«6 THE VOYAGE OF H.M.S. CHALLENGER. 



extremely small auxiliary claws. Moreover, it is characterised by a ciu'iously-shaped 

 oculiferous tubercle. Its dimensions are as follows : — 



The body is almost quite smooth, while the appendages are richly furnished with 

 hau's. The slenderness of the body is not veiy great ; the lateral processes, however, 

 are widely separated (PI. XV. fig. 1). The cephalothoracic segment is shorter than the 

 proboscis ; it is narrow in the middle, while it shows a considerable swelling at the 

 beginning and at the end. The oculiferous tubercle is situated above the insertion of the 

 ovigerous legs. Seen laterally this shows the conical and pointed shape described by 

 Professor G. 0. Sars ; but seen from the front it is considerably flattened and broad, 

 terminating in two divergent points. It is furnished with four distinct eyes (PI. XV. 

 fig. 2). The i^roboscis is almost quite cylindrical. The abdomen is short. 



Of the appendages I have figured the mandiljles in fig. 3 on Plate XV. The second 

 joint is nearly triangular, and almost its whole surface is covered by strong hairs. At 

 the front one of the angles of the triangle terminates in the immovable claw, which is a 

 great deal shorter than the movable one. Both claws bear a row of spines, and are 

 strongly curved at their extremities. 



The drawing I have given in fig. . 4 of the palpi renders, I believe, a description needless. 



The ovigerous leg of the female is shorter and feel^ler than that of the male ; more- 

 over, it has the fourth and fifth joints quite straight, whereas the same joints in the 

 male describe distinct curves. The relative length of the joints is the same as in most 

 other species of the genus Ny million. In the male the sixth joint is furnished with a 

 small pointed tubercle, which I did not observe in the female. The males bear the eggs 

 on the fourth and fifth joints ; they are large and collected in one or two packets on both 

 legs. The four last joints show a row of denticulated spines of the shape figured on 

 Plate XV. fig. 5. The claw at the end of the ovigerous leg is strong and pectinated at 

 the extremity. 



The second joint of the legs is twice as long as the first and the third, the fourth 

 joint is as long as the fifth, the sixth is only a little longer. The first tarsal joint is not 

 quite half as long as the second. The claw is very long, almost as long as the second 

 tarsal joint. Very small auxiliary claws, easily overlooked, are situated on both sides of 

 the great claw (fig. 7). The second joint of the female is consideral^ly swollen at the 

 end, where it shows on every leg a large genital pore of an oval shape ; the fourth joint in 

 the same sex is also swoUen. The hairs on the first four joints in Ijoth sexes are not 

 very numerous, whereas, beginning with the fifth, the last joints are richly furnished 



