10 



BOVALLIUS, SOME AMPHIPODOUS GENERA. 



The two first pairs of 

 thoracic legs very small, 

 alender, compressed. 



The last joints of the 

 second pair forming a 

 didactyle hand; the mo- 

 veable finger consists 

 of the two last joints, 

 and is longer than the 

 fixed one. 



The third and fourth 

 pairs of thoracic legs 

 are the longest. 



The peduncles of the 

 swimming feet are lon- 

 ger and more slender 

 than in Hyperia; the 

 rami are almost linear. 



The rami of the ap- 

 pendices of the tail are 

 lanceolate, long and 

 sharp. 



The two first pairs of 

 thoracic legs small but 

 robust, not compressed. 



The last joints of the 

 second pair forming a 

 chela, not a didactyle 

 hand, the moveable fin- 

 ger consists of the two 

 last joints. 



The third and fourth 

 pairs of thoracic legs 

 are shorter than the 

 fifth pair. 



The peduncles of the 

 pleopoda are short and 

 thick, the rami are 

 broad robust elliptical. 



The rami of the uro- 

 poda are broad ovate 

 or elliptical, commonly 

 not very long, sharp. 



The two first pairs of 

 periopoda small,slender, 

 compressed. 



The last joints of the 

 second pair forming a 

 didactyle hand, the mo- 

 veable finger consists 

 only of the last joint, 

 and is longer than the 

 fixed one. 



The third and fourth 

 pairs of pereiopoda are 

 the longest, or as long 

 as the fifth jiair. 



The peduncles of the 

 pleopoda are longer and 

 more slender than in 

 Hyperia, the rami are 

 almost linear. 



The rami of the uro- 

 poda are commonly lan- 

 ceolate, long, and sharp. 



1. Paraphronima gracilis, Claus. 



Head deeper than long (26 : 23), nearly equalling tlie four 

 following segments in length (23 : 24). The upper antennse 

 about a third of the length of the head. The fourth pereional 

 segment is longer than the first and second together (5 : 8). 

 The seventh is longer than the fourth (11 : 10). The first 

 and second pairs of pereiopoda ^) are equal in length, the 

 carpus of the first is very broad with the infero-anterior angle 

 very sharp. The third and fourth pairs equal, shorter than the 

 fifth and sixth, which are equal. The seventh pair are shorter 

 than the sixth (11 : 16). The first pleonal segment is the 

 longest; it is longer than the seventh pereional segment, its 

 sides are saddle-shaped. The pleon equals the four preceding 

 pereional segments in length. The peduncles of the pleopoda 

 are more than twice longer than the rami. The first pair of 

 uropoda are shorter than the second and third. 



Hab. The Atlantic. 



') >Gnathopoda> Spence Bate. 



