692 
Avocettlnopslnaa. Beak soft, flexible, less 
than 1/4 head} no teeth gill openings clear¬ 
ly separated at throat} lateral line with 
row of large pores} pectoral well developed 
and rays in 2 rows} dorsal begins on head, 
weal before anal, Avocettinops, 
Serrivomerinae, Beak stiff and firm, somewhat 
less than head} teeth present} gill opening 
partially confluent at throat} lateral line 
without pores} pectoral rudimentary, rays in 
single row} dorsal begins behind pectoral, 
h^. All teeth minute, unifonn, fine} anal begins 
somewhat opposite dorsal, 
2 
h , Teeth strong, variable} vomerine teeth usual 
-ly larger than maxillary} anal begins be¬ 
fore dorsal, 
1 
i , Vomerine teeth flattened, lanceolate, in 2 
parallel rows which form crest or saw 
like plate on mouth roof, Serrivomer, 
i , Vomerine teeth pointed, conic, well sep¬ 
arated, form single row on mouth roof. 
Tail lanooolsite} nostril in tube each 
Platuronides, 
2 
J , Tail slender} nostril without tube, 
Spinivomer, 
