3i8 



ZOOLOGY 



broad bodies, and curl themselves up like wood-lice, and in this 

 condition are very often mistaken for the latter. 



Pig. 182. 



1. Head and anterior somites of Siphon- 



ophora portoricensis. After Koch. 



2. Diagram of the arrangement of the 



anterior somites and appendages of 

 a female lulus loTidonensis. After 



a. Modified tergumof the 1st post- 

 oral somite (dorsal plate or coUum). 



b. A short single appendage of the 

 same somite, of four joints and a 

 claw only, turned towards the mouth. 



c. Single appendage of the 2nd 

 somite, of five joints and a claw like 

 the remaining appendages. 



d. 3rd or generative somite, devoid 

 of appendages and sterna, but hearing 

 the generative apertures. 



e. Single appendage of 4th somite. 

 /, g. Dual appendages of succeed- 

 ing somites. 



3. Hook-like postcephalic appendage of 



male of same attached to its plate of 

 support ( = one half of modified 

 sternum ?) 



4. Mandible of same. 



5. The four-lobed plate formed by the 



fused single pair of maxillae. 



Pauropus and Scolopevdrella are genera which are sometimes 

 placed in two different sub-orders, the Pauropidae and the 



FlQ. 183. — Enlarged view of PffiitrqpMS teafeyi. After Lubbock. 



Symphyla, which rank with the Chilopoda and Diplopoda. 

 Pauropus is very small ; it has ten segments, and Eupauropus 



