418 CARL B0VALL1US, AMPHIPODA HYPERIIDEA. I. 2. ANCHYLOMERIDJE. 



Anchylomera Blossevillei. 



The fifth pair (PI. XVII, fig. 17) are considerably longer than the fourth pair, but 

 are shorter than the head and peraeon together. The femur is very dilated, shield-like, 

 irregularly pentagonal, with the upper portion broader than the lower; the apex is deeply 

 incised for the reception of the genu; the joint is only a third part longer than its greatest 

 breadth, and is fully as long as the three following joints together. The genu is very 

 large, longer than broad, and has the lower front corner projecting into a triangular pro- 

 cess. The tibia is shorter than the genu, but much wider. The carpus is about as 

 broad as long, with the front margin short and feebly convex, the under margin is oblique 

 to the axis of the joint, and is armed with five or six more or less rounded teeth decreas- 

 ing in size from the front corner to the articulation of the metacarpus; each tooth is 

 tipped with a minute bristle; the hind margin of the joint is feebly convex, and much 

 longer than the front margin. The metacarpus is as long as the carpus, and reaches, 

 when folded, almost to the front corner of the carpus or a little beyond it; the front 

 margin is smooth. The dactylus is straight, and nearly half as long as the metacarpus. 



The sixth pair (PI. XVII, fig. 17) are shorter than the fifth, reaching to the apex 

 of the carpus in that pair. The femur is dilated, very irregular in shape; the hind 

 margin is nearly straight from the constriction at the base; the front side of the joint 

 projects into a broad laminar process just above the middle; the lower front corner is 

 produced downwards into a bluntly triangular process, which is set with minute hairs; 

 the femur is fully as long as all the following joints together. The genu is broader than 

 long. The tibia is as long as the genu, with the front margin fringed with minute 

 hairs. The carpus is considerably longer than the two preceding joints together; it is 

 dilated, irregularly ovate, and together with the metacarpus forms a folding hand; the 

 front margin is convex, feebly notched, and fringed with minute, spine-like hairs. The 

 metacarpus is almost as long as the carpus, and has the front margin finely pectinated. 

 The dactylus is long, feebfy curved, and more than two thirds as long as the metacarpus. 



The seventh pair (PI. XVII, fig. 18) reach nearly to the middle of the carpus in 

 the sixth pair. The femur is dilated, almost as long as that in the preceding pair> 

 much broader above than below, and nearly twice as long as broad at the base; it is 

 considerably longer than all the following joints together. The genu is longer than 

 broad. The tibia is shorter than the genu. The carpus is almost as long as the two 

 preceding joints together, with the margins smooth. The metacarpus is not half as 

 long as the carpus. The dactylus is transformed, like that organ in the family Vibilidos; 

 it is tumid, and set at the apex with small, spine-like teeth. 



The pleon. The segments are equal in length; the first is as long as the last two 

 pergonal segments together, and is produced downwards, with the lateral part irregularly 

 rounded and projecting to the apex of the peduncle in the first pair of pleopoda; the 

 lateral parts of the last two segments are evenly rounded below and behind. 



The pleopoda (PI. XVII, fig. 19) have the peduncle fully as long as the rami. The 

 outer ramus of the first pair has nine or eleven joints, the inner eight or ten. 



The urus is somewhat more than half as long as the last pleonal segment. The 

 first ural segment is nearly twice as long as the last coalesced one, which is more than 

 twice as broad as long. 



