C8 THE VOYAGE OF H.M.S. CHALLENGER. 



The proboscis of this species is club-shaped, a little bent over to the ventral side ; 

 longer than the trunk with the abdomen. The cephalothoracic segment is comparatively 

 small and not distinctly divided into a cephalic and a thoracic part. Between the 

 lateral processes of the thoracic joints large intervals are to be observed. The oculi- 

 ferous tubercle is large and high, conical, furnished with four eyes. Of these, two are 

 very large and directed forwards, while the two directed backwards are a great deal 

 smaller and in all probability are rudimentary. The abdomen is small, only 1-1 3th 

 of the total length of the body. 



The palpi are slender, and the lengths of their joints are not very characteristic. 

 The third joint is much longer than the fifth, and of the three last joints the eighth is 

 very small, the ninth and tenth considerably longer. In the ovigerous legs the fourth 

 and sixth joints have nearly the same length, while the fifth is not quite half as long. 

 The four last joints are small, and nearly equal in length, growing however a httle 

 shorter and more slender towards the tenth joint. The claw is very short. 



The distribution and form of the denticulate spines is in this species very charac- 

 teristic. There are two rows of comparatively long and flat spines, the margins of which 

 show when greatly magnified very minute hairs ; in addition to these two rows a 

 moderate number of smaller flattened spines are found scattered over that side of the 

 four last joints which is bent inwards. I have figured these two rows and the ii-regu- 

 larly placed spines in figure 3 on Plate IX. 



The legs are not very long, nearly three times as long as the body in the 

 adult specimen, while the younger specimens have them much shorter. The 

 three first joints are very short, the fourth is the longest, viz., 23 mm.; in a leg, the 

 fifth joint of which measures 21 mm., the sixth is 18 mm. The two tarsal joints 

 are together as long as the sixth joint. The claw is large, almost as long as the second 

 tarsal joint. 



The surface of the body and of the legs is almost entirely smooth. The palpi 

 show only very small haii"s, and on the ovigerous legs hardly any hairs are to be 

 observed. 



Of this species seven specimens were dredged. They are, I think, all young ones 

 with the exception of one specimen which is a male. It shows genital pores ventrally 

 on the second joint of aU the legs. 



