I IO 



MADOKA SASAKI. 



sometimes thickened into an irregular shape ; papillär)- area very narrow 

 and thin, surrounded by glandular radial muscles. Suckers in all arms, 

 thickly arranged in two series of about sixty-five each. 



Tentacles slender, with cylindrical stalk, the distal half forming a thick, 

 club, which tapers gradually towards tip and is a little flattened in the 

 proximal parts but distali)- changes into cylindrical ; protective membrane 

 broad, supported by numerous distinct muscular ribs. Suckers depressed,, 

 oval, very obliquely attached ; aperture very wide, oval, with distal margin 

 distinctly notched. Suckers in the proximal parts of club in oblique rows 

 of four each ; distali)- the number of suckers in each row gradually 

 increases up to about twenty-four. At the same time the suckers grow 

 smaller ; while the proximal suckers are about as large as the largest 

 sucker of arms, those at tip of club are very minute and scarcely visible to. 

 the naked eye. Horny ring with about ten, blunt, short, outwardly 

 directed teeth along the distal edge ; often showing some horny noxes of 

 varing sizes in some part of the margin. The noxes well developed in 

 proximal suckers, generally covering up the entire edge as well as all the 

 teeth ; especially so in largest suckers in which the noxes fuse together 

 into an irregularly tubcrclcd thick mass along the entire margin of horny- 

 ring (PI. Ill, figs. 2-5). 



In the mantle cavity, there exists a pair of elongate elliptical glandular 

 organs in the middle of the inner surface of ventral mantle. This organ 

 seems to constitute an important characteristic of this species ; it has, so far 

 as I am aware, never been before noticed in any other known cuttlefish. 



Color purplish brown all over. 



Radula and gladius not examined. 



The type specimen, preserved in alcohol, was captured by Mr. K. Aoki 

 in Sagami Sea, outside the Okinosé bank from a depth of about 400 fathoms.. 

 The principal measurements are as follows : 



Dorsal length of mantle 238 mm. 



Ventral length of mantle 235 „ 



Breadth of mantle , 65 » 



