363 



ARTICULATA : CRUSTACEA. 



FIG. 490. 



SUB-SECTION III. 



THE ORDER OF TETRADECAPODA OR FOURTEEN-FOOTED 



CRUSTACEANS. 



THE living representatives of this group are mostly ot 

 very small size, few attaining even an inch in length. 

 They have seven foot-rings or segments, 

 bearing seven pairs of locomotive append- 

 ages, or so-called feet. The scientific name 

 of the order, it will be seen, means fourteen- 

 footed. 



The ISOPODA from the Greek isos, equal, 

 and poiis, a foot have the body flattened 

 A Tetradecapod- i lor j ZO ntally. and their locomotive append- 



Sand-Flea, Orches- J > rm. jr 



ages or legs very much alike. Iheir lour 

 posterior pairs of legs are in one series, and 



491. 



Isopod, Idotata irrorata, Edwards. 



