SILVER MXJLLET 



409 



20 mm. standard length. In stained material cf 

 this size the teeth of the upper lip are in a single 

 series, have simple tips, and number about 12 to 15 

 on each half of the lip (about half protrude from 

 the fleshy lip). There are no teeth in the lower 

 jaw. At about 30 mm. the teeth in the single row 

 in the upper lip are larger, number about 30 to 35 

 in each half of the lip, all protrude from the lip, 

 and have simple tips that curve inward. The lower 



lip has a single row of simple-tipped teeth which 

 are smaller than those of the upper lip. These 

 point straight outward from the thin lip edge, 

 number about 30 on each half of the lip, but barely 

 protrude beyond the lip edge. 



In specimens about 50 mm. long the simple- 

 tipped teeth in the single row in the upper lip 

 number about 30 on each half of the lip, but now 

 appear to have flattened tips which are bent 



200 



2 4 6 8 10 20 40 60 80 100 



STANDARD LENGTH IN MM. 

 Figure 21. — Relation of distance from snout to insertion of anal fin to standard length.' 



400 600 



' See footnote 1, p. 405. 



