MONOGRAPH or JAPANESE OPHIUKOIDEA. 151 



arising entirely from the adorai shield ; no additional 

 papilla just outside and above the infradental one, which 

 therefore is the highest in position of all ; oral slits closed 

 by the oral papillae. 



Ampliioclia Verrill, 1899. 



Ophiophragmus Lilian, 1865. 



Ophiocnida Lyman, 1865. 



III. Three oral papillae on either side, the outermost one 

 being very large and operculiform ; no additional papilla 

 just outside and above the infradental one, which therefore 

 is the highest in position of all ; oral slits closed by the 

 oral papillae. 



Amphipliolls Ljuxgman, 1867. 

 Ophiostigma Lütken, 1856. 



IV. Two, sometimes three, oral papilla3 on either side, the 

 outermost one or two arising from the adorai shield ; one 

 additional papilla is present just outside and above the 

 infradental one ; oral slits gaping. 



Amphiura Forbes, 1842 (= Ophionephthys Lütken, 



1869). 

 Ophionema Lütken, 1869. 

 Ctenamphiura Verrill, 1899. 

 Par amphiura Kœhler, 1895. 



Ophlocentras Ljungman, 1866 {~ Amphiocnida Verrill, 

 1899). 

 I [have dissected several specimens of Ophiactis pteropoma 

 Clark, Hemipholis elongata (Say), OphiophoUs aculeata (Linnf), 

 AmpMoplus ancistrotm (Clark), AmpJiiacantha acanthina (Clark), A. 

 dividua, no v., Ophiophragmus japonicus Matsumoto, AmphiphoUs 

 kochii Lütken, Amphiura korece Duncan, A. trachydlsca Clark, A. 



