Plate 39. 



SOME REMARKABLE METHODS OF " COURTSHIP. 



I. The female Argonaut and her egg-casket. 



2 and 3. The male Argonaut and his " hectocotylized " arm. 



4. A Cuttle-fish {Ocyhoe catenulata ^ ), showing the " hectocotylized " 

 arm described in the text, and the " spermatophore " at the base of 

 the long filament. 



[Face page 268. 



