156 S. STILLMAN BERRY. 



Family Argonautidcs. (No photogenic species known.) 

 Genus Argonauta Linnaeus, 1758. 



12 species. 



Family Tremoctopodida. (No photogenic species known. 1 ) 

 Genus Tremoctopus delle Chiaje, 1829. 

 Only i certainly established species. 

 Family Alloposidce. (No photogenic species known.) 

 Genus Alloposus Verrill, 1880. 

 2 species. 



Superfamily Amphitretoidea. 



Family Amphitretidce. (No photogenic species known.) 

 Genus Amphitretus Hoyle, 1885. 

 i species. 



Superfamily Polypodoidea. 

 Family BOLIT/ENID.E. 



Genus Bolitcena Steenstrup, 1859. (No photogenic species known.) 



i species. 

 Genus ELEDONELLA Verrill, 1884. 



5 species: (i species, alberti, described as " probablement photogene")- 

 Genus Vilreledonella Joubin, 1918. (No photogenic species known.) 



i species. 



Family Polypodida. (No photogenic species known.) 

 Genus Polypus Schneider, 1784. 



125 species. 

 Genus Tritaxeopus Owen, 1881. 



i species. 

 Genus Pinnoctopus d'Orbigny, 1845. 



1 species. 



Genus Scaurgus Troschel, 1857. 



4 species. 

 Genus Cistopus Gray, 1849. 



2 species. 



Genus Moschites Schneider, 1784. 



3 species. 



Genus Graneledone Joubin, 1918. 



9 species. 

 Genus Eledonenta de Rochebrune, 1884. 



2 species. 

 Genus Velodona Chun, 1915. 



i species. 



The increase afforded by the present list over the numbers 

 included in the earlier catalogs of photogenic cephalopods is 

 quite remarkable for the small number of years that has elapsed. 

 Hoyle's list (:o8, p. 14) records as photogenic 6 families, 26 

 genera, and 30 species of (Egopsida, i family, 3 genera and 3 

 species of Myopsida, and none of the other groups, or a total 



1 But cf. Tryon, '79, p. 131. 



