6io 



MADOKA SASAKI : 





Male 



T cmale 





mm. 



mm. 



Dorsal length of mantle 





215 



Ventral length of mantle 



165 



164 



Breadth of mantle 



no 



1 10 



Mantle-extent from fin in side 



5 



2 



Breadth of fin 



23 



25 



Length of first arm (right) 



91 



90 



„ „ second arm (do) 



89 



88 



,, ,, third arm (do) 



80? 



88 



„ „ fourth arm (do) 



9 2 



94 



,, tentacle (do) 



3i° 



400 



Diameter of largest arm-sucker 



3 



3 



„ „ tentacular sucker 1.5 1.5 



Breadth of shell 80 80 



Remarks. The species standing in nearest relationship to the 

 present one is S. aculeta Van Hasselt. The two species differ from 

 each other in following respects : 





Sepia sabaculeata. 



Sepia aculeata. 



Arm-order : 



4. I. 2. 3. 



4, 3. 2, I. 



Posterior end of 

 mantle : 



bluntly terminating. 



somewhat acuminated. 



Tentacular stalk : 



thick, 



somewhat thin. 



Tentacular suckers : 



somewhat large, being arranged 

 in 8 longitudinal series, 



small, being arranged in 10 or 

 12 alternate series. 



Dorsal surface 

 of sheU : 



without a distinct longitudinal 

 furrow, 



with 4 longitudinal furrows. 



Ventral surface 

 of shell : 



with a deep median furrow, 



without a median furrow. 



Rostrum of shell : 



very short and thin, 



long and thick. 



