PYCNOGONIDA. 47 



The Chelifori are rudimentary and comprise a stout scape of one joint, which 

 is slightly curved ; except for a distal fringe which is not conspicuous, the joint 

 is not setose. The chelae in the adult are only represented by knobs, and these 

 show the merest traces of two fingers. In younger specimens the chelae arc developed 

 and exhibit comparatively long curved fingers devoid of teeth. 



The Palps are nine-jointed and arise at the side of the proboscis. The first joint 

 is short and stout, the proportions of the three following are as 5 : 1 : 4 ; the remaining 

 five are all short and difi'er little in size, the first and third are sub-equal, the 

 second and terminal are very little shorter but also sub-equal, the penultimate is the 

 shortest ; the last joint is ovoid in shape, setose throughout, the setae more thickly 

 distributed on its inner margin. The other four joints have slender bases and are 

 much enlarged and densely setose on the inner margin ; the outer margin is straight 

 and bears a distal fringe. The preceding joints are also more or less setose, the short 

 setae beginning near the distal extremity of the second joint and becoming fairly 

 numerous on the fourth. 



The Ovigers are ten -jointed and arise ventro-laterally immediately in front 

 of the first pair of lateral processes ; they differ in the two sexes. In the male 

 (fig. la), the first joint is small and stout, and the proportions of the five following 

 are as 4 : 2'3 : 4 : 4 : 2 ; the first of these, second of the appendage, is slightly 

 curved ; the next is less so, but with the three following forms a large curve, 

 the fifth joint being the only one that is distinctly curved itself All these 

 joints are setose, particularly on the outer side of the curvatures. The four 

 remaining joints are short ; the seventh is articulated at the end of the sixth, but 

 at the side, and makes nearly a right angle with it ; near its distal extremity 

 it is provided with a dense tuft of long setae. The eighth joint is similarly 

 articulated to the seventh, but in the opposite direction, and bears a smaller 

 tuft of long setae distally ; the ninth is the shortest joint. The three terminal 

 joints bear a small number, less than a dozen, of denticulate spines, most of 

 which occur on the terminal joint. They are not in a single row, and consist 

 of a slender shaft with seven closely-set flat teeth on each side. 



The oviger of the female is quite difi"erent and the articulation of its joints 

 is normal throughout (fig. lb). The first and third joints are together equal to 

 the second ; the fourth and fifth are sub-equal, and the longest on the appendage ; 

 the sixth and seventh are a little shorter and sub-equal, the eighth and tenth 

 are again shorter and sub-equal, and the ninth still shorter. Setae are scarce, 

 and the sixth joint is the only one that can be described as setose. The 

 denticulate spines occur on the four terminal joints, and are exactly like those 

 of the male, but much more numerous, there being upwards of a dozen on 

 each of the joints except the first of the series. 



With regard to the Legs, the second coxa is scarcely as long as the other 

 two together ; the proportions of the three following joints are as ^"5:6: 7'5 ; 



VOL. III. S 



