10 
caty der K.K. Oest- Ung. Nordpol-Expedition. Denkschr. der Math. 
naturw. Classe der Kaiserl. Akad. der Wissensch. XXXV.p. 40. 1875. 
Nymphon strömii, Kr., Miers, Ann. and Mag. 4th Series Vol. 
XX. p. 109. 1877. 
Nymphon graeilipes, Heller, G. O. Sars, Prodromus descriptionis 
Crustaceorum et Pyenogonidarum, quae in expeditione Norvegica 
anno 1876 observavit. Arch. for Math. og Naturvid. II. p. 265. 1877. 
Nymphon strömii, Kr., Wilson, Pyenogonida of New England, 
Transact. Connecticut Academy Vol. V. p. 17. Plate VI. Fig. 1La— 
1h. 1880. 
Plate I. fig. 9—16. 
A large quantity of this very interesting Pyenogonid has been 
dredged in different places of the Barents Sea. No doubt this spe- 
cies is one of the better known of the genus Nymphon; already 
in 1845 Kröyer published a good description of it; Heller did the 
same in 1875, thinking the animal he described as N. gracilipes 
to be a new species. Wilson recently published (March 1880) again 
a description of this species, illustrated with numerous figures. 
It is the last author, who points out the identity of the N. 
gracilipes, Heller with the N. strömii, Kr. Heller himself says 
(l.c. p. 41) that his N. gracilipes is closely allied to the N. strömii of 
Kröyer; the only difference he mentions being that the claw of N. 
strömii is (after Kröyer) only one third the length of the second 
tarsal joint, whereas the length. of this claw in his N. gracilipes 
is at least half the length of that joint. 
Now this is, I believe, not a very important difference. I have 
before me about 40 specimens of this species, and between these 
a considerable variety in the length of the claw is to be observed. 
To illustrate this I figured in Fig. 9 Plate 1. of one and the 
same specimen in a the tarsal-joints of the first leg of the right- 
side, in b those of the same leg of the left-side: the former showing 
the claw not half as long as the second tarsal joint, in the latter 
it being almost as long as that tarsal joint. 
In his diagnosis of this species Heller says “unguiculi auxilia- 
res nulli,” and this would be a difference of a much greater value. 
