Measurements of Ommastrephes illecebrosa , males, (in inches). 
278 
A. E. Yerrill — North American Cephalopods. 
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Locality. 
Sex and designation, 
End of body to edge of mantle, above, . . 
End of body to edge of mantle, beneath, _ 
End of body to origin of fin 
End of body to center of eye. 
End of body to base of dorsal arms, 
Eye to tip of dorsal arms, 
Eye to tip of 2 d pair of arms, 
Eye to tip of 3 d pair of arms, 
Eye to tip of 4 tli pair of arms, 
Eye to tip of tentacnlar-arms. . . 
Breadth of head across eyes, 
Breadth of head in front of eyes, 
Breadth of body, 
Breadth of caudal fins, 
Circumference of body, 
Length of tentacular-club, 
Diameter of largest suckers of club, 
Of largest suckers on 3 d pair arms, 
Ratio of fin to length of mantle, 1 : 
Breadth of fin to length of mantle, 1 : 
