PHYLUM ARTHROPOD A 



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 



S. 3". d Maxill« 6.lVMaxilliped 



7. 3 r . d Maxilliped 



8. 3 r . d Leg 



-/"* 



O.Copuldl'ory Organs lO.Swimmlng Foor 



11. Uropod 



FiG. 124. — Typical appendages of Astacus. en. r-j, podomeres of endopodite; 

 ep, epipodite; ex, exopodite; fl, flagella; g, gill; pr. /, pr. 3, podomeres of 

 protopodite; 1-3, podomeres of axis of antennule. (After Huxley.) 



therefore conveniently called itropods or tail-feet. The telson 

 itself bears no appendages. 



