KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 289 



thus substituting the usual narrow groove at the hind margin; the hind margin is straight, 

 and without spines; the joint is about twice as long as broad. In the young male the 

 front margin is more regularly convex. The genu is about as long as broad, and has 

 the lower hind corner a little produced. The tibia is somewhat longer than the genu; 

 the front margin is feebly convex, and set with three or four short spines; the lower hind 

 corner is strongly produced downwards, forming a process which in the adult male is fully 

 as long as, or even longer than, the rest of the joint, in the very young animal this process 

 is about two-thirds as long as the stem of the joint. The carpus is enormously developed, 

 being even in the young animal longer than the femur, and in the adult more than 

 half as long again; it is broadest near the base, and is more than five times as long- 

 as broad in the adult male, being only three times as long as broad in the very 

 young male; the front margin is armed with a row of twelve to fifteen stout, spine-like 

 bristles, and has between them a fine pectination; the hind margin is feebly notched, and 

 set with some very short spines. The metacarpus is very long and slender, almost 

 rod-like, and fully as long as the three preceding joints together in the adult male; the meta- 

 carpus impinges against the front margin of the carpus, forming with it a perfect folding hand; 

 the lower half of the front margin is strongly pectinated, and set with a row of equidistant, 

 spine-like bristles; the long, spine-like teeth forming the pectination, are directed somewhat 

 downwards, and are thus not rectangular to the joint; the hind margin of the metacarpus 

 is entirely smooth. In some specimens I have seen a very short metacarpus, but otherwise 

 like that just described, probably its size depended upon that the joint had been broken and 

 reproduced. In the young the metacarpus is much thicker and shorter, scarcely longer than 

 the carpus, but armed as in the adult animal. The dactylus is feebly curved, stout, 

 and about an eigth part as long as the metacarpus; on the front margin it has a comb- 

 like set of long spines. In the very young animal the entire length of the fifth pair 

 scarcely surpasses the length of the sixth pair with a sixth or seventh part, but even 

 there the femur and the carpus show their characteristic form. 



The sixth, and seventh pairs (PI. XIII, fig. 29) are nearly similar in shape, and equal 

 in length; in the adult male they are nearly two-thirds as long as the fifth pair. The 

 femur is scarcely a fifth part shorter than in the fifth pair; that of the sixth pair is less 

 dilated than in the seventh, but is still much broader than in the following species, and only 

 a little more than twice as long as broad; that of the seventh pair is quite twice as long- 

 as broad; the front margin is straight, and has three or four spines near the apex; 

 the hind margin is straight, with the upper and lower corners rounded; it is feebly 

 notched, and provided with short spines. The genu is broader than long. The tibia 

 is about three times as long as the genu, and has the lower hind corner strongly 

 produced and tipped with a long bristle; the front margin is straight, and set with 

 long bristles in the seventh pair, in the sixth it has three equidistant spines. The 

 carpus is much longer than the tibia, but scarcely more than half as long as the femur; 

 it is a little broader below than above; the front margin is minutely pectinated, and armed 

 with spines in the sixth pair; in the seventh the front margin is set with long bristles. 

 The metacarpus is feebly curved, and is about as long as the carpus in the young 



K. St. Vet. Akad. Handl. Band. 2'2. N:o 7. « • 



