120 U.S. NATIONAL MUSEUM BULLETIN 2 02 Vol. 3 



Description.— Dorsal rays i,7,i; anal i,8; pectoral rays x; branched 

 caudal rays i,4-|-4,i; teeth (some lost?), upper jaw 7, lower jaw 3. 



Depth of body, excluding dorsal spme and measured at pectoral 

 region, 2.5 (35.1 mm.); depth of body including dorsal spine and 

 measured at that point 2.2 (38.7 mm.); width across dorsal surface 

 3.4 (25.4 mm.); across ventral surface 2.1 (41.2 mm.); head (tip of 

 snout to upper edge of gill opening) 3.3 (26.0 mm.); snout to anus 1.3 

 (63.8 mm.); all in standard length. Snout 1.4 (18.8 mm.); eye 2.5 

 (10.4 mm.) ; interorbital 3.2 (8.2 mm.) ; least depth of caudal peduncle 

 3.3 (8.0 mm.); length of pectoral fin 1.5 (17.0 mm.); length of caudal 

 fin 1.2 (21.9 mm.); height of dorsal fin 1.8 (14.7 mm.); height of anal 

 fin 2.0 (12.8 mm.), gill opening 5.8 (4.5 mm.) ; postorbital part of head 

 6.8 (3.8 mm.) ; dorsal spine (carapace spines all measured to base where 

 ridges of spine are longest before definitely breaking up into rows of 

 papillae around base) 1.7 (14.9 mm.); ocular spines 3.0 to 3.1 (8.8 and 

 8.3 mm.) ; anal spines 2.3 (11.4 mm.) ; all in length of head. Angle of 

 snout profile 47 degrees, snout first convex, then concave, and then 

 convex. 



Body pentagonal in cross section, covered by a carapace formed by 

 firmly united mostly hexagonal plates; carapace with 5 prominent 

 spines, one above each eye pointing directly forward, one on dorsal 

 ridge midway between dorsal fin and eye curving posteriorly, one on 

 each side of anal fin terminating the ventrolateral ridges and pointing 

 directly posterior; dorsolateral ridge bluntly pointed below dorsal 

 spine; gill openings vertical, ventral corner about level with base of 

 second pectoral ray; caudal peduncle with least depth near carapace, 

 increasing gradually in depth to base of caudal without free plates; 

 edges of all fins convex, caudal almost truncate, dorsal and anal 

 tending toward falciform, pectoral falciform with anterior ray longest 

 and posterior ray less than half length of anterior ray; carapace closed 

 behind dorsal fin, all fins rising from separate, skin covered openings; 

 carapace covered by numerous close-set minute papillaelike structures 

 that are largest ventrally and under chin, and absent on spines; spines 

 with fine ridges converging toward tips; ventral surface of carapace 

 more or less flat, convex anteriorly, concave posteriorly; all other 

 surfaces concave, interorbital space concave; scales of sides more, or 

 less hexagonal, 8 or 9 in longitudinal series from gill opening to tail, 

 1 1 in median line of ventral surface (mouth to anus) , 5 from between 

 ventrolateral and to dorsolateral ridges counting obliquely from blunt 

 point of dorsolateral ridge. 



Color in alcohol. — Sides and back with ground color light brown 

 covered with irregular dark brown to black spots and stripes of 

 varying length and pattern, some following the edges of scales, others 

 across scales; large spot behind dorsal fin enclosed parenthetically by 



