LIGHT PRODUCTION IN CEPHALOPODS. 



Family OCTOPODOTEUTHID^E. 



Genus OCTOPODOTEUTHIS Rtippell, 1844. (Photogenic organs on ink sac?) 



i species: sicula. 

 Genus Oclopodoteuthopsis Pfeffer, 1912. (No photogenic species known.) 



i species. 

 Genus Cucioteulhis Steenstrup, 1882. (No photogenic species known.) 



i species. 

 Family HISTIOTEUTHID^. 



Genus CALLITEUTHIS Verrill, 1880. (Numerous photogenic organs in integu- 

 ment of arms, head, and mantle; best developed ventrally.) 

 12 species: asteroessa, chuni, dofleini, goodrichi, hctcropsis, hoylei,japonica, 



meleagroteuthis, meneghini, miranda, ocellata, separata, verrilli. 

 Genus HISTIOTEUTHIS d'Orbigny, 1839. (Photogenic-organs as in Callileuthis.) 



i species: bonnellii. 

 Genus HISTIOCHROMIUS Pfeffer, 1912. (Larval form; photogenic organs in 



integument of mantle on ventral aspect?) 

 i species: chuni. 

 Family BENTHOTEUTHID.E. 



Genus BENTHOTEUTHIS Verrill, 1885. (Photogenic o.gans on arms ) 



i species: megalops. 



Genus CTENOPTERYX Appellof, 1889. (Photogenic organs on eyes.) 

 i species: siculus. 



Superfamily Ommastrephoidea. 

 Family Brachioteuthidce. (No photogenic species known.) 



Genus Brachioteuthis Verrill, 1881. (+ Tracheloteuthis Steenstrup 1881.) 



4 species. 

 Genus Cirrobrachium Hoyle, 1904 (?) 



1 species. 

 Family OMMASTREPHID.-E. 



Genus Illex Steenstrup, 1880. (No photogenic species known.) 



2 species. 



Genus Todaropsis Girard, 1889. (No photogenic species known.) 



1 species. 



Genus Ommastrephes d'Orbigny, 1835. (No photogenic species known.) 



6 =b species. 

 Genus Nolotodarus Pfeffer, 1912. (No photogenic species known.) 



2 species. 



Genus HYALOTEUTHIS Gray, 1849. (Photogenic organs in ventral integument 



of mantle.) 

 i species: pelagicus. 

 Genus Sthenoteuthis Verrill, 1880. (No photogenic species known.) 



4 species. 

 Genus Symplectoteuthis Pfeffer, 1900. (No photogenic species known.) 



i species. 



Genus EUCLEOTEUTHIS Berry, 1916. (Bands of photogenic tissue on ventral 

 aspect of head and mantle.) 



1 species: luminosa. 



Genus Dosidicus Steenstrup, 1857'. (No photogenic species known.) 



2 species. 



