Opisthoteuthis calif orniana — PEREYRA 
433 
Fig. 3. Behavior of live Opisthoteuthis calif orniana in an aquarium, a-d, swimming off bottom; e-f, set- 
tling back to bottom. 
the vessel rolled, flapjack devilfish moved back 
and forth in the aquarium. A small Octopus 
sp., placed in the aquarium at the same time, 
had no trouble "hanging on" or clinging to the 
aquarium. The inability of the flapjack devilfish 
to attach to the aquarium glass, even though 
the males possess many greatly enlarged suck- 
ers, sheds more light on the degeneracy of this 
cephalopod group and allows questions as to 
the function of these enlarged suckers. Assum- 
ing that these animals behaved normally despite 
the fact that they had been brought to the sur- 
face, it would not seem that this cephalopod can 
apply itself to a rock as stated by Borradaile 
et al. (1935:602), or attach to a projecting 
substratum as stated by Ijima and Ikeda ( 1895: 
