Plate B. 



1. Phormosoma hispidum A. Ag. ; 54 mm. in length, seen from the aetinal side, natural 



size ; Station 3376. 



2. Pourtalesia Tanneri A. Ag. ; 17 mm. in length, seen in profile ; Station 3431. 



3. Cystechinus Loveni A. Ag. ; 88 mm. in length, seen facing the right anterior lateral 



ambulacrum, natural size : Station 3415. 



