PLATE I. 



tnthus ambonetisis. Station i8i, Ambon I. Natura! size. 

 int kus su / t ii /us. Station 1S1. Ambon I. Natura] size. 

 ui/luis teedus. Station 85. Natura] size. 

 <iica. Station 172. 5. 

 Apiactis obconica. Station 10. 



nactis pilula. Station 96. 10. 



yceriantkus fimbriatus. Station 1S1, Ambon I. Natural size. 

 Pachycerianthus monos tichus. Station [81, Ambon 1. Natural size. 

 Arachnactis sibogce. Station 205. ■ 10. 

 Arachnactis sibogce. Station 205 bis . X 10. 

 lactis malayensis. Station 172. 5. 

 Trilobed portion of a mesenterial filament of C. fimbriatus. • DL. = distal lobe; gl. = gland 



cell ; M. = median streak; ;/. = nematocyst; PL. = proximal lobe. x 200. 

 Section of craspedoneme of P. fimbriatus. en. = endoderm; DL. = distal lobe; PL =■ proximal 



lob o. 



Section of craspedoneme of C. americanus. 200. 

 Section of the simple portion of a mesenterial filament of 1'. fimbriatus. X 200. 



