1376 



CRUSTACEA. 



pair of feet in profile ; /, penult natatories ; g, posterior or fourth pair 

 of natatories ; h, mandible and extremity of buccal trunk. 



From the body of a shark, northeast of New Zealand, April 15, 

 1840, where it occurred along with Nogagus. 



The sucker disks are large and oblong. The second segment of the 

 body is prolonged on each side as far backward as the carapax. The 

 fourth segment is considerably narrower than third, and a little nar- 

 rower than the abdomen. The first segment of the abdomen is truncate 

 behind, but with the posterior angles cut off, and a minute seta at the 

 outer apex. The second segment has the posterior angles very deeply 

 removed, and their places occupied with the stylets. 



The plumose setae at apex of anterior antennae are as long as the 

 second joint. The buccal trunk is a long slender beak, with the man- 

 dibles exsertile at apex. The mandibles are long and straight, curv- 

 ing a little towards the place of their insertion, and having a minutely 

 denticulate inner margin at apex. 



The posterior antennae are similar to those of female Caligi, having 

 a recurved pointed apex. 



The first pair of legs have the furcation extending half way to apex 

 of basal joint. 



The second pair is very stout, like that in the species of Nogagus 

 described. The stout blunt finger folds against the oblique outer 

 surface, and extends to a blunt immoveable finger, the apex of which 

 is corneous. 



The last six natatories are very broad, and have long plumose setae 

 on the Particulate branches. The basal joint of the first pair has a 

 projecting apex, and is longer than broad. 



The pigment of the two eyes was deep blue; the colour of the 

 minute spot between, bright red. 



