Plate 62. 



Alimentary canals of Echinothurids, removed from the tests, natural position, seen 



from below. 



1. Asthenosoma Ijimai Yosh. 



2. Phormosoma bursarium A. Ag. 



3. Bchinosoma hispidum Mortens. 



4. Sperosoma obscurum A. Ag. and CI. 



All figures natural size. 



