MONOGRAPH OF JAPANESE OPHIUROIDEA. Ill 



Off Manazurn Zaki, Sagami Sea ; 120-265 fathoms (Clark). 



Ophientrema scolojyendviciini (Lyman). 



Opidacantha scolopendrica : Lyman, Bull. Mus. Comp. Zool., X, IS 83, 

 p. 259, PI. VI, figs. 85-87. 



OpMacanllia ( Ophientrema) scolopendrica : Verrill, Transact. Connecticut 

 Acad., X, 1899. p. 332. 



Opiiiaccmtha Jeucosticta : Clark, Bull, U. S. Nat. Mus , LXXY, 1911, p. 

 235, fig. 111. 



Yensliû Sea ; 565 fathoms (Lyman), 507 fathoms (Claek). 



Key to Japanese species of OphiacantJia. 



A — Oral papillse arranged in a single series, 

 a — Single tentacle scale to each x^oi'e» 

 b — Arm spines smooth. 



c — Disk covered with spines or stumpy tubercles. 

 d — Disk tubercles ending with a thorny crown, 

 e — Four to seven arm spines. 

 /—Four arm spines, which are shorter than the corresponding arm 



joint dallasii. 



ff — ^Five or more arm spines, of which the u^^per ones are distinctly 



longer than the corresponding arm joint. 

 g — Five or six arm spines; outer end of the radial shields ■ns^eà..(Bnigmatica. 

 gg — Seven arm spines ; radial shields entirely covered over. 

 h — Outermost oral papilla very large and wide. 

 i — Outermost oral papilla much wider than long ; tentacle scales acute . . 



levisplna. 



ii — Outermost oral papilla longer than wide ; tentacle scales large, flat, 



blunt omoplata. 



M — Outermost oral papilla not especially large and wide. ' 



./ — Oral shields wide, wdth acute lateral angles ; tentacle scales very ^,^ 



small, spiniform and acute pentagona. 



