28 BOVALLTUS. NEW ISOPODA. 



The unis is as long as the pleon, broadly rounded, twice 

 as bro ad as long. 



The uropoda are tolerably long, the inner ramus is longer 

 than the outer. 



It IS very difficult to tell anything about the affinities, 

 of the species without knoAving the ovigerous female. It 

 seems to be most allied to Cymothoa recta. Dana; but the- 

 animal is provided with sufficiently good characteristics to 

 justify the establishing of a new species for it. 



The male. 

 Pl. V. fig. 58-61. 



The head is large and long, only a little shorter than 

 broad, the front margin forms no börder on the nnder-side, 

 but is only bent downwards in the middle ; the anterior margin 

 is rounded, the upper side slightly convex. 



The eyes are of medium size, placed a little behind the 

 middle of the head, near the lateral margins. 



The jirst pair of antennce are thick and robust, eight- 

 jointed, without distinction between the peduncle and the 

 flagellum, the last joints without hairs or spines. 



The second pair of antennen are considerably more slender, 

 a little shorter, eight-jointed. 



The processes of the first segment of the pereion are 

 shorter and narrower than in Cymothoa elegans, rounded at 

 the ends. The anterior margin of the first segment is slightly 

 emarginate; it is longer than the fourth segment (5: 4), and 

 only a little narrower than the lifth (5 : 6). From the llfth 

 to the seventh, the segments decrease in length, but scarcely 

 in breadth. The seventh segment is longer than half tlie 

 sixth. The three first secrments too-ether are as lono- as the 

 four last ones together. 



The epimerals of the second and third segments are fixed 

 along the whole length of the segments, the following ones 

 only along half or two thirds of the length of the corresponding 

 segments; all the epimerals are equal in length to their 

 corresponding segments. 



The first three pairs of pereiopoda have long strong dac- 

 tyli, fts long as the dactyli of the following pairs. The last 



