33 



ASTACUS 



5. Antenna: two-jointed basal portion; tubercle carrying orifice of the green gland; pointed scale; filament 

 of three large basal joints and a many-jointed continuation. 



ff 



f 



T s&dt 



6. Antennule: three-jointed basal portion; outer and inner many-jointed filaments. 



7. Enlarged view of dorsal aspect of the basal joint of same : opening of statocyst. Cut open the joint to 

 see the statocyst, containing grains of sand. 



