W. <r. STEVENSON. 95 



exposed; and a third row is partially exposed as it rises 

 above the enclosing tissues, of the deep groove in either 

 jaw, which conceal several other rows of rudimentary 

 teeth. 



FINS. 



The pectorals, twenty-six inches behind the snout, are 

 of medium size, with a basal diameter of six and one 

 half inches, and a posterior basal lobe two and one half 

 inches in anterio-posterior diameter. Their general form 

 is triangular or sub-falcate, with an anterior margin en- 

 tire, convex, and thirteen inches long, and a posterior 

 margin somewhat repand and ten and one half inches 

 long. 



The first dorsal, forty-eight inches from the snout, is 

 live and one half inches high and eight inches long at 

 base. 



The second dorsal, fifteen inches behind the first dor- 

 sal, is the same form and height as the first dorsal, with 

 a nasal diameter of six and one half inches. 



The ventrals are of medium size and anterior to the 

 second dorsal. 



The anal is nearly underneath the second dorsal, and 

 is of the same size and form. 



The caudal fin has an upper lobe, twenty- three inches 

 long, notched near its top on the posterior border, and a 

 small lobe at the base. 



The caudal peduncle has no keel. 



BEANCHIAL OPENINGS. 



The gill-openings, five in number, are lateral, of mode- 

 rate size, and entirely anterior to the pectorals. The 

 third or middle branchia is eight and one half inches 

 long, and the other four are each seven and one half 

 inches long. 



The inter-branchial space, sub-thoracic, is fourteen 

 inches. 



-U7 



