SILURIDJi. 



Teeth on the palate reduced to two small patches, if present. 



24. Helicophagus, p. 64. 



*** Mandibulary barbels none ; nostrils open : the posterior are closer 

 together than the anterior, which are quite in front of the snout. 



Adipose fin present ; maxillary barbels minute. 



25. Silondia, p. 65. 



Third Subfamily. 



SILURID.E ANOMALOPTEILE. 



Dorsal and adipose fins very short, the former belonging to the 

 caudal vertebral column; anal very long. Ventrals in front of 

 the dorsal. Gill-membranes entirely separate, overlapping the 

 isthmus. 



Group E. Hypophthalmina. 



The ventral fins are in front of the dorsal. 



a. The eye is small, situated above the level of the angle of the mouth. 

 Teeth in the jaws, 26. Helogenes, p. 66. 



b. The eye is situated behind, and partly even below the level of, the angle of the 



mouth. 



Teeth none 27. Hypophthalmus, p. 67. 



Fourth Subfamily. 



SILURLD^J PROTEROPTEILE. 



Dorsal fin short, placed anteriorly on the trunk, in advance of 

 the ventrals ; adipose fin well developed, sometimes short ; anal 

 short, or of moderate length. Gill-membranes not confluent with 

 the skin of the isthmus, with free posterior margin. 



Group F. Bagrina. 



The anterior and posterior nostrils are remote from each other, and 

 the posterior is provided with a barbel. 



a. Teeth on the palate present : Old World. 



* Four mandibulary barbels. 



Dorsal with 9-10 soft rays, anal with less than 20 ■ teeth on the jmlate con- 

 tinuous 28. Bagrus, p. 69. 



Dorsal with 6 soft rays, anal with less than 20 ; the teeth on the palate form two 

 groups 29. Chrysichthys, p. 70. 



Dorsal with 6 soft rays, anal with less than 20 ; the teeth on the palate form four 

 groups 30. Clarotes, p. 73. 



Dorsal with 7 soft rays, anal with less than 20 ■ teeth on the palate continuous ; 

 no moveable labial teeth ; orbital margin free. 



31. Mackones. p. 74. 



