ON A NEW SPECIES OF OEGOPSIDS 



FROM THE BAY OF TOYAMA, 



GONATUS SEPTEMDENTATUS. 



By 



Madoka Sasaki, Rigakuslii. 



1=1 



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M ^ ± f^ -^ tK 



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This cuttle-fish is often caught with drag-net at lOO fathoms or more along the 

 coast of EtchCi Province, where it is commonly called "Dosn-ika''^ by the fishermen. 

 All the specimens (in formalin) which came under my observation were females, 

 and their measurements were as follows : 



Dorsal length of mantle 

 Ventral length of mantle 

 Circumference of mantle 

 Breadth of mantle 

 Length of head 

 Breadth of head 

 Leneth of fins 



Length of first arm 

 ,, ,, second arm 

 ,, ,, third arm 

 ,, ,, fourth arm 



Length of tentacle 

 „ ,, club 



Length of nidamental eland 



mm. 



138 

 130 

 1 12 

 40 

 40 

 42 

 80 



mm. 

 164 



15s 

 125 



50 



43 

 48 



94 



mm. 

 185 



174 



132 



48 

 40 



105 



mm. 

 220 



210 



170 



55 

 48? 



51? 

 134 



mm. 

 190 

 179 



^35 

 48 



42 



43 

 1 10 



left right left right left right left right 



70 70 82 81 79 76 88 88 



78 — 94 93 93 90 98 98 



70 — 90 89 — 92 95 97 



65 — 82 82 78 78 87 84 



X 90 — 1 20 1 2 5 1 1 5 1 1 5 1 60 1 60 



80 — 70 70 65 65 80 80 



25 35 35 35 



left right left right 

 ■ 103 103 



— — io8 108 



— — 108 107 



— — 102 102 



— 200 2O0 



— — lOO 100 

 50 



The measurements of the gladius of a specimen with the 



mantle-length of 



