SILUBID.-E. 



spine. Ventral with six rays. Air- 

 bladder partially protected by bone 14. AILIA. 



Similar to Atlia but destitute of ventral tins. . 15. AiLiic 



Teeth present on the palate. Barbels 

 eight. Dorsal and pectoral spines. An 

 adipose dorsal. Ventral with six or eight 

 rays; anal with from about twenty- 

 seven to fifty-five rays. Air-bladder free. 16. PSKUDEUTROPIUS. 



Teeth present on the palate. Barbels four. 

 Dorsal and pectoral spines ; an adipose 

 dorsal. Ventral with six, anal with trora 

 about twenty-nine to thirty-nine rays. 

 Air-bladder free ". 17. PANOASIUS. 



Teeth on the palate. Barbels two or four. 



A short dorsal having a spine, also an- 



adipose fin ; an elongated anal (forty or 

 fifty rays). A pectoral spine. Ven- 

 tral with six rays. Air-bladder partially 

 protected by bone . . . 18. SLLUNDIA. 



b. Length of the anal fin much less than the caudal portion of the 

 vertebral column. 



Gill-openings very wide, the membranes not 

 confluent with the skin of the isthmus, 

 but overlapping one another, being cleft 

 nearly to the chin. Teeth present on the 

 palate. Barbels eight. Dorsal and pec- 

 toral spines ; an adipose fin. Ventral 

 with six, anal with from about eight or 

 nine to twenty or more rays. Air- 

 bladder free 19. MACHONES. 



Gill-openings very wide, the membranes not 

 confluent with the ekin of the isthmus, 

 but overlapping one another, being cleft 

 nearly to the chin. Teeth present on the 

 palate. Barbels six or eight. Dorsal and 

 pectoral spines ; an adipose fin. Ventral 

 with six, anal with from about fifteen to 

 twenty rays. Air-bladder free 20. LIOCASSIS. 



Gill-openings wide, the membranes not con- 

 fluent with the skin of the isthmus, and 

 scarcely or not notched. Teeth present 

 on the palate. Barbels six or eight. 

 Strong dorsal and pectoral spines, an 

 adipose tin. Ventral with seven or eight 

 rays, anal with twelve to thirteen. Air- 

 bladder free 21. RITA. 



Gill-openings wide, the membranes not con- 

 fluent with the skin of the isthmus, and 

 scarcely or not notched. Teeth present 

 or absent on the palate. Barbels six. 

 Dorsal and pectoral spines ; an adipose 

 fin. Ventral with six, anal with from ^ 

 about fourteen to at least twenty-four 

 fayir~5Ir-bladder free 22. ABICS. 



Gill-openings wide, the membranes not con- 



