4 DR P. P. C. HOEK ON THE 



Wilson also). I therefore retain the name of Fabricius for Kroyer's species, 

 the first that has been described recognisable under that name, and I give to 

 the other the name of Bell, whose figures and description doubtless refer to it. 

 Although this species is common in high northern latitudes (Bell, Miers, 

 Hoek), it seems to be rather scarce in the North Atlantic (Professor G. O. Sars 

 only observed it once ; it was not obtained by the " Knight Errant"; and the 

 " Triton " collected only one specimen). Off Halifax it was taken in great num- 

 bers by the U.S. Fish Commission in 1877 (Wilson). 



3. Nymphon Stromii, Kroyer. 



During the cruise of H.M.S. "Triton" this species was met with on three 

 different occasions. At Station 9 about forty specimens of it were taken ; 

 at Station 8, three, aud at Station 6, one specimen. It was not observed at 

 one of the stations of the warm area, as happened during the cruise of the 

 "Knight Errant." 



4. Nymphon macronyx, G. O. Sars. 



This species was first observed by Professor Sars during the first cruise of 

 the " Voringen" (1876); it was again collected in the Faroe Channel during the 

 summer of 1880 ("Knight Errant") ; and it is now dredged for the third time 

 by H.M.S. "Triton." Professor Sars collected four specimens; the "Knight 

 Errant " took about thirty specimens ; and the " Triton " several hundreds. 

 These specimens were obtained in about lat. 60° north, whereas Sars got his 

 specimens at 62° 44' 5". Whether its distribution will be found to extend still 

 further north, I cannot say with certainty. I only think it very probable, as 

 this species is an inhabitant of the cold area. 



At Station 8, several hundred specimens of this species were taken, 

 „ 9, about fifty specimens „ „ 



w 6, „ two „ „ „ 



and one specimen (see p. 1) was found in the bottle containing the Pycno- 

 gonids from Station 10. 



One of the specimens of Station 8 has no eyes ; or, better perhaps, has no 

 pigment in its eyes. 



."). Nymphon macrum, Wilson. 



Wilson, Pycnogonida of New England, Report U.S. Commission of Fish and Fisheries, vi. 



(1878), 1881, p. 487, pi. iv., figs. 21-23. 

 Syn. Nymphon brevicollnm, Hoek, Report "Challenger" Pycnogonida, 1881, p. 45, pi. iii. 



figs. 13-15; pis. xv. figs. 12 and 13. 



The general appearance of this species is much like N. Stromii. When 

 studying the details as to the length of the joints of the palpi, of the tarsal joints 



