240 CALIFORNIA ACADEMY OF SCIENCES. 



ing the dorsal plate above, the region anterior to them 

 smooth; the lateral scutes low, almost concealed by the 

 skin, with strong median hooks and sometimes with one 

 or two marginal spines above and below. Accessory 

 rays of the caudal fin greatly enlarged, plate-like. No 

 scutes on back or belly. 



Humeral process narrow and long, reaching the 2d or 

 3d lateral scute, having a single series of hooks in the 

 young, granular in the old, with series of larger granules. 



Distance of the dorsal fin from the snout 2i in the 

 length; dorsal spine an orbital diameter shorter than 

 the head, its posterior margin with a median groove, its 

 sides striate, its anterior margin smooth. Distance be- 

 tween dorsal and adipose fins about equal to the length 

 of the head; the base of the adipose somewhat shorter 

 than the dorsal fin. 



Caudal fin emarginate. 



Anal higher than long, the 4th or 5th ray highest. 



Ventral fins almost or quite reaching the anal. 



Pectoral spine very large and long, reaching beyond 

 base of ventral fins, both surfaces finely striate, both 

 margins strongly serrate. Pectoral pore simple, situated 

 above the last pectoral ray. 



Coracoid process striate, more or less exposed. 



Color brown, conspicuously marked with darker and 

 lighter; dorsal surface chocolate; a darker area at base 

 of dorsal fin, extending somewhat behind it as an irregu- 

 lar bar; a similar spot at base of adipose extending for- 

 ward below ; lateral line nearly white ; a dark spot behind 

 the humeral process, continuing backward through the 

 lower caudal lobe as a band which is somewhat inter- 

 rupted on the sides, the dark color of the back likewise 

 extending as a band through the upper caudal lobe; two 

 dark, somewhat obscure bands extending from occiput 

 to snout, a broader curved band connecting the anterior 



