MONOGRAPH OF JAPANESE OPHIUßOIDEA. 255 



arm spines, two of wliich are larger and longer than the rest, which 

 are very minute nodosa. 



dd. — Comb papilla? very numerous, spiniform, acute, but becoming blunter 

 and more jflattened as they pass downwards ; secondary comb 

 papillae i^resent, arising from the dorsal and lateral arm plates of 

 the arm base ; about five primary arm spines, which are more or 

 less erect, and about ten secondary ones, which lie flat on the arm, 

 are present on each lateral plate of the free basal arm joints . - 

 sterea. 



cc. — Very numerous arm spines, of which the secondary ones, which lie 

 flat on the arm, are soldered together. 



e. — Three erect primary arm spines, two of which are placed low down 

 and one high up ; between the lower two primary spines lies the 

 lowest secondary spine, which is very large and squarish ; comb 

 papillse very numerous, spiniform, acute, but becoming blunter and 

 more flattened as they pass downwards ; secondary comb papillse 

 present, arising from the dorsal and lateral plates of the arm 



base ; oral shields ovate sladeni. 



ee.—Two erect x^riniary arm spines, one of which is placed low down 

 and the other high up ; comb papillse flat and blunt ; oral shields 

 pear-shaped, much longer than wide hr achy actis. 



Stegophiura striata (Duncan). 



OpUoglyplia striata : Duncan, Journ. Linn. Soc. London, XIV, 1879, p. 

 452, PI. IX, figs. 4-5a; Lyman, Rep. Challenger, V, 1882, p. 77. 

 Sondai Bay, Korean Sea (Duncan). 



Stegophiura vivipara Matsumoto, 



Stegophiura vivipara : Matsumoto, Proc. Acad. Nat. Sei. Philadelphia, 

 1915, p. 79. 



