OF CRUSTACEA 



Lepas 



No limbs 



Antennules 



Lost in adult 



Mandibles 



Maxillules 



Maxillae 



Thor. limbs i ? 



2 



3 

 4 

 5 

 6d^ 





Nebalia 



o 

 -a 



CO 



o 



Telson 

 with rami 



No limbs ^ 



Antennules 



Antennae 



Mandibles 



Maxillules 



Maxillae 



Thor. limbs i 



2 



3 

 4 

 5 

 6? 



7 

 Abd. limbs i 



3 

 4 

 5 

 6 

 Abd. som. 7 



Gammarus 



Telson 

 with rami 



No limbs 

 Antennules 

 Antennae 

 Mandibles 

 Maxillules 

 Maxillae 

 Maxillipeds . 

 Legs I 

 II 

 III 

 IV 

 V? 

 VI 

 VII s 



Abd. limbs i 

 2 

 3 

 4 

 5 

 6 



Telson 



Astacus 



No limbs 



Antennules 



Antennae 



Mandibles 



Maxillules 



Maxillae 



Maxillipeds I 



11 

 „ III 



Legs I 

 „ 11 

 „ III? 

 „ IV 



„ V6^ 

 Abd. limbs i 

 2 

 3 

 4 

 5 

 6 



Somite 



Telson 



the position of the male opening, ? that of the female, a, joined but distinct, b, fused in 

 thoracic limb : the somite which bears it is often reckoned as the first abdominal. 



