EGMENTATION BETWEEN THE CLASSES OF THE ARTHROPODA. 





Insecta 

 (Machilis). 



Symphyla 



(Scolopendrella). 



DiPLOPODA 



(Polyxenus). 



Chilopoda 



(Lithobius). 



ialacostraca 



(Astacus). 











alked Eyes 



Ocular Segment 





Ocular Segment 



Pre-antennal rudiment.- 



itennules 



Feelers 



Feelers 



Feelers 



(Scolopendra) 

 Feelers 



itennse 

 andibles 



Tritocerebral 



Segment 

 Mandibles 



Mandibles 



Mandibles 



Tritocerebral Segment 

 Mandibles 



t MaxiUffi 



Maxillulse 



Maxillulae 



j 



1st MaxiUse 



id ,, 



1st Maxillae 



1st Maxillae 



( Gnathochilarium 



2nd ,, 



t MaxiEipeds 



2nd Maxillae 



2nd Maxillae 



[Vestigial Seg- 



Poison-feet 



Id „ 



(Labium) 

 1st Legs 



1st Legs 



ment] 

 1st Legs 



1st Legs 



d „ 



2nd „ 



2nd „ 



2nd „ 



2nd „ 



lelse 



3rd „ 



3rd ,, 



3rd „ ^' 



3rd „ 



t Legs 



1st Abdominal 

 Segment 



4th „ ^ ? 



4th ,, 



4th „ 



d „ ? 



1st Abdominal 

 Limbs 



5th „ 



( 5th ,, 



5th ,, 



d „ 



2nd „ „ 



6th „ 



( 6th „ 



6th „ 



a „ <? 



3rd ,, „ 



7th „ 



j 7th „ 



7th „ 



t Pleopods 



4th „ „ 



8th „ 



1 8th „ 



8th „ 



^ » 



5th „ „ 



9th ,, 



( 9th „ 



9th „ 



i M 



6th „ ,, 



10th „ 



( 10th „ 



10th „ 



i „ 



7th „ „ * 



11th „ 



(11th ,, 



nth „ 



1 „ 



8th „ ,,c? 



12th „ 



(l2th „ 



12th „ 



'^opods 



1 



Eeduced Limbs 



13th „ 



13th „ 





; Cercopods 



Cercopods 



Limbless Seg- 

 ment 



14th „ 



ual Segment \ 



Anal Segment 



Anal Segment 



Anal Segment 



15th „ 



Ison 1 









Genital Hmbs d ? 

 Anal Segment 



The signs c? ? indicate the positions of the male and female genital openings, lespectivelj". 



