136 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



FIG. 118. BATH YNOMUS GiGAXTErs (AFTER EDWARDS AND BOUVIER). a, LEFT ANTERIOR 

 (VENTRAL SIDE). 1>, EXTREMITY OF BRANCHIAL TUFT, c, LEFT ANTERIOR PLEOPOD (DORSAL SIDE). 

 <l, CIRCULATION IN RESPIRATORY ENDOPODITE. e, LEFT UROPOD (INFERIOR SIDE). /, LEFT PLEOPOD 



OF THIRD PAIR WITH THE TRUNKS OF THE ORIGIN OF THE BRANCHIAL TUFTS. (/. POSTERIOR LEFT 

 PLEOPOD (ANTERIOR SIDE), h, THE SAME (POSTEBIOR SIDE). 



