630 
Silvesterina parvibranchialis new species 
Depth 2 to 2 l/2 in head, 13 1/4 to 19 2/3 to caudal base; 
head 6 2/3 to 8 1/4, 2 3/5 to 2 4/5 to vent, width 2 1/5 to 3 
1/3 in length; combined head and trunk 1 2/3 to 1 9/10 in tail 
to caudal base. Snout 3 1/3 to 3 2/3 in head; eye 6 to 8 1/4, 
13/5 to 2 1/8 in snout, once to twice interorbital; mouth cleft 
reaches 2 2/5 in eye to opposite hind pupil edge, length 2 1/10 
to 2 2/3 in head; teeth in jaws in moderately broad bands, 
narrowing posteriorly, outer row r little longer and teeth often 
more w^ide spaced; 2 rather large teeth at front of vomer, de~ 
pressible, first or second variable larger, conspicuous; inter¬ 
orbital 5 2/5 to 10, slightly convex. 
Lateral line conspicuous, axial. 
Dorsal origin over pectoral origin or 2/5 of depressed 
pectoral, fin height 2 2/3 to 3 3/4 in head; anal fin height 3 
3/4 to 4 1/4; caudal 2 2/3 to 4 1/2, pointed; pectoral 2 1/3 to 
2 7/8, pointed. 
Uniform drab. Iris grayish. Inside mouth, pharynx and 
opening pale or dusky. Lips and under surface of head little 
paler than upper. Fins all pale, vertical fins posteriorly all 
darker or deeper drab basally. Pectoral uniformly pale. 
Diagnosis. Contained in the genus, with special reference 
to the very small infero-lateral pore like gill openings. 
Type N o. 
U. S. N. M. 
