88 



short processes from the anterior end of the body cannot really be regarded 

 as antero-lateral arms, partly because the irregular rods by which they 

 supported cannot be homologous with the anterolateral rods, partly 



are 



because they appear not to be bordered by the vibratile band. The post- 



vam 



Fig. 34. Skeleton of Echinopluteus Iransversus, species e. A. seen from beliind; B. from the 

 dorsal side. "%. abm. abductor muscle, b. body rod; dam. dorsal adductor muscle: 

 pd. posterodorsal rod; po. postoral rod; ptr. posterior transverse rod; str. supplementary 

 transverse rod; vam. ventral adductor muscle; t. thorn; * rudimentary anterolateral rod. 



oral band makes an elegant curve or rather half circle round the whole 

 anal lobe, and then makes a nearly right angle in passing out along the 

 postoral arms. Along the dorsal side it makes a pair of folds. The preoral 

 band is difficult to observe; it passes close along the postoral band, the 



