TABLE OF CONTENTS. 



Page. 



List of illustrations xi 



Introduction 1 



The distribution of the North Pacific Ophiuroidea 7 



Geographical distribution 7 



Bathymetrical and temperature distribution 13 



Assoc iational distribution 17 



Conclusions as to distribution of Ophiurans in North Pacific Ocean 22 



Descriptions of species 23 



Family Ophiodermatidse 23 



Pectinura anchista 23 



Ophiarachnella gorgonia 25 



megalaspis 25 



Ophioconis diastata 27 



papillata 28 



Family Ophiolepididae 30 



Ophioplocus imbricatus 30 



japonicus 30 



Ophiozona elevata 31 



longispina 33 



platydisca 34 



polyplax 35 



projecta 36 



Genus Ophiura 36 



Ophiura kinbergi 37 



sarsii 37 



liitkeni 45 



micracantha 47 



maculata 49 



leptoctenia 51 



quadrispina 55 



bathybia 58 



flageilata 60 



imbecillis 62 



irrorata 62 



clasta 64 



monostoecha 65 



calyptolepis 67 



cryptolepis 69 



nodosa 70 



sculpta 73 



etuwitzii 73 



oediplax 74 



V 



