ThAbvatfe of rf.M.S ' Challenger: 



IWholurin PI. 53. 



1 -1 ARCHICAPSA , ;;-<;.HAUCAPSA, 7 PLATYBURSA, 



8 CLATHROBURSA , 9.10 ARCHIPERA, 11 12 ARCHISCENIUM , 13 CLADOSCENIUM, 



14-16 PTEROSCENIUM , W.18 ACROCORONA, 19.20 TETRACORETHRA. 



