296 



BULLETIN OP THE BUREAU OP FISHERIES. 



The young are quite different in general appearance, but are not easily confused with any of the 

 other species inhabiting the same region. Besides other features which are in the main obviously 

 due to juvenility, they differ from the adults chiefly in the much shorter, broader, more rounded fins 

 which gradually assume the typical sagittate outline as they increase in size. A well-advanced embryo 

 is shown in plate xliu, figure 5. 



The more important dimensions of the type, two cotypes, and one other specimen, are appended 

 in the annexed table. 



Measurements of Loligo opalescens. 



Total length, excluding tentacles. 

 Length of mantle (dorsalj 



Fins at plane of attachment. . 

 Width of body 



Across fins 



Of head 



Length of dor-^al arm 



Second arm 



Third arm 



Ventral arm 



Tentacle 



Tentacle club 



Type, no. 2076 of the invertebrate series in the collection of vStanford University, a male. Cotypes 

 in the U. S. National Museum and in the author's collection. 



Type locality, Puget Sound, Washington (shrimp fishermen), 3 specimens. 



Distribution: Washington — Puget Sound, near Deception Pass. California — Monterey Bay, San 

 Diego. 



Three hundred and thirty-six specimens, mostly in a rather indifferent though recognizable state 

 of preservation, have been inspected. 



Specimens of Loligo opalescens. 



