96 THE VOYAGE OF H.M.S. CHALLENGER. 
extremely small auxihary claws. Moreover, it is characterised by a curiously-shaped 
oculiferous tubercle. Its dimensions are as follows :— 
Length of the proboscis, . ; : : - : 5 2°3 mm. 
Total length of the body, 9, . : : : ; ‘ ba ys 
Total length of the body, 4, : . ; ; : , Dek 5s 
Length of the ovigerous leg, ?, ‘ : : : : : 64 ,, 
Length of the ovigerous leg ,g, : : : - ; il Bs 
Length of the leg of the third pair, : : : ; ? 13" 
The body is almost quite smooth, while the appendages are richly furnished with 
hairs. The slenderness of the body is not very great; the lateral processes, however, 
are widely separated (Pl. 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 inser- 
tion of the ovigerous legs. Seen laterally this shows the conical and pointed shape 
described by Professor G. O. Sars; but seen from the front it is considerably flattened 
and broad, terminating in two divergent points. It is furnished with four distinct eyes 
(Pl. XV. fig. 2). The proboscis is almost quite cylindrical. The abdomen is short. 
Of the appendages I have figured the mandibles 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 feebler 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 Nymphon. 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 jomts 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 ot 
the great claw (fig. 7). The second joint of the female is considerably 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 swollen. The hairs on the first four joints in both sexes are not 
very numerous, whereas, beginning with the fifth, the last joints are richly furnished 
