412 



AMPHIPODA. 



NATATORU. 



GAMMARID^. 



GAMMARIDES. 



ETSCLADUS LONGICAUDATUS. N. S. 



Specific character. Eyes round. Superior antennfe more than half the 

 length of the animal. Inferior antenna? nearly as long as the superior, both 

 strongly setose on the inferior margin. Second pair of gnathopoda having 

 the propodos with the palm excavated. Posterior pair of pleopoda having 

 the inner ramus rudimentary, the outer one longer than the peduncle, and 

 tipped with a second joint or strong spine. Telson lanceolate. 



Length \ inch. 



The body of this animal is arched ; the sixth segment 

 being nearly three times as deep as the first. The eyes 

 are round, and situated on a lobe projecting forward 

 between the superior and inferior antennae. The su- 

 perior antennas are more than half the length of the 

 animal, and the peduncle is longer than the flagellum. 

 The inferior antennae originate posteriorly, and do not 

 reach quite as far as the superior ; the peduncle is longer 

 than the flagellum. In both pairs the peduncle as well 



