PYCNOGONIDA. 25 



The Legs are not very long, extending to nearly 11mm. from the trunk. Of the 

 three coxse, the second is as long as the other two together, the first being by a little the 

 smallest ; the proportions of the remaining joints being 4:5:6:075:2. The terminal 

 claw is large and stout, with two well-developed auxiliaries. The lateral line is distinct 

 throughout. The setae have a rather indistinct linear arrangement, those on the 

 sides of the coxse are prominent, especially on the second"; on the third they are more 

 confined to the ventral surface, and the distal fringe is fairly well developed. On the 

 femur the setae are long and straggling, chiefly lateral, and ventrally there is a row of 

 small tubercles. On the two tibiae, but more especially the second, the setae are most 

 abundant, largest on the first. Ventrally they are much smaller, the distal fringe of 

 the second tibia becoming spinous. The tarsus is a very short joint with long setae 

 dorsally, smaller and more numerous ones ventrally, which become delicate spines 

 distally. The propodus is covered with setae dorsally, and ventrally there is a row of 

 rather strong spines, and of these the middle ones are strongest. 



The single specimen is a male, carrying young, apparently just hatched. The 

 Genital apertures are to be found on the second coxae of the two posterior pairs 

 of legs. 



From the root of a Laminarian taken in 17 fm., Cape Adare, 24th February, 1904. 



Nymphon frigidum. 



(Plate III, fig. 4 ; Plate X., fig. 10.) 



Specific characters : — 



Body very slender, with lateral processes long and very widely separated. 

 Ocular tubercle very short, stout. 

 Palps five-jointed, proportions of last three 3 : 1-5 : 3. 



Oviger ten-jointed, denticulate spines not very numerous, with five to seven lateral teeth. 

 Legs long and slender, propodus with ventral row of spines, a large terminal claw and two 

 auxiliaries. 



Body well built, perfectly smooth, with the lateral processes widely separated and 

 rather long, much more slender than the trunk. 



The Cephalon is rather long, with a distinct neck and expanded anteriorly into 

 the two normal lobes. 



The Abdomen is short, directed obliquely upwards, and not projecting beyond 

 the posterior pair of lateral processes. 



The Ocular tubercle is stout, very short, and bears four well-developed eyes. 



The length of the body is 2mm., and its extreme width is 1 • 2mm. 



The Proboscis is cylindrical, directed downwards. 



The Chelifori comprise a single-jointed scape, slender, and covered with a small 

 number of fine setae. The chelae are well developed, the palms being about half their 

 length, and setose ; the fingers are not much curved, provided with a number of teeth, 

 not very closely set, and of uniform size. 



The Palp is five-jointed and rises underneath the chelifori (fig. 4a). The first 



V 2 



