PYCNOGONIDA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 145 



March 1903. One of the males is carrying a large number of young. Some of these, 

 recently hatched, have a very stout, massive body bearing no resemblance to the structure 

 of the adult. The proboscis and chelifori are very distinct ; two pairs of small append- 

 ages lie behind these. They show a segmentation into joints. Half way between these 

 and the posterior extremity of the body-mass is another pair of appendages, stout 

 stumps with two segments indicated. The majority of the young, however, are much 

 larger. The proboscis and chelifori are well developed ; the two following pairs of limbs 

 are quite small, showing few segments and terminating in a long spine or claw. These 

 are obviously the palps and ovigers. Behind these are three pairs of well-developed 

 legs, and the body terminates in a rounded sac. The legs bear a few spinous setae and 

 more numerous finer ones. 



This species is unquestionably a very close relation of Pallenopsis pilosa, Hoek. 

 The spurs on the lateral processes and legs serve to separate it pretty sharply. Dr 

 HOEK'S species is a deep-water form. 



Nymphon longicoxa (Plate I., figs. 3, 3a). 

 Nymphon longicoxa, Hoek, (15), pp. 38-39. 



Specific Characters. Body and limbs very slender, lateral processes widely separated. 



Palps five-jointed. Proportion of three terminal joints as 4'5, 2, 3. 



Oviger ten-jointed. Denticulate spines numerous, eacli with three or four lateral 



teeth. 

 Legs long, slender, arid setose ; second coxa much longer than the other two together ; 



no auxiliary claws. 



Body very slender, and limbs long ; lateral processes very widely separated. 

 Segmentation distinct. 



The Cephalon is long, its segment just longer than the proboscis. Just behind its 

 centre it is enlarged to form the ventral support of the ovigers ; anteriorly to this it 

 forms a very slender neck, and is comparatively little expanded to form the lobes which 

 support the proboscis, chelifori, and palps. 



The Ocular tubercle is very short and stout ; it lies just between the first pair of lateral 

 processes and the enlargement that carries the ovigers. It bears four distinct eyes. 



The Abdomen is of moderate size, cylindrical, directed upwards, but not articulated 

 to the trunk. 



The length of the body is 8 - 5 mm. ; of the trunk only, 7 mm. ; and its width is 

 3 - 5 mm. It is entirely devoid of setse. 



The Proboscis is long, slender, scarcely as long as the cephalic segment ; it is 

 cylindrical, slightly swollen in the middle, and rather abruptly rounded distally. 



The Chelifori are long and slender ; the scape is single-jointed, longer than and over- 

 reaching the proboscis ; a few small setse are distributed along it, and there is a small 



(BOY. soc. EDIN. TRANS., VOL. XLVI., lor>.) 



