104 TELEOSTEI. PHISO8TOMI. 



fluent with the skin of the isthmus, and 

 not notched. No teeth on the palate. 

 Barbels six. Dorsal and pectoral spines ; 

 an adipose fin. Ventral with six, anal 

 with about twenty rays. Air-bladder 

 free 23. KETENGUS. 



Gill-openings very wide, the membranes not 

 confluent with the skin of the isthmus, 

 but overlapping one another, being 

 notched. Teeth on the palate. Barbels, 

 one semi-osseous maxillary pair. Dorsal 

 and pectoral spines ; an adipose fin. Ven- 

 tral with six, anal with from about 

 nineteen to twenty-four rays. Air- 

 bladder free 24. OSTEOGENIOSUS. 



Gill-openings wide, the membranes not con- 

 fluent with the skin of the isthmus, and 

 not notched. Teeth present on the palate. 

 Barbels two. Dorsal and pectoral spines ; 

 an adipose fin. Ventral with six, anal 

 with about twenty rays. Air-bladder 

 free 25. BATHACIIOCEPIIAI.US. 



Gill-openings of moderate width, not con- 

 fluent with the skin of the isthmus. No 

 palatine teeth. Barbels eight. Dorsal 

 and pectoral spines ; an adipose fin. Ven- 

 tral with six, anal with few (8-10) rays . 26. AKYSIS. 



Gill-openings wide, the membranes confluent 

 with the skin of the isthmus. No teeth 

 on the palate. Barbels eight. Dorsal 

 fin with one spine and six rays. A pec- 

 toral spine ; an adipose fin ; anal rather 

 short. Ventral with six rays. Air- 

 bladder enclosed in bone 27. BAGAIUUS. 



Gill-openings wide, the membranes confluent 

 with the skin of the isthmus. No teeth 

 on the palate. Barbels eight. Dorsal 

 fin with one spine and six or seven rays ; 

 an adipose fin. A pectoral spine. Anal 

 short. Ventral with six rays. An ad- 

 hesive apparatus formed of longitudinal 

 plaits of skin, situated on the chest 

 between the bases of the pectoral fins. 

 Air-bladder enclosed in bone 28. GLYPTOSTKRNUM. 



As in last genus but having palatine teeth . . 29. EUGLYPTOSTERNUM. 



Gill-openings narrow, the membranes being 

 confluent with the skin of the isthmus. 

 Mouth narrow. Occipital, scapular, and 

 humeral processes well developed. No 

 palatine teeth. Barbels eight. Dorsal 

 and pectoral spines present; an adipose 

 fin. Ventral with six, anal with about 

 ten rays Air-bladder free 30. ERETHISTES. 



Gill-openings rather narrow, the membranes 

 being confluent with the skin of the 

 isthmus. No teeth on the palate. 



