170 AET. 2. — H. MATSÜMOTO : 



c — Four or five arm spines, of which the second lowermost is hook-shaped 

 at the tip and microscopically serrate along the concave side ; radial 

 shields small, divergent ; outer end of each genital plate bearing, 

 just distally to the radial shield, a small projection, which is 

 microscopically thorny at the tip ancistrotus. 



cc — Six arm spines, one or more middle ones terminating with a 

 minute, glassy cross-bar ; upper arm plates hexagonal, twice as wide 



as long ; disk unknown hexacanilms. 



A A — Single tentacle scale to each pore. 



d — Three arm spines, of which the uppermost one is the longest and 

 the lowest one the shortest; disk scales rather coarse, with very 

 distinct six primaries ; radial shields very large and wide, divergent ; 

 oral shields very small, triangular; ventral arm plates hexagonal, in 

 contact with each other for a short extent ; tentacle scales large and 



oval cernuus 



dd — Four or five arm spines. 



e — Four arm spines, of which the uppermost and the lowest ones are 

 longer than the middle two ; disk scales fine ; radial shields slender, 

 partly joined in pairs ; interbrachial ventral surfaces covered by a 

 naked skin ; oral shields small, rhomboidal ; ventral arm plates 

 quadrangular, widely in contact with each other ; tentacle scales 



small and crescentic glaucus.. 



ee — Five arm spines, of which the lowest one is the longest ; disk 

 scales fine ; radial shields long and rather narrow, divergent ; oral 

 shields large, pentagonal, much wider than long ; ventral arm 

 plates quadrangular, much wider than long, widely in contact with 

 each other ; tentacle scales small and oval macraspis. 



Arnx*liiopliis inegaxmmus Clark. 



AmpMophiG megapomiis : Clark, BuU. U. S. Nat. Mus., LXXV, 1911, 

 p. 170. 



Oif Eai, Kitan Channel ; 37 fathoms (Clakk). 



