PHYLUM ARTHROPODA 



217 



and exopodite having the form of broad flat plates ; in the 

 natural position of the parts they lie one on each side of the 

 telson, forming with it a large five-lobed tail-fin; they are 



O.CoJsulafory Organs tO.Swimming Foor 



ll.Uropod 



Fig. 124. — Typical appendages of Astacus. en. 1-5, podomeres of endopodite; 

 ep, epipodlte; ex, exopodite; ;?, flagella; g, gill; pr. I, pr. 2, podomeres of 

 protopodite; 7-5, podomeres of axis of antennule. (After Huxley.) 



therefore conveniently called uropods or tail- feet. The telson 

 itself bears no appendages. 



