NOTES ON OEGOPSID CEITIAI.OPODS FOUND IN JAPAN. 



93 



This is to my knowledge the first case of the species having been ever 

 obtained after it was first described. Both the specimens deviate from 

 Goodrich's original description, which is based on specimens from the 

 Andaman Sea (1896), in the following points : (1) In the Japanese 

 specimens, the second pair of arms is distinctly longer than others and that 

 even than the fourth, while in the Andaman specimens the second is as 

 long as the fourth, both being the longest of all. (2) The distal suckers of 

 first, second and third arms are a little more numerous than as given by 

 Goodrich. The numbers of hooks and suckers in the Japanese specimens 

 are given in the following table : 











Right 



arms 







Left 



arms 











IV 



III 



II 



I 



I 



II 



III 



IV 





Hooks 



13 



13 



14 



13 



12 



13 



13 



14 



Sp. No. I. 



Suckers 



/-Larger 



15 



11 



11 



10 



10 



12 



11 



























^Smaller 







26 



26 



25 



2 5 



24 



24 









Hooks 



*4 



13 



13 



13 



13 



12 



] 3 



14 



Sp. No. 2. 



Suckers 



1 Larger 





11 



11 



11 



10 



12 



11 











(.Smaller 







26 



26 



26 



25 



2 5 



26 







As the Andaman specimens were all females, the hectocotilized arm 

 ' has not been known. I find it resembles in appearance very much that of 

 Abralia vcranyi (Riipp.). The arm is the left ventral. It is provided, 

 along the distal part a short distance from its CNtreme end, with two 

 elongate semilunar membranes which are continuations of the narrow 

 protective membranes of the proximal part. The ventral of the semilunar 

 membranes is situated a little more proximally than the dorsal one. The 

 hooks number fourteen, of which the three terminal ones are situated just 

 opposite the ventral semilunar membrane. The terminal part of the arm 

 beyond the semilunar membranes is smooth and without any sucker. 



The luminous organs of the body surface are not uniform in ap- 

 pearance but may be classified into three kinds as in A. vcranyi : (1) Those 



