142 CRUSTACEA. 



Acanthonotus (Owen). None of the feet fanged; 

 superior antennae without a filament. 



A. testudo. Fig. 260 ; n. s. 



Anonyx (Kroyer). Superior antennae thick at 

 the base ; furnished with a lash ; first and second 

 feet fanged. 



A. albus. Fig. 261 ; mag. f . 



Opis (Kroyer). As Anonyx, but the second 

 feet not fanged ; the claws of first feet very large. 



0. typica. Fig. 262 ; mag. f . 



FAMILY III. ORCHESTIAD^. 



Talitrus (Latr.). Second feet not clawed; supe- 

 rior antennae shorter than the base of the inferior, 

 simple ; inferior antennae very long, thread-shaped. 



T. locusta. Fig. 263 ; n. s. 



Sulcator (Bate). Superior antennae half as long 

 as the inferior, forked ; inferior antennae with the 

 second joint flattened ; second and third feet two- 

 clawed. 



S. arenarius. Fig. 264 ; n. s. 



Orchestia (Leach). First and second feet clawed; 

 superior antennae shorter than the base of the 

 inferior; foot-jaws obtuse. 



0. littorea. Fig. 265 ; n. s. 

 Deshayesii. 



