332 AET. 2. — H. MATSUMOTO : 



large, triangular, long, tapered within to an acute point, where 

 they do not meet. Oral plates naked. I'ive oral papilla) ; outer- 

 most one long, acutely pointed within ; the second is the largest 

 of all, \ery wide and flat ; the others small, somewhat conical, 

 obtuse. Four or five teeth, very large, with rounded ends, except 

 the uppermost one, which is longer than the others and 

 pointed. 



Arms long, slender, thin. Lamellar plates and line granules 

 occur on the dorsal and lateral surface of 1:he arm bases. First 

 one or two dorsal arm plates small, partly covered over by the 

 lamellar plates. Those beyond triangular at tlie outset but be- 

 coming quadrangular a little further out, with rounded outer 

 corners and curved lateral borders, wider than long, wider without 

 than within. Lateral arm plates not very prominent. First ventral 

 arm plate small, triangular, with rounded angles, nearly as wide 

 as long. Those beyond pentagonal, with an inwardly directed 

 angle, which is covered by the preceding plate ; outer border 

 curved, lateral borders concave and l^ounded by the tentacle pores. 

 Three arm spines, conical, tapering, obtuse, a little longer than 

 the corresponding arm joint, subequal, but the middle one slightly 

 longer than the other two. One tentacle scale on the abradial 

 side of the pore, very large and oval. Besides, on the adradial 

 side of a few basal pores, there occur one or two rudimentary 

 tentacle scales, more or less covered over by the abradial scale. 



Colour in alcohol : yellowish gray above and white below ; 

 arms banded with dark gray. 



It is recorded that the above specimen was taken with a 

 coral net, but the depth is not stated. As the annulation on the 

 arms indicates, this species is not a deep water form, but probably 

 sublittoral. 



