MONOGllAril OF JAPANl«]«: OrniUROlDKA. 213 



by very narrow spaces, whero the ventral ends of the lateral 

 arm plates arc wedged in. Tlie ventral arm ])lates are often 

 divided into halves along the median line. Arm spines six or 

 seven near the base, live or six in the middle part of the ai'ms, 

 peg-like, flattened, binnt, longer downwards, nearly equal to, or 

 slightly longer than, tlie corresponding arm joint ; much flattened 

 and thorny at the end, except the uppermost one or two ; the 

 second one from below is spur- shaped and very thorny. Tjarge 

 tentacle pores, unprotected. 



Colour in alcohol brown; the scales around the radial shields 

 are lighter ; arms grayish brown to gray in the outer parts. 



Tliis species is very near to A. phdlerala (IjYMan, 1874) but 

 differs from it in tlu^ much larger radial shields, in the not oval 

 but pentagonal oral shields, in the adorai shi(3lds being joined 

 neither radially nor interradially, in the more projecting oral 

 angles, in the dorsal arm plates being in contact witli one another, 

 in the ventral arm })lates being separated from one another and 

 not very wide basally, and in the not cylindricnl l)ut much 

 llattened and thorny arm spines. A. vadlcola differs from A. 

 ecnomiotata Clakk in the exceedingly long arms, in the shape of 

 the dorsal and ventral arm plates, and in th<3 f(iW(îr arm spines. 



Aiujß/tiura ecnoniiotata Clark. 



Ampkiura ccnomiofatn : Clark, Bull. U. S. Nat. Mus., LXXV, 1911, i). 

 US, fig. 51). 



Off' Seno-umi, »Suruga Gulf; 31 41 fathoms (Ci.AiiK). 



Opliiocentrus verticillah^s (1)öderli]in). 

 OpMocnida vertlcUlata : Dodiîrlein, Semon-Zo(j1. Forschuiigsr. Ausb'. 



