60 THE VOYAGE OF H.M.S. CHALLENGER. 



The proboscis is inserted ventrally on the cephalothorax, at a considerable distance 

 from the front margin ; it is of a distinctly ovate form, and bears the small triangular 

 mouth surrounded by slightly swollen lips. 



The mandibles are represented by one-jointed robust club-shaped bodies, placed at 

 the front margin of the cephalothorax on both sides of the oculiferous tubercle, but not 

 reaching quite so far as that organ. The mandibles are covered all round with strong 

 hairs, placed at right angles to the surface, and when the mandibles are viewed from 

 below and anteriorly, the round cicatrice is observed where in all probability, at an earlier 

 date, a second joint has been inserted. 



The palpi are nine-jointed and placed close to and on both sides of the base of the 

 proboscis. The first joint is very short, the second is the longest of all and directed 

 forwards, the third again is short, the fourth almost as long as the second, and bent so as 

 to form an angle with the first three joints. The fifth joint is again very short, the 

 four last joints are nearly of the same length ; the sixth, however, is the longest, and the 

 eighth the shortest. All the joints are furnished with very strong hairs, which are 

 longest on the third and fourth joints, and decrease in size though not in number 

 towards the extremity of the appendages. 



The ovigerous legs are strongly curved. Of the first three joints, which are not 

 so very small as is the case in other genera, the second is the longest, being nearly 

 twice as long as the first. The fourth and fifth joints are nearly of the same length and 

 are the longest of all. The sixth is not quite half as long as either of the two foregoing 

 joints ; of the seventh to the tenth the first is the longest, the second much shorter 

 and the third a little shorter, while the last joint is extremely small and may easily 

 be overlooked. The first three joints are almost smooth, the two following are furnished 

 with very small hairs, and the sixth to the tenth mth not very numerous Ixit longer 

 hairs. The last joint but one is armed with one, the last with two not very strong, 

 comparatively broad, and slightly serrated spines. The total length of the ovigerous 

 leg is not quite so long as that of the body without the abdomen. 



The legs are comparatively strong and very hairy (PL VII. fig. 6). The lateral 

 processes are furnished wdth numerous small and curved spines ; the first three joints of 

 the leg are small and nearly of the same length. The fourth joint is twice as long as the 

 third, and on the dorsal surface beyond the middle it bears a tubular process,' directed 

 backwards towards the origin of the leg. The fifth and sixth joints are the longest in 

 the leg, and are nearly of the same length. The fifth joint, however, is a great deal more 

 slender than the fourth, and the sixth much more so than the fifth. The first tarsal joint 

 is extremely small, the second long and distinctly curved ; the claw is scythe-shaped, 

 and accessory claws are wanting. All the joints are furnished with long and strong 

 hairs, standing at right angles to the surface ; the last joints are covered with much more 

 delicate hairs. 



