6 
Nymphon hirtipes, Bell, Belcher’s Last of the Arctic Voyages 
Vol. I. p. 408. 1855. 
Nymphon hirtum, Fabr., Sars, Prodromus Crustaceorum et Pyc- 
nogonidarun ete. Arch. for Math. og Naturvid. II. 1877 P. 265. 
Nymphon hirtipes, Bell, Wilson, Pyenogonida of New England, 
Transactions Connect. Academy of Arts and Sciences Vol. V. p. 
22. 1880. 
Plate. I. fig. 1—8. 
In his Entomologia Systematica Joh. Chr. Fabrieius in 1794 
published the following description of his Nymphon hirtum. „Nym- 
phon corpore filiformi hirto. habitat in oceano Norwagico. Statura 
et magnitudine praecedenti (grossipedi) simillimum. Corpus omnino 
lineare undique hirtum. Pedes elongati, hirti attamen breviores 
quam in praecedente.” 
In 1845 Kröyer deseribed under the same name a Nymphon-spe- 
cies, which he believes identical with the species observed by Fa- 
brieius. A careful diagnosis of this species is given: it is almost 
impossible to confound this form with any other. 
In 1855 Bell described a species under the name of N.hirtipes, 
which he believes to be distinet from the N. hirtum, Fabr. 
This same species was enumerated in 1877 by G. O. Sars, but 
as he believes this species identical with the N. hirtum Fabr., 
he gives it that name and not the name proposed by Bell, adding 
for this species “vix Nymphon hirtum, Kröyer.’ 
I quite agree with G. O. Sars, that the present species and the 
one described by Kröyer are two different ones. Yet I believe, that 
when this is the case, there can be no doubt but the species of 
Kröyer must bear the name of Fabricius, the other one that of 
Bell; the definition of Fabricius is applicable to both species, 
perhaps also to a third and fourth species ; therefore I retain it 
for the first species described recognizable under that name, which 
is without question the species described by Kröyer. 
Nymphon hirtum, Fabr., (Kröyer) differs from N. hirtipes, Bell 
in the length of the movable claw of the mandibles; but taking the 
latter species so as it has been recently described by Wilson, the 
er 
