450 CALIFORNIA ACADEMY OF SCIENCES. 



ANALYSIS <>!' TIM. cKNKKA OF CALLICHTHYID^. 



a. Body with two series of lateral lamime which overlap along the median 

 line forming a band-like depression; adipose fin spinous; ventral fins 

 inserted below or anterior to the dorsal fin; gill-membranes confluent 

 with the skin of the isthmus; teeth, if present, villiform. 

 b. Two pairs of nuchal plates between occiput and dorsal plate; suture 

 between humeral and coracoid processes extending almost horizontally 

 to the posterior margin of the pectoral armature; a large opening be- 

 tween coracoid and clavicle below and in front of the pectoral spine. 

 c. Coracoid covered with skin. 



d. Sides of the head with bristles. SCLEROMYSTAX xcv. 

 dd. Sides of the head without bristles; no mental barbels; lower 



jaw with small bands of teeth on the sides; a naked area along 



dorsal and ventral surfaces; suborbital bones concealed; dorsal 



spine rudimentary; caudal rounded. CALLICHTHYS xcvi. 



cc. Coracoid exposed below; coracoid bone joined to the clavicle its 



whole length. 



e. Two barbels at each rictifs, none at the symphysis. 



f. Lower lip without barbels; a naked area along ventral surface; 

 caudal rounded or emarginate; dorsal spine low and flat; pec- 

 toral spine serrate on inner margin in the young; outer margin 

 and surfaces covered with bristles. HOPLOSTERNUM xrvn. 



Jf. Lower lip with 4-6 barbels; ventral surface entirely covered; 



caudal emarginate; dorsal spine high and pointed, subterete; 



pectoral spine serrate on inner margin, finer teeth on outer 



margin. DECAPOGOX xcvm. 



ee. One barbel at each rictus; a pair of long barbels at the symphy. 



sis; coracoid processes entirely covering breast and belly. 



DlANEMA XCIX. 



66. Occipital with a narrow process extending to dorsal plate. 



rj. D. I, 10-11; coracoid process exposed below. BROCIIIS c. 



<jcj. D. I, 6-8; coracoid process exposed; suture between coracoid and 

 humeral processes extending from the large pectoral pore obliquely 

 downward and backward to the ventral margin of the pectoral 

 armature; dorsal and pectoral spines long, pungent, their outer sur- 

 faces smooth. CORYDOKAS ci. 



XCV. SCLEROMYSTAX. 



Sderomystax Giinther, Cat. Fish. Brit. Mus. v, 225, 

 1864 (barbatus). 



Sides covered with two series of plates meeting along 

 the middle of the sides. Two series of plates between 

 the occipital and the base of the dorsal spine. Head 



