6 BOVALLIUS, A NEW SWEDISH ISOPOD. 



cany buudlos of loug hairs in tlie hinder inner corners, and 

 single sinall oues in the outcr corners. The tip of" tlie Ihi- 

 gellum reaches very nearly to the fourth segment of the 

 pcreion. 



The mouth is transforined into a short sucking tube, 

 with the raandibles and maxilla? acting as rasping organs, 

 as is the casc in all Aegidoa. Jn the present species the 

 mouth is a littlc simpler than in Aega, Eocinela, Alitropus, 

 and Aegiochus, the mandibles being simpler, and the palp 

 of the maxillipeds only one-jointed. 



The mandibles (Pl. 1 fig. 4) are not spirally bcnt and end 

 in a simple point without tceth. They carry each a three- 

 jointed palp; the first joint is the broadest and longest, 

 without hairs; the second is a little shorter, linear, with a 

 comb of short fine bristles at the outcr corncr. The last joint 

 is the shortest, and narrower than the preceding one. It 

 carries some i'ew short stifi' hairs at the hinder margin and 

 some longer ones at the tip. 



T/ie Jirst pair of maxillce (Pl. I lig. 5) are very nearly 

 of the same form as in Aega and the other Rocinela?, but 

 with only two tceth at the tip. 



The second pair- of uia.riUce (Pl. 1 fig. 6) form a tube, 

 with three strong hooks at the tip. The tube is u little 

 morc closed than in Aega psora and Rocincla danmoniensis. 



The maximillipeds (Pl. I fig. 1) are strong and robust, 

 and consist of a two-joiuted peduncle and a two-joiuted 

 palp, thiis oftering a more simple structure than in the two 

 above-mentioned species. The last joint of the ]ialp carries 

 only some small straight tceth, but no hooks as iu other 

 species. 



Tlie jjei-eion is slightly convex; seen from above it is 

 broadly ovate, sharply distinct from the rauch narrower pleon. 

 The first segment is the longest; when the body is bent, 

 the other seem subecjual in Icngth. Tlie second and third 

 segments are the broadest; the scventh is the narrowest, 

 but much broader than the following first pleonal segment. 

 The epimeral of the first segment is not distinct; all the 

 other six segments carry distinct epimerals of unequal size. 

 The siirfacc of the segments is smootii and härd, as if po-, 

 lished. On the under side (Pl. II fig. 12) of each segment 



