I(i0 OAUIUUNIA ACADEMY OF SCIKNCE8 



bearinjj a \veII-dcvelo|je(i, Ixickwarclly dirccteii spinous process. The lower caudal lol>e is slit^luly 

 Ionj;er than the upper; the margin is concave rather than truncate, when the fin is spread. The |x.-c- 

 torals are very sliort, reachinjj to or sh).jlitly beyond the vent in adults, a little Ioniser in the youn^. 

 The fin is sharply aiij,'ulated above, the third and fourth rays the lonjjest; the jwsterior niarj^in from 

 the fourth to the ninth rays is vertically truncate or slightly emarginate; the whole contrasting strongly 

 with the evenly roundetl fin of P. horrens. The det;iched rays are short, the up])er not nearly reach- 

 ing the tips of the vcntrals. 



The dorsal contains invariably to spines and 12 soft rays; the anal has 11 rays in all ui the 

 eighteen sjxicimens examined, except in one which had 10. 



Color in sjiirits: dark brown on back and sides, white below; a faint ill-defined dark bar 

 under spinous dors;»l, and one slightly more distinct under posterior half of soft dorsal. Gill-cavity 

 blackish. Dorsals translucent, the spinous dorsjil blackish toward tip anteriorly; posterior [xirt of soft 

 dorsiil dusky at Ixise, the fin with a more or less ilistinct blackish margin, which does not involve the tips 

 of the rays. Caudal translucent dusky on basid portion, with faint dark blotches arranged in one or two 

 irregular cross-rows. In the terminal third, the rays become charged with much white pigment and 

 the intervening membranes are black. Anal and ventrals translucent, unmarked. Pectorals dusky 

 on Ixisal half, becoming blackish toward midiUe of fin. The distal half of the third to the ninth rays 

 with a broad whitish bar, broadly margined with black. 



This species is now known from Panama, Mazatlan and Albatross Station 

 3041 (Magdalena Bay, L. C). 



