50 



AMPHIPODA 



Gammarus fluviatilis. Side view. 



ist antenna; 2nd antenna; head (with which the ist thoracic segment is fused); oral appendages; 

 eyes; the seven free thoracic segments; the six abdominal segments. 



Appendages of G. fluviatilis, mounted and seen with low power : 



antenna i. 

 antenna 2. 

 mandible, 

 maxilla i. 

 maxilla 2. 



