42 K. MITSUKURI AND S. IKEDA. 



been subequal, there was a difference of 35 on. between the longest of 

 these and the fourth arm which was also longer than the head and body 

 together (88 cm.). 



The proxmial half of each arm was nearly square in section, while 

 it became gradually compressed towards the tip. Dianieter of section 

 throuf/Ji base of first j^^f^if of (iriiis S cm.; of fonrtlt pair, 4 cm. 



The arms were without any web at their base. 



SucJicrs : Each arm was studded from the base to the tip with 

 two alternating rows of suckers. These were largest on the proximal 

 third of each arm, and became generally giadually smallei' towards the 

 tip. There is again a contrast between the fourth pair of arms and 

 others in the size of their suckers. "While the largest suckers on the 

 first three pairs measured 1 cm. in their longest diameter (irrespective 

 of the horny ring which is smaller), tlie largest on the fourth pair were 

 only ^ cm. across. Suckers were very oblique; campanulate in shape, 

 and supported on rather long, slender peduncles. The thickest part of 

 the oblique suckers was generally on the distal and external side. The 

 peduncle was excentrically attached to the thinner part of the suckers. 

 Each sucker was provided with a horny ring, which was also more or 

 less oblique. In the largest suckers found on the proximal third of the 

 first three pairs, the ring (Fig. 8) was 7-8 nun. cross and was studded 

 with nearly equal teeth on the whole of the upper mai'gin. The teeth 

 on the thicker part of the obli([ue figure were on the whole the largest, 

 and bent inwards towards center of the ring, while those on the op- 

 posite side stood up straight and erect. The rings on medium sized 

 suckers (found on the middle third of the first three pairs and on the 

 proximal half of the fourth pair) were more oblique (Fig. 9) than on 

 those on the largest suckers (Fig. 8). The teeth on these were 

 decidedly unequal, 8-1 'J on the higher part of the oblique ring being 

 prominent for their size and being bent inwards. The rings on small 

 suckers (found on the distal third of the first three pairs and on distal 

 half of the fourth pair) were still more oblique (Fig. 10) ; the prominent 

 teeth on the higher j)art were larger, broader, and fewer, there being 



