GALEORHINUS ANTARCTICUS. 175 



a low blunted apex on each side of which there is a shallow concave indentation, 

 weaker on the inner side, apex more produced near the symphysis of the jaws. 

 Pectoral large, subfalciform, outer angle produced, blunted, rear3hing below half 

 or more of the dorsal base, inner angle about 90°, hind margin a deep concave. 

 Origin of the dorsal little in front of the inner angle of the pectoral, base half as 

 long as the interdorsal space, fin high, upper angle blunted, upper half of hind 

 margin nearly vertical, hinder angle produced, not reaching a vertical from the 

 ventrals by a length of the orbit. Second dorsal shaped like the first, base three 

 fourths as long, or less than the distance from the caudal. Anal half as large as 

 the second dorsal, base two thirds as long, origin below middle of second dorsal 

 base, hind margin deeply indented, ends about half the length of the orbit farther 

 back than those of the fin above it. Caudal as long as the head to the hindmost 

 gill opening; subcaudal lobe moderate, with a concave hind margin. 



Back ashy to greyish or olivaceous brown ; whitish to yellowish below. 



Gulf of California; Panama. 



GaLEORHINUS ANTARCTICUS. 



Mustelus antarcticus Gunth., 1870, Cat. fishes Brit, mus., 8, p. 387; Parker, 1882, Trans. N. Z. inst.. 

 16, p. 219, pi. 30; McCoy, 1884, Zool. Vict., 9, pi. 87; Parker, 1889, Trans. N. Z. inst., 22, p. 331, 

 pi. 19; Waite, 1904, Mem. N. S. Wales nat. club, no. 2, p. 7; 1907, Rec. Canterb. mus., 1, p. 7; 

 1909, Rec. Canterb. mus., no. 2, p. 10, pi. 14, f. 2. 



Head rather broad; snout broad, obtuse, in length about equal to width of 

 mouth. Front edges of nostrils in the mid length of the snout; anterior valve 

 with a somewhat produced and broadly rounded lobe. Mouth large, length equal 

 that of orbit, width twice as much. Teeth smooth, broader than long, without 

 a produced cusp but slightly concave on both outer and inner edges. Orbits 

 less than half as long as the snout, with a nictitating fold. Width of largest 

 gill opening half that of the mouth, smallest opening above the base of the pe^-- 

 toral. Pectorals large, width two thirds of the length, outer angle produced, 

 blunted, fin applied to the side subtending nearly the entire base of the dorsal, 

 inner angle rounded, hind margin concave. Dorsal origin above the inner angle 

 of the pectoral, base equal nearly half the distance from the second dorsal, hind 

 angle much produced but not quite reaching a vertical from the ventrals. Second 

 dorsal base about equal to that of the first, fin smaller. Anal much smaller than 

 second dorsal, origin below the middle of the latter's base, length less than the 

 distance from the caudal. Caudal nearly one fifth of the total length ; subcaudal 

 lobe as long as the orbit, slightly blunted. 



Ashy or greyish brown; white below. 



