UROLOPHUS ARMATUS. 407 



little larger toward the middle of the body or the tail. Total length, of a young 

 example, 85, tail 4l, and greatest width 4^ inches. 



Clouded or rusty brownish; white around nostrils at tip of snout and be- 

 neath the disk. 



Gulf of Cahfornia to Panama. 



Urolophus. 



Urolophus MtJLLER & Henle, 1837, Sitzb. Akad. wiss. Berlin, p. 117. 



Disk subquadrangular, narrower posteriorly, anterior margins waved meet- 

 ing at a blunt angle in front, snout little produced. Ventrals short, broad, 

 anterior rays and posterior subequal, directed backward. Tail shorter than the 

 body, stout, with a spine; caudals short, of moderate depth, rounded behind. 

 No dorsal fin. Papillae at the bottom of the mouth. 



Type U. cruciatus. 



Disk much broader than long 

 tail short 



back spinose, a tubercle on the shoulder girdle 



spotted with black armatus (page 407) 



back smooth, no tubercles 



banded and blotched with dark . . cruciatus (page 408) 

 tail little shorter than body 

 back smooth, no tubercles 



brown, uniform kaianus (page 409) 



Disk about as broad as long 



tail little shorter than body 

 back smooth 



brown on back, white below middle of disk fuscus (page 409) 



Urolophus armatus. 



Urolophus armatus Muller & Henle, 1841, Plagios., p. 174; Dum^ril, 1865, Elasm., p. 628; Gunth., 

 1870, Cat. fishes Brit, mus., 8, p. 485; 1910, Sudsee fische, 3, p. 495. 



Separated from U. cruciatus by broadness of disk, greater production of 

 snout, armature, and by coloration. Mouth sinuous; teeth fiat, in a young male. 

 Scattered spines above the snout, on the back of the head, along the middle of 

 the back and in a row on the tail. A larger spine on the shoulder girdle. 



