204 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser- 



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EXPLANATION OF PLATE XII. 



Skull of Mitsukurina owstoni, gen. et sp. nov. 



Basal bones of first dorsal. 



Basal bones of second dorsal. 



Basal bones of left pectoral. 



Basal bones of left ventral fin. 



Basal bones of anal fin. 



