. J. Grieg I have had for inspec- 

 tion a preparation of some Pentacrinoids of H. tenella, which 

 species is regarded by Grieg as synonymous with H. Sarsii (Echi- 

 noderms v. Michael Sars, И, Crinoidea, p. 20). While I do not 

 see any distinct differences of undoubted specific value in the 

 calyx, the stalk-joints differ conspicuously from those of H. pro- 

 lixa, being distinctlj^ hourglass-shaped and much more robust, as 

 is seen by comparing figs. 4 and 7 of PI. XI, both being equalh"^ 

 magnified. 



A Pentacrinoid of Hathrometra dentata has been figured by 

 Verrill (Results of the Explorations made by the Steamer Alba- 

 tross off the Northern Coast of the U. S. in 1883. Ann. Rep. 

 Comm. of Fish and Fisheries, Washington 1885, PI. XXI, Fig. 58). 

 It is in the stage III, slightly older than the specimen of H. pro- 

 lixa figured here (PI. X, 2 and IX, 5). The figure is not sufficiently 

 detailed for enabling one to ascertain bj^ which characters it is to 

 be distinguished from the Pentacrinoids of the other Hathrometra- 

 species. 



The Pentacrinoid of H. glacialis (A. Eschrichtii) was described 

 and figured by Levinsen (Kara-Havets Echinodermata. Dijmphna- 

 Togtets zool. bot. Udbytte, 1886, p. 414 (sep. 34), PI. XXXV, Fig. 8), 

 viz. a specimen in the Stage V, with the first pinnulæ and cirri 

 developed. As this figure, like that of H. dcntaia, is also too little 

 •detailed, I wished to study the original specimen somewhat more 

 closely in comparison with the Pentacrinoids of H. prolixa. But 

 unfortunately the specimen appears to have been lost. Having 

 learned, however, that a Pentacrinoid of H. glacialis was preserved 

 in the Zoological Institute of Uppsala and another in the Stockholm 

 Museum, I applied to Professors Wiren and Théel, asking to have 

 these specimens for examination, and with the greatest liberality, 

 for which I beg here to tender my sincerest thanks, both the valu- 

 able specimens were sent to me. Both specimens are from Spits- 

 bergen. 



