THE COPENHAGEN MUSEUM AND OTHER SOURCES. 37 



First gnathopods. The side-plates ave sinall, triangular, with the apex to the rear. The 

 second joint is slender, narrowest at tlie base. The small third joint is larger than the 

 fourth The fifth joint is very much Avider and much longer than the second joint. It 

 may he regarded rather as the hand tlian the wrist, its long and slender curved apical 

 proces«i, tipped Avith a slightly curved needle-like spine, forming the immovable finger 

 of the chela, while the sixth and seventh joints form the movable finger. The sixth 

 joint is slender, i-ather straighter than the process of the fifth, but otherwise very like it, 

 and tipped with a similar spine, which must be regarded as the seventh joint. It might 

 be sujiposed that tlie fifth joint in this remarkable form rejiresented a coalescence of the 

 wrist and liand, did not a com2)arison with the first gnathopods iu Leucotho'e make it 

 reasonably certain that the chela is composed in the way just described. 



Second gnathopods. The side-plates are very large, rounded in front, produced beyond 

 the first segment. The second joint is narrow, distally somewhat widened, a little curved. 

 The third joint is of stouter build than usual, apparently articulating Avith all the three 

 folloAving joints. The fourtli joint is small, most of it lying flatly on the inner surface 

 of the fifth joint, with which it seems to be in coalescence. The fifth joint is subequal 

 to the second, liut In-oadest at its base and apically pointed. The hand is broad and 

 between three and four times as long as its breadth, the liind margin distally cut 

 into three teeth. The finger, more than half the length of the hand, has a curved 

 acute tip, and two slight projections on the inner margin. The complex clasjier is 

 formed by its impinging against the apex of the Avrist and the denticulations of the 

 hand. The peculiar arrangement of the third and fourth joints may be explained by 

 the extraordinary massiveness of tliese limbs and especially of the hand, Avliich is in 

 striking contrast to that of the preceding pair as well as to the general structure of the 

 other limbs. 



First 2)erceopods. The side-plates are as deep as the preceding pair, but of much less 

 Avidth. The branchial vesicles are all of remarkably small size. The second joint 

 reaches a little beloAv the side-plate. Of the other joints the fourth is the widest, the fifth 

 is sliorter than the sixtli, tin; nail is slender and curved. 



Second percBopods. The side-plates are rather Avider than the preceding paii-, with a 

 faint emargination at the farther end of the loAver margin and a very shallow excaA^ation 

 at the upper part of the hind margin. The limb differs but little from the preceding. 



Third ferceopods. The side-plates are bilobed, Avith the hinder lobe the larger. The 

 second joint is not much longer than wide. The fourth joint has the hind margin 

 slightly produced. The rest of the limb is missing. The spiny armature in these and 

 the other limbs is insignificant. 



Fourth per ceopods. The side-plates are lobed behind. The second and fourth joints are 

 rather larger than in the preceding and foUoAving pairs. 



Fifth perceopods. The side-plates are small, rounded behind. The second joint is rather 

 more strongly spined along its front margin than is the case in the other limbs. 



Fleopods. The rami are small, five- or six-jointed, shorter than the peduncles. 



JJropods. The first pair are the longer. In both, the inner ramus is a little longer and 

 the outer considerably shorter than the peduncle. Tlic third pair are missing. 



