occurring on the Norwegian Coasts. 415 



groove beset at its margins with tubercles along the* anterior 

 side, within which the anterior margin of the hand can lay 

 itself. This is large, oval, longer than the first joint, and 

 beset with tubercles all over ; on the hinder margin there are 

 three strong teeth — one that meets the apex of the claw, and 

 two others nearer its point of attachment. The claws are long 

 and beset with tubercles. The three posterior legs, which 

 gradually increase somewhat in length, are elongated, and of 

 the same form as in ^. Jongicornis^ Kr. All the segments of 

 the body are strongly beset with tubercles, among which the 

 following are especially distinguishable : — two directed for- 

 ward on the up])cr surface of the head ; a pair upon the ante- 

 rior end of the iirst segment ; two upon the anterior end of the 

 second segment, and a very large one, cleft in the middle, and 

 a double spine at the hinder end of the segment : besides these 

 there is a long strong spine, directed forwards, which covers 

 the origin of the feet of the first pair, and which appears to 

 represent a rudiment of the deficient epimeron. In the fol- 

 lowing segment likewise similar tubercles cover the origin of 

 the respiratory vesicles and the remaining space. On the 

 following segments tubercles stand in irregular transverse 

 rows, without any distinguishing themselves from the rest, 

 except the lateral tubercles above the origin of the respiratory 

 vesicles and legs. The form of the respiratory vesicles and 

 abdomen is in all respects as in j3^. longicornis. The animal 

 is from 35-40 millims. in length. 



^. hcvis, mihi. — The body in this species is smooth and 

 even all over, without tubercles or spines, and resembles 

 in appearance ^. longicornis ; it nevertheless differs much 

 from that species. The superior antenna; reach to the sixth 

 thoracic segment; the pedimcle is longer than the flagcllum, 

 of which the second joint is the longest and the first the 

 shortest. The flagellum consists of eighteen joints. The in- 

 ferior antennai reach to the end of the peduncle of tlie superior 

 antenna}. The buccal organs as in the preceding species. 

 The first pair of legs are short. The first joint and the hand 

 are of equal length ; the fourth joint is produced downwards 

 behind into a process clothed witli hairs ; and the hand is oval, 

 with its posterior margin furnished with many small teeth. 

 The second pair of legs are very long, about as long as the 

 first three segments of the body together. The first joint is 

 long, and furnished on its anterior margin with a longitudinal 

 depression, in which the anterior margin of the hand can lay 

 itself. The hand is about as long as the first joint, elongate 

 oval ; its posterior margin is furnished with tln*ee teeth, one 

 of which, situated where the finger meets the hand, is very 



