190 AKT. 2. — II. MATSUMOTO : 



pair distinctly exceeds the width of the corresponding arm base. 

 Interbrachial ventral surfaces covered also with imbricating scales, 

 which are much finer than those of the dorsal side. Genital slits 

 long. 



Oral sliields rhomboidal, with acute inner and rounded lateral 

 and outer angles, inner sides longer than the outer ; slightly longer 

 than, or nearly as long as, wide. Adorai sliields triangular, long, 

 tapered inwards, meeting with each other within. Three oral 

 papilla3 on either side, the inner two are I'ounded, and the outer- 

 most one is very large, wide and operculiform. Teeth quad- 

 rangular and stout. 



Dorsal arm plates triangular, with rounded outer lateral 

 angles and convex outer side, one and a half times as wide as 

 long, shorter than the corresponding arm joint, so that the succès- 

 sive plates are not in contact with each other. Lateral arm plates 

 low, flared outwards, those of the two sides slightly meeting with 

 each other both above and below. First ventral arm plate 

 exceedingly sm.all, pentagonal, longer than wide. Those beyond 

 pentagonal, with rounded outer lateral angles and convex outer 

 side, wider than long, widest at the inner lateral angles, not in 

 contact with each other, except the first two or three plates. 

 Three, or sometimes four, arm spines, of which the uppermost is 

 usually the longest, and tlie middle one is the shortest and 

 stoutest and is distinctly compressed at the base. Two very 

 small, oval, flat, leaf-like tentacle scales, of which the adradial 

 one is slightly larger than the al^radial. 



Colour in alcohol : wählte or yellow, except the dorsal side of 

 the disk, which is light bluish ; radial shields with a white spot 

 at the outer end, as in A. squamaia and A. japonica. 



The present species is very near to A. japonica, but diiEfers 



