PYCNOGONIDA. 21 



neck ; anteriorly it is much expanded, the two lobes being separated by a small but 

 conspicuous groove. 



The Ocular tubercle is situated immediately in front of the first lateral 

 processes ; it is comparatively stout, short, truncate, and bears four well-developed 

 eyes without any pigment. 



The Abdomen is small, ovoid, does not project beyond the last pair of lateral 

 processes, and is not articulated to the trunk. The length of the body is 7" 5mm. and 

 its width is almost 4mm. 



The Proboscis is cylindrical, smooth, and directed obliquely downwards ; it is 

 about 3mm. in length. 



The Chelifori are well developed. The scape is as long as the proboscis, slightly 

 curved and sparsely covered with minute setse ; the distal fringe is not conspicuous. 

 The chelse are also curved, half their length being taken up by the palm, which 

 is finely setose, the setse extending on to the base of the immovable finger. The 

 fingers are slender, much incurved at the tip. The teeth are numerous and regular 

 in size, not so closely set in the immovable finger as in the other. 



The Palp is slender, five-jointed, and rises at the side of the proboscis below the 

 chelifori (fig. la). The first joint, as usual, is very small ; the second is the longest of 

 the appendage, slightly swollen distally, and sparingly covered with minute setse. The 

 third joint is but a little shorter, rather stouter, and more liberally supplied with 

 short setae, though these are still scanty. The fourth joint is scarcely half as long 

 as the second, very richly supplied with short setse on its ventral margin, much 

 more sparingly dorsally. These three joints have a well-defined distal fringe. The 

 terminal joint is nearly half as long again as the preceding and, like it, richly clothed 

 with short setse ventrally, more sparingly dorsally. 



The Oviger is ten -jointed, and arises ventro-laterally in front of the first lateral 

 process on a prominent body-process, the position of which is clearly seen from the 

 dorsal surface (fig. lb). The first three joints are small and stout, the third 

 curved and having a very oblique termination ; only a distal fringe of very 

 small setse can be detected on these joints. The fourth joint is very long, slightly 

 curved, with very few minute setse besides the distal fringe. The fifth joint is 

 much the longest of the appendage, and is thinly covered with very small setse, 

 with a more strongly marked distal fringe. The sixth joint is little more than 

 half as long as the preceding, slightly curved, and thickly clothed with small 

 stiff setse on its outer side and a well-developed distal fringe. The four terminal 

 joints are long, progressively decreasing in length, but the last two are sub-equal. 

 All are more or less well supplied with short stiif setse dorsally and a distal fringe 

 of rather longer setse. The terminal claw is long and slender, with about fourteen 

 curved teeth. The denticulate spines are long, and in the specimen critically 

 examined occur 13 : 10 : 10 : 9 on the various joints. (Plate X., fig. 8.) The shaft is 

 flattened and slender, and carries eight to ten teeth on each side ; the third or fourth 



