MONOGEAPH OF JAPANESE OPHIUEOIDEA. 353 



Asteromjx, Asteroschema, Asteroporpa, Ophiomyces, 

 Ophiologimus, Ophiopora, Ophiolimna, Ophiomiirella, 

 OpUacantheUa, Ophiothamnus, Ophiurotliamnus, Ophio- 

 plinthaca, Ophiomitra, Ophiocamax, Amphilepis, Ophi- 

 actis, Amphioplus, Amphichilus, Ophiophragmus, Opino- 

 centrus, Ophiothrix, AmpkiopJmira , OjMomusium, 

 Ophiozonella, Ophiolepis, Ophioleuce, Ophiermis, Ophiu- 

 roconis, Bathypedimira, Pectinura, Ophioplax, Ophio- 

 nereis^ Ophiocoma. 

 37 genera : i2%. 

 IV. Indo- Pacific genera, which are distributed in the Indo- 



Pacific, with the centre of distribution chiefly in the 



vicinity of Malaysia. The following genera belong here. 

 Astroceras, Trichaster, Euryale, Astrocharis, Astro- 

 dendrum, Astrocladus, Astrohoa, Astrothamnus, Astro- 

 toma, Astroclon, Ophiamhix, OpJiiojMmlmus, Ophio- 

 mœris, Amphiacantha, Ophiomasa, Ophiothela, Astro- 

 phiura, Aspidophiura, OpUoplocus, Ophiotroclius, 

 Ophiurodon, Opliiarachna, Ophiarachnella, Ophiochiton, 

 Ophiodoris, Ophiomastix, Ophiarthrum. 

 27 genera: 30X. 

 V. Honshit genera, which are known only from the vicinity 



of Honshu, Shikoku and Kiushii. The following genera 



belong here. 



Ophiostyracium, Ophiosyzygus, OpUostiha, Ophiohyalus, 



Ophiohymen, Ophiophrixus, Ophiosmilax, Astrothorax, 



Ophiophrura, Ophientrema, Ophiocrasis. 



11 genera: 13%. 



With the exception of OpMophthalmus, which is both tropical 



and Arctic, the Indo-Pacific and Intertropical genera are represen- 



