542 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



The depth at the nape is equal to the length of snout; the width of 

 head measured between the crests of the subopercular ridges is 

 slightly greater than length of snout. The tip of the snout is injured, 

 but there appears to have been two terminal spines, each of which is 

 followed by a short lateral spine, and these in turn followed by a 

 series of very narrow, slightly diverging, rugose ridges, several of 

 which converge and unite at the bases of a pair of closely apposed 

 spines, which are a little nearer eye than tip of snout. Other ridges 

 pass backward and end just above the tubular nostril, while others 

 more ventrally located pass backward along the edges of lower 

 jaw. Orbital crest arched somewhat above contour of head, with a 

 strong spine on its upper posterior part; interorbital space broadly 

 concave; the lateral ridges well separated. Occiput with two par- 

 allel crests, each ending in a high, flat spine which is similar to the 

 succeeding ones on the nape and body; surface of the occipital region 

 between the crests concave and smooth. On the orbital margin, 

 below and posterior to the larger spine is a smaller spine marking the 

 anterior end of a curved ridge which passes backward and ends at a 

 point directly above gill opening. Lower rim of orbit with a row of 

 fine denticulations. Side of snout with a prominent ridge ending in a 

 spine below posterior margin of pupil; a small spine on snout above 

 the ridge. Lower border of preopercle with a pronounced ridge; sub- 

 operclc with two ridges, the upper much higher and sharper, both end- 

 ing in flat, blunt spines. Mouth broad, the maxillary extending to a 

 point beneath anterior margin of eye. A group of four or five barbels 

 on each side beneath tip of snout; posterior edge of maxillary with a 

 group of about ten barbels, the posterior pair of which are much 

 longer than the others; lower lip with a pair of small barbels near the 

 middle on each side; none at the symphysis. Each angle of the body 

 armed with a row of strong spines as is usual in the genus. Plates 

 with radial striae. 



Spinous dorsal inserted just behind the fourth row of dorsal plates, 

 the base including the membrane extending over ten of them; one 

 row between the spinous and soft dorsal; soft dorsal located on twelve 

 rows. First dorsal spine highest, 2.5 in the head; the others gradu- 

 ated in length to the last which about equals the diameter of pupil; 

 longest (first) dorsal ray 2 in head. Origin of anal just posterior to a 

 vertical through base of last dorsal spine; the middle rays longest, 2 

 in head. Caudal 1.7 in head, the margin slightly concave. Upper 

 pectoral rays longest, 1.25 in head; the succeeding rays shorter until 

 the fourth from below which is elongate, the following 3 in turn 

 growing shorter; the 5 lower rays somewhat thickened, the membrane 

 deeply scalloped between their tips. Ventral rays 2, their length con- 

 tained 3.3 in the head. 



