Thyrins brasiliensis (Valenciennes). 
Head 4.1/6: depth 4 2/3; D. Ili<if,7; A. 1%, 
a 
13; V. i, 5; scales 39 in median lateral series from shoul- 
der to caudal base and 5 more on latter; 9 scales transvers- 
ely at soft dorsal origin; 20 predorssl scales to head; 
snout 3 in head; eye 34; maxillary 3; interorbital 3. 
Body well compressed, flattened sides of trunk constr- 
icted below; abdominal edge well convex; caudal peduncle well 
compressed, least depth 1 2/3 its length or 2¢ in head.Head 
width 1 4/5 its length. Snout broadly depressed, length 4/5 
its width. Eye high, with hind pupil edge about midway in 
head length. Mouth with short curved gape, upper jaw slight- 
ly longer. Maxillary largely concealed above, reaches beyond 
eye front though not quite to pupil. Narrow band of rather 
smell curved conic teeth in daws and each with outer row of 
few irregular larger similsr ones, best developed neer front 
above and on sides below. No vomerine or palatine teeth. 
Interorbital wide, very slightly convex. Gill-rakers 5 - 136, 
c* 
lanceolate, firm, long as filaments or 2 in eye. Scales firm- 
ly adherent, narrowly exposed, mostly uniform, with 1 ore 
basal points; about 50 basal circuli parallel with edge; 
apical portions and edges entire. Lateral line extends close 
over pectoral for 7 scales,then drops 1 scale and continues 
midway along side to caudal base medially; tubes smell and 
simple, only about one half of scale exposed. Spinous dor- 
sal inserted about midway between pectoral origin and caudal 
base, spines thin, fin scarcely 1/3 to soft dorsal. Origin 
of last nearer caudal base than depressed ventral tips. 
