SOUTH AMERICAN NEMATOGNATHI. 219 



Teeth of lower jaw, as in most species 

 of this group, in a narrow band; those 

 of the upper jaw in an arrow-shaped 

 patch, those of the vomer in an co- 

 shaped patch; the palatine patches long 

 and narrow, remote from the vomerine 

 patches; lower lip plicate. 



Gill-membranes separate to beyond 

 eye; gill-rakers overlapping, 5-f-14. 



Roughened plates on the lateral line 

 anteriorly. 



Dorsal spine behind middle from tip 

 of snout and end of adipose dorsal; long, slender, 

 with recurved teeth behind; 2| in head. Adipose fin 

 longer than base of anal. 



Caudal very deejily forked; the outer rays more than 

 half length of body; numerous basal rays. 



Ventrals extending for | of their length beyond the 

 vent; distance from vent to anal equals 4 diameters of 

 the eye; distance from vent to middle caudal rays equals 

 length of head. 



Pectoral spine 2^ in length of head; with retrorse 

 teeth behind. A pectoral pore. 



Uniform light brown, silvery below; several large 

 round black spots on sides; usually one on base of upper 

 lobe of caudal fin. 



Head 2f-2|; depth 7^ ; Br. 9 or 10; D. I, 6; A. 12. 



Subfamily DORADINiB. 



ANALYSIS OB" THE GENERA OF DORADINiE. 



a. Barbels all simjile. 



h. Eyeiu anterior portion of head; snout depressed; teeth well devel- 

 ojjed. 



c. Humeral process much shorter and weaker than the coracoid pro- 

 cess. No adipose dorsal; gill-openings greatly reduced. Clavicle 

 and coracoid forming a large shield below. Physopyxis xxxix . 



