Light cells 



Chromatophores 



organ 



Nerve cord 



Fig. 13.14. Photophores of Oegopsid Squid 



(a) Mantle light organ of Abraliopsis morisii (from Chun, 1910); (b) brachial light 

 organ of Watasenia (.after Dahlgren, 1916.) 



m.a.— 18* 



