TABLE SHOWING THE NUMEBIOAL COREESPONDENCE I 



6 

 7 

 8 

 9 



10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 



Akachxida. 



Scorpionida. 



Ocular Segment 



Deutocerebral 



Segment 

 Chelicerae 



Pedipalps 

 1st Legrs 



Merostomata. 



Chelicerae 



1st Legs 

 2nd ,, 



Crustacea. 



2nd „ 



3id „ 



4th „ 



Pre-genital Seg- 

 ment 

 Operculum <? ? 



Pectines 



1st Lung-books 



2ad 



3rd 



4tli 



1st Tail-Segment 



Anal Segment 

 Telson 



3rd ,, 

 4th „ 

 Paddles 

 Metastoma 



Operculum <j ? 



1st Gill -plates 



2nd „ 



3rd 



4th 



•5 th 



Anal Segment 

 Telson 



Pycnogonida. 



Trilobita 

 (Olenellus). 



Chelicerae 

 Palps. 



Ovigerous limbs 

 1st Legs ? 



2nd ,, ? 



3rd ,, J ? 



4th „ <? ? 



[Abdomen greatly 

 reduced & con- 

 densed] 



Ocular Segment 



Antennules 



1st Biramous 



limbs of Head 

 2nd „ 



3rd „ ,j 



4th „ 



Leptostraca 



1st Trunk limbs 



2nd ,, „ 



3rd „ 



4th ,, „ 



5th ,, ,, 



6th ,, ,, 



7th „ 



8th „ ,, 



9th „ 

 10th „ ,, 

 11th „ 

 12th ,, 

 13th ,, ,, 

 14th ,, 

 loth ,, ,, 



Anal Segment 



Telson 



Stalked Eyes 

 Antennules 

 Antennae 

 Mandibles 

 1st Maxillse 

 2nd „ 



1st Thoracic 



2nd „ 



3rd 



4th 



.5th „ 



6th 



7th ,, 



8th ,, 



1st Pleopods 



2nd „ 



3rd „ 



4tb „ 



oth ,, 



6th „ 



Limbless Sc 



ment 

 Anal Segme. 



Furca 



The line after Segment 5 indicates the hind-margin of the primitive Arthropodan Head. 



