60 CALIFORNIA ACADEMY OF SCIENCES. 



process, dorsal plate, top of head to between the eyes, 

 granular. Occipital process wider than long, scarcely 

 keeled. Fontanel not continued behind the eyes, and 

 without backward projecting groove. Posterior nostrils 

 connected by a membrane. 



Eye l|-22 in snout, 5|-8 in head, 2i--4 in interocular. 

 Barbels flattish; those of the maxillary reaching to 

 near the ventrals, to middle of pectorals in older; post- 

 mental to or beyond base of pectoral, mental to gill 

 opening. 



Teeth villiform; vomerine and pal- 

 atine patches of about equal size and 

 shape in the young; a separate patch 

 behind the palatines is developed 

 later. 



Gill-membranes meeting in an an- 

 gle, forming a foldacross the isthmus. 

 Gill-rakers 6+10. 



Distance of dorsal spine from snout 2|-2f in the 

 length; dorsal and pectoral spines subterete, the outer 

 margins roughened, the sides striate; the dorsal spine 

 slightly serrate behind; a little shorter than the pectoral 

 spine, 1^-1| in the head; pectoral spine strongly serrate 

 behind. Space between dorsal and adipose fins 3|-4 in 

 the length. Adipose fin as long as the dorsal. Upper 

 caudal lobe longer, about 4 in the length. 

 Anal as high as long, 2 in head. 

 Ventral l|-2 in head. 



Pectoral pore minute; sides with vertical series of 

 pores. 



Color plumbeous above, silvery on sides; fins dusky. 

 Head 3|-3f ; depth 5-6; D. I, 7; A. 18. 

 The specimens examined measure from .14-. 38 metres. 

 Para; Curuca; Bahia. 



