b BOVALLIUS. NEW ISOPODA. 



The first segment of the pereion is the longest; the foUow- 

 ing decrease in length; the seventh is concealed by the sixth. 



The epimerals are subequal in length; they are bent in- 

 "wards, forming a kind of frame on the under-side of the body, 



The metacarpi of the three first pairs of pereiopoda are 

 provided with a chisel-formed process. The seventh pair is 

 the longest, spinigeroiis. 



The U7ms is large, triangulär, pointed, nearly as long as 

 broad (17 : 18). 



The inner ramus of the uropoda is deeply incised on its 

 outer margin. 



In habitus our animal comes very near Aega Deshayesiana, 

 but it is easily distinguished by the sixth pereional segment 

 being concealed, by the shorter urus, and by the chisel-formed 

 processes on tlie metacarpi of the three first pair of legs. From 

 Aega Webbii it differs also by the form of the urus, and from 

 Aega dentata by the shorter antenn», by the armature of the 

 three first pairs of pereiopoda, and by the form of and the urus 

 of the uropoda. 



Adult niale. 

 Pl. I. fig. 1—10. 



The front margin of the head is rounded, the hind mar- 



o;in is straio-ht. 



o o 



The tip of the front separates only the uppermost third of 

 the basal joints of the upper antennae from each other. The 

 head is a little broader than half of the fourth pereional seg- 

 ment (7 : 13) and more than thrice as broad as long. Its upper 

 surface is smooth. The e7/es are very large, oblong. The an- 

 terior margins are angulatcd. Thore is only a narrow strip of 

 the front between them. The ocelli are arranged in nine rows, 

 with twenty-two in the middle one. 



The Jirst jjair of antennen (Pl. I fig. 4) do not reach to 

 the hinder margin of the head. The basaj joint of the peduncle 

 is the longest and broadest, the third one the shortest. The 

 fiagellum consists of seven short articuli carrying very short 

 hairs; the last artide is very slender. 



The second pair of antemice (Pl. I fig. 4) reach very nearly 

 to the hinder margin of the first pereional segment; the two 

 first joints of the peduncle are very short, the third is a little 



