56 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. THAUMATOPSID^E. 



distinct teeth on the hind margin. The tibia is longer than half the femur, provided 

 with hairs, and armed along the hind margin with ten blunt teeth. The carpus is longer 

 than the tibia, richly beset with hairs, especially at the lower anterior corner, and carry- 

 ing along the hind margin sixteen unequal teeth. The metacarpus is somewhat shorter 

 and much narrower than the carpus, all the margins smooth, but the outer side of the 

 joint showing nine transversal rows of fine hairs. The dactylus is small, slender, feebly 

 curved, a little longer than the breadth of the metacarpus. The length of the leg is 44 mm. 



The fifth pair (PI. IV, fig. 18 and 19) are considerably shorter than the peraeon 

 and pleon together, and not twice as long as the seventh pair. The, femur is dilated, 

 broadly rounded at the upper end, only five times as long as broad; the lower anterior 

 corner is produced into a broad, strong process, tridenticulated at apex, and carrying three 

 teeth on the hinder and three on the front margin; this process is fully as long as the 

 genu; the front margin of the femur is armed with nine teeth, the hinder margin with 

 nineteen, the inner margin is smooth. The femur is not twice as long as the femur of the 

 seventh pair, and only a fourth longer than the femur of the sixth pair. The genu is 

 fully as long as broad, the front margin with one large, apical tooth and two smaller ones 

 above. The tibia is dilated, but a little narrower than the femur, it. is not four times 

 as long as broad, the front margin is feebly curved, armed with fifteen unequal teeth, the 

 hind and inner margins are smooth, curved. The carpus is a third longer than the tibia, 

 and much narrower, the margins smooth. The metacarpus is feebly bent, longer than 

 the carpus, cylindrical, not prismatic, totally smooth, and filled with glandular mass 

 more richly than the preceding joint. The dactylus is very small, scarcely as long as 

 the breadth of the metacarpus, fixed subterminally, with a small, circular hole at the an- 

 terior corner of the base for the outlet of the glandular secretion. The length of the 

 leg is 63 mm. 



The sixth pair (PI. IV, fig. 20) are scarcely a third longer than the seventh pair. 

 The femur is dilated as in the preceding pair, scarcely four times as long as broad; 

 the upper end is broadly rounded, the lower anterior corner produced into a sharp-pointed 

 process, which has two teeth on the front margin and one at the middle of the hinder 

 margin; this process is fully as long as the genu; the front margin of the femur itself carries 

 ten teeth, the hinder margin eighteen, the inner is smooth. The genu is as long as broad, 

 with three teeth, the lowest, the produced hinder corner, the longest. The tibia is di- 

 lated, only a little narrower than the femur, not three times as long as broad, the front 

 margin with fourteen teeth, the other margins are smooth. The carpus is dilated, about three 

 times as long as broad, and a little longer than the preceding joint; the front margin 

 with fourteen unequal teeth, the other margins smooth; the sides are provided with hairs. 

 The metacarpus is narrow, prismatic, longer than the carpus; the front margin armed 

 with about fourty-five low but sharp, serrulated teeth, the hind margin with about eighteen 

 blunt, low teeth, the inner margin with about twenty-five, almost indistinct, teeth. The 

 dactylus is narrow, almost straight, longer than the breadth of the metacarpus. The 

 length of the leg is 47 mm. 



The seventh pair (PI. IV, fig. 21 and 22) are three times as long as the first pair, 

 and fully as long as the third pair. The femur is dilated, broadest above, the upper 



