Plate 84. 

 1, 2. Pilematechinus Rathbuni A. Ag. ; Station 3374. 



1. Same specimen as PI. 83, fig. 2, seen facing the anal system and the odd posterior 



interambulacrum. 



2. Tlie same specimen, in profile, seen facing the right posterior interambulacrum (PI. .S2. 



fig. 1). 



Both figures natural size. 



