Report on the Echinoderms of North-East Greenland. 243 



well-founded opinion of the specific value of the different characters, 

 I sent the material to Dr. A. H. Clark, Washington, the eminent 

 specialist on recent Crinoids, asking his opinion of the matter. He 

 most kindly informed me that after a very careful study he had 

 come to the result that all the specimens were true H. prolixa, the 

 characters of the pinnule joints and the "adambulacral" plates being 

 not accompanied by other distinguishing features and thus insufficient 

 for founding upon them a separate species. — Though I do not, of 

 course, in any way doubt the correctness of this result, I would 

 suggest that it might be adventageous to take account of which 

 type of "adambulacral" plates is found in the specimens under 

 examination of this species. 



A curious abnormality was found in one specimen, viz. a dichoto- 

 mously branched pinnule (PI. XII. Figs. 1, 7); the dichotomy takes 

 place at the third joint. 



The species was figured by Duncan & Sladen (Op. cit. PI. VI. 

 Fig. 7), but evidently from a rather poor specimen, and the figure 

 itself is not very elaborate. Recently Koehler (Op. cit.) has given 

 a figure of a specimen without arms, but with the cirri well pre- 

 served. A good representation of the species has, however, not been 

 given as yet. Accordingly I have thought it desirable to give here 

 photographic figures of a pair of the best specimens in hand (PI. VIII.). 

 They show very well the excessive length of the outer cirri. In the 

 specimen figured from the oral side the hydropores are distinct; 

 they are, however, too small to show in the figure. They are 

 disposed in a rather broad belt in each interambulacral space, 

 along the ambulacral furrow, though somewhat distant from it in 

 the inner part. In the specimen figured (PI. VIII., Fig. 2) I counted 

 ca. 90 pores in each interbrachial space. 



The colour of the living specimens is thus described by Mr. 

 Fr. Johansen, the Zoologist of the Expedition: "Pinnulæ, with the 

 genital organs, yellow red; arms brown-yellow, disk ("anal area") 

 light brown, cirri white". 



All the specimens were carefully examined for Myzostoma, the 

 result being that in one specimen one was found in the mouth of 

 the host, while in another specimen two Myzostoma occurred, one 

 on the disk, the other at the base of one of the arms, close to the 

 ambulacral furrow. In the rest of the specimens no Myzostoma were 

 found. — Probably they belong to the species Myzostoma Carpenteri 

 V. GratT, hitherto known from the nearly related species Hathromeira 

 ienella (Retz.) and dentata (Say). The largest of the three specimens 

 is only 06 mm long, while M. Carpenteri otherwise reaches a size 

 of more than 4mni length (425 mm, according to F.Nansen: Bidrag 



