REPORT ON THE PYCNOGONIDA. 37 



fourth, fifth, third, second. The first and second joints are almost entirely smooth, the 

 third joint with small and the fourth and fifth with stronger hairs. 



The ovigerous legs of the males are stronger than those of the females, and in all the 

 specimens are bent as shown in the figure (fig. 2). The fourth joint is curved, the fifth 

 thinner, and much longer than the fourth, and swollen at the extremity ; the sixth is 

 short, the seventh, eighth, ninth, and tenth very short ; the first joints are sparsely hairy, 

 the fifth not very hairy, the sixth hairy, with a row of stronger hairs at the outer extremity 

 of the joint. The spines of the four last joints are not very denticulated (figs. 4 and 5), 

 their numbers are respectively 12, 10, 9, 12 ; the end claw is denticulated also. 



In the females the ovigerous legs are shorter, and not bent as in the males. The 

 fifth joint is only a little longer than the fourth, the sixth joint is less hairy, the 

 denticulated spines of the four last joints not so numerous, their numbers being 

 respectively 11, 7, 5, 7. 



The legs are very long, measuring, for instance, 38 mm. in a female of 11 mm., 

 and 44 mm. in a male of 13'5 mm. (1 : 3'4, and 1 : 3'3) ; the second joint, which is 

 swollen at the extremity in the females is longer than the first and third joints ; 

 the fifth joint is the longest, the sixth not much shorter ; the second tarsal joint is 

 longer than the first, the claw is not very strong, nearly half the length of the second 

 tarsal joint (fig. 9). Auxiliary claws are wanting. The fourth joint of the leg, which 

 in the females is swollen with the ovary, is furnished at the extremity with a 

 hook-like process bearing one or two hairs (fig. 8). I believe this is the first species of 

 Nymphon, in which this process has been observed, and therefore I have named the species 

 after it. This fourth segment is furnished in the males with a row of knobs, closed at the 

 extremity by a thin perforated membrane (fig. 7). Both males and females have the 

 legs almost entirely smooth, the hairs being so small as to be only visible under the 

 microscope. Larger hairs are seen at the extremity of the joints. The last joints are 

 furnished with small but very dense hairs. The genital openings of the females are 

 large, and easily observed on the lower side of the second joint on each leg (fig. (3). 

 Those of the males are a great deal smaller, and six in number ; they are not found 

 at the first pair of legs. The colour of alcoholic specimens is light yellowish (for the 

 larvas see below). 



Habitat. — This very beautiful species was dredged during the Challenger Expedition 

 between the Cape of Good Hope and Kerguelen, oS" the Crozets Islands. There are in 

 all eight specimens, of which four are males and four females. One of the males was 

 furnished with eggs, or rather with young ones, adhering still to the accessory legs. 

 The species was found at two stations, at 1375 and 1600 fathoms. At the same time 

 were obtained two specimens of Ascorhynchus glaber, Hoek, two of Colossendeis gigas, 

 Hoek, three of Colossendeis leptorhyiichus, Hoek, three of Colossendeis gracilis, Hoek, 

 and one of Phoxichilidium pilosum, Hoek. 



