44 THE VOYAGE OF H.M.S. CHALLENGER. 



from Kerguelen ; yet the two species may easily be distinguished from each other 

 by the form of the oculiferous tubercle, by the length of the claws of the mandiljles, 

 and by the length of the legs, which are in Nymplwn gracilijyes, Miers (after Bohm), 

 five times as long as the body. It is remarkable that this species living at a depth 

 of 1675 fathoms should have normally developed eyes. 



Nymphon cjrossipes, 0th. Fabr. sp. (PI. III. figs. 9-12 ; PI. IV. fig. 1).^ 



Pijcnogonurii grompes, Oth. Fabr., Fauna Grcenlandica, p. 229, 1780. 



Nymphon r/mssipes, Oth. Fabr., Kroycr, Bidrag til Kundskab, Naturh. Tidskr. N. E., vol. i. 

 p. 108, 1845. 



Nymphon grossipes, Oth. Fabr., Wilson, Pycnogonida of Now England, Transactions Con- 

 necticut Acad., vol. V. p. 21, 1880. 



Description. — The body of this species is slender and almost smooth, the lateral 

 processes are widely separated, with the exception of the small lateral processes of the 

 ovigerous legs, and those of the first pair of true legs, between which no interval is 

 observed. The proboscis is not very long, cylindrical, a little swollen at the extremity. 

 The ccplialothoracic segment is longer than the rostrum, swollen considerably at the base 

 of the mandibles. The abdomen is small. The oculiferous tubercle is very prominent, 

 conical, acute. The eyes are four, large (PI. IV. fig. 1). 



The mandibles have a long basal joint, which is longer than the j^roboscis and narrower ; 

 the second joint is not very long ; the claws are short, not very hairy, but armed with 

 numerous equi-distant spines (PI. III. fig. 10). The two mandibles are, in the three 

 specimens procured, strongly divergent. The palpi are not very slender, nearly one-half 

 as long as the proboscis, with the second joint not quite as long as the third, and the fifth 

 longer than the fourth, furnished with numerous hairs at the end of the thii'd joint, on 

 the fourth, and on the fifth joint. 



The ovigerous legs of the males (PI. III. fig. 9) are long, more than one-half longer 

 than the body, the fourth joint is the longest, the fifth nearly as long, all the joints are 

 covered with very small perpendicular hairs. The spines of the four last joints are small, 

 but numerous and elongated, sharply serrated (PL III. fig. 11). The claw is small, with 

 numerous thin spines. 



The ovigerous legs of the female are much shorter ; 8 mm. in a female of 7 mm. 

 The relative length of the joints is the same as in the male. The hairs are much smaller. 

 The numbers of the denticulated spines on the four last joints are respectively 18, 17, 16, 

 14. There are about sixteen very slender and pointed spines at the claw. 



The legs are long and slender, nearly five times as long as the body ; a male of 8 mm. 

 has legs of 38 mm. The joints are sparsely hairy, with a row of stronger hairs at the 

 junction of two joints ; the second joint is twice as long as the first ; the sixth joint 

 is by far the longest. The first tarsal joint is longer than the second, which is armed with 



» The figures on Plate III. and IV. belonging to this species are marked, JV. annatum, n. 



.SP. 



