PYCNOGONIDA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 167 



pairs of legs ; those of the female on all the legs. One male is carrying ova ; these are 

 large, and few in number. 



I cannot find any reasonable ground for regarding this species as distinct from 

 N. longicoxa, Hoek. The principal differences seem to be the setose nature of the legs, 

 and the denticulate spines on the ovigers, which in Dr Hoek's specimens bear seven 

 lateral teeth. 



Several specimens were taken in lat. 71° 22' S., long. 16° 34' W., in 1410 fathoms, 

 18th March 1904. 



Nymphon compactum (Plate I., figs. 5, 5a). 

 Nymphon compactum, Hoek, (15), pj>. 41-43. 



Specific Characters. — Body stout, sparsely hairy ; eyes obsolete. 



Palps five-jointed; proportions of last three, 5, 2*5, 2'5. 



Oviger ten -join ted ; denticulate spines numerous, with four to six lateral teeth. 



Legs long ; auxiliary claws absent. 



Body stout, with the lateral processes short and not widely though very distinctly 

 separated. The cephalon is short, much widened anteriorly to form two well-marked 

 and divergent lobes for the support of the chelifori. The neck is very distinct, 

 narrowest just behind the cephalic lobes ; the space between these and the first pair of 

 lateral processes is completely filled by the body-process from which the ovigers arise. 

 This body-process is conspicuous from the dorsal aspect. 



The Ocular tubercle lies immediately in front of the first pair of lateral processes ; 

 it is stout, of very small elevation, and bears no trace of eyes. 



The Abdomen is pyriform, a little longer than the cephalon ; it is not articulated to 

 the trunk. 



The segmentation is not at all prominent, the articulations being immediately 

 behind the lateral processes. 



The length of the body is 9\5 mm., of the trunk, 7 mm. ; and its width is 5 mm. 



The Proboscis is directed downwards, cylindrical, and measured ventrally it just 

 exceeds 4 mm. 



The Chelifori are well developed. The scape is single-jointed and extends just 

 beyond the end of the proboscis. It bears a number of fine long setse arranged in an 

 irregular linear manner, and also forming a fairly well-defined distal fringe. The chela is 

 long and narrow, the palm being shorter than the slender fingers ; the palm is covered 

 with fine setae nearly half way along the immovable finger, and there is a fringe of 

 stout setse at the base of the movable one. The fingers are, as usual, much incurved at 

 the tips, and provided with very numerous, close-set, slender teeth, not very irregular 

 in length. Those of the movable finger are the larger. 



The Palps arise close to the chelifori and are of the normal five joints. The first 



TRANS. ROY. SOC. EDIN, VOL. XLVI. PART I. (NO. 6). 23 



