PLATE XV. 



Class MYZOSTOMEA. 



Myzostoma. 



FIGS. 1, 2. CYSTS ON THE ARMS OF CKINOIDS CONTAINING MYZOSTOMIDA. 

 (After von Graff.) X 1. 



FIG. 3. MYZOSTOMA : VENTRAL ASPECT, x 5 - 

 FIG. 4 MYZOSTOMA : DORSAL ASPECT, x V- 



FIG. 5. A DIAGRAM TO REPRESENT THE ORGANISATION OF MYZOSTOMA. (From 

 Sutton, modified from von Graft".) 



p. proboscis ; i. branched intestine : t. testis : o. ovary : r. rectum : 

 c. cloaca: s.^-s.* suckers: p. l -p. 5 parapodia. 



