178 CAbL BOVALLiUS, ÅMPHIPODA JSYPEEIIDEA. 1. 2. HYPERIID^. 



Hyperia Gaudicliaudii. 



The 111 a 1 e. 



Pl. X, lig. 18—23. 



The body is comparatively vvider than in the preceding species, and the legs a little 

 shorter and thicker. 



The head is shorter than the first two pera^onal segments together, fully twice as 

 deep as long, and comparatively less broad than in Hyperia galha. 



The epimeral of the first pair is much deeper than long, that of the second 

 pair as long as deep, and those of the following pairs longer than deep. 



The first pair of perceopoda (Pl. X, fig. 19). The femur is somewhat longer than 

 the four following joints together. The carpus is almost exactly like that joint in Hyioeria 

 Latreillei; the hind margin shows two notches set with bristles. The metacarpus is 

 shorter than the carpus; the hind margin is seiTated, not notched, the serration is formed 

 by simple, equal teeth (Pl. X, fig. 20). The dactylus is more than half as long as the 

 metacarpus. 



The second. p><^'i^' (P^- ^7 ^g- ^1) ^'"*^ somewhat longer than the first pair, but do 

 not reach fully to the apex of the carpus of the third pair. Thus the first two pairs are 

 comparatively a little shorter than in Hyperia Latreillei, but longer than in H. galba. 

 The femur is somewhat longer than the four following joints together. The front side 

 of the carpal process is shorter than half the hind margin of the metacarpus, which is 

 serrated as in the first pair. The dactylus is more than half as long as the metacarpus. 



The third and fourth pairs (Pl. X, fig. 22) are similar to those pairs in Hyperia 

 Latreillei; the femur is perhaps somewhat broader than that in H. galba. 



The fifth, sixth and seventh pairs (Pl. X, fig. 23). The femur is a little shorter 

 than that of the third and fourth pairs, but not broader. The metacarpus is longer 

 than the carpus, and scarcely more than half as long as the femur; the front margin is 

 smooth, not serrated. 



The pleon equals in length the last six personal segments together; the lateral 

 parts of the last two pleonal sements are rounded below, the hind corner angulated, and 

 sharp-pointed. The first segment is rounded below and behind. 



The urus is a little longer than the last pleonal segment; the first ural segment is 

 somewhat longer than the last coalesced one. 



The uropoda. The first pair do not reach to the apex of the last pair; the 

 rami are about equal in length, elongate-lanceolate, and much shorter than the peduncle. 

 The second pair reach beyond the apex of the peduncle of the last pair; the peduncle 

 is much longer than the inner ramus; the outer ramus is shorter and narrower than 

 the inner one. In the third pair the peduncle is fully twice as long as broad, and 

 much longer than the inner ramus, but not twice as long; the rami are equal in length, 

 serrated as in the preceding species; the inner ramus is much longer than the breadth of 



the peduncle. 



