KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 323 



be the homologue of the fourth joint in that pair of Euthemisto, and thus the true carpus. 

 The metacarpus is enormously developed, forming together with the dactylus a perfect 

 »dactylocheliform hand»; the stem of the joint is thick, and broadly dilated, not fully 

 twice as long as broad, and only a little shorter than the femur; the margins are feebly 

 convex; the metacarpal process is thick and stout, half as long as the stem of the joint; it 

 has the front margin uneven, and very narrowly channeled, especially at the apex, where the 

 apex of the dactylus is received; in the joint there is an unusually large adductor-muscle 

 divided into two portions, occupying almost the whole of the interior of the joint; in 

 front of this muscle runs the narrow retractor. The dactylus is thick, elongate-triangular, 

 and reaches almost to the apex of the metacarpal process. Glands are present in all the 

 joints, especially in the femur and in the dactylus, which latter joint shows a very small 

 fissure-like opening for the outlet of the glandular secretion at the obtuse apex; this 

 opening is bordered in front by a minute semicircular wall or ridge. 



The third and fourth pairs (PL XIV, fig. 18 — 20) are similar in shape, and equal 

 in length. The femur is narrow, a little broader below than above, and is shorter than 

 the three following joints together; the genu is somewhat longer than broad. The tibia 

 is fully twice as long as the genu, with three equidistant spines on the hind margin, the 

 lowest the longest. The carpus is longer than the two preceding joints together, and is 

 armed with three equidistant, spine-like bristles on the hind margin ; the joint is not dilated, 

 not being broader than the tibia. The metacarpus is as long as the carpus, feebly 

 curved, and finely serrated or pectinated along the hind margin; the lower hind corner is 

 produced into a sharp-pointed, triangular process which, together with the dactylus, forms 

 an imperfect prehensile organ (PI. XIV, fig. 20); the front side of this metacarpal process 

 is armed, with three or four strong teeth. The dactylus is long and slender, feebly 

 curved, and a trifle more than half as long as the metacarpus; it has a circular glandular 

 opening at the hind side of the heel-like base. 



The fifth, sixth, and seventh pairs (PL XIV, fig. 21 — 24) are subequal in length; 

 the fifth pair are longer than the head and peneon together. The femur is very narrow, 

 a little broader below than above, and fully six times as long as it is broad below; the 

 front margin is fringed with minute hairs, and has the lower corner produced into a 

 sharp-pointed process, which is almost half as long as the genu. The genu is longer 

 than broad, with the front margin fringed with minute hairs, and the lower corner pro- 

 duced and sharp-pointed. The tibia is twice as long as the genu in the fifth and sixth 

 pairs, in the seventh it is a little shorter; the front margin is fringed as in the preceding 

 joint, and has the lower corner produced. The metacarpus is much longer than the two 

 preceding joints together, and is almost as long as the femur in the fifth and sixth pairs, 

 in the seventh on the other hand the carpus is quite as long as the two preceding joints 

 together, and is much shorter than the femur; the front margin is fringed with minute 

 hairs and a few short spines; the lower corner is truncated, not produced; the hind 

 margin has a few minute spines. The metacarpus in the fifth pair is shorter than, in 

 the sixth as long as, and in the seventh much longer than, the carpus; the front margin 

 is armed as in the preceding joint, and has the lower corner produced into a sharp- 

 pointed process as in the third and fourth pairs; the hind margins of the narrowly ex- 



