16 siluridjE. 



5. CI arias lazera. 



Cuv. 8f Val. xv. p. 372 ; Hyrtl, Denkschr. Acad. Wiss. Wien, 1859, xvi. 

 p. 17. 



D. 77. A. 58. P. 1/10. Vert. 20/41 (C. $ V.) : 17/45 {Hyrtl). 



Vomerine teeth granular, forming a band, which in its middle is 

 broader than that of the intermaxillaries ; it has not a process behind 

 in the middle of its concavity. Head coarsely granulated above, its 

 length being one-fourth of the total. Barbels long: those of the 

 nostril extend nearly to the root of the pectoral, those of the maxil- 

 lary beyond the origin of the dorsal. The pectoral fin extends to, or 

 somewhat beyond, the vertical from the origin of the dorsal ; its spine 

 is short, not quite two-thirds as long as the fin. The dorsal extends 

 to the root of the caudal. 



Nile. 



a, b, c-e. Adult, half-grown, and young. Upper Nile. From Consul 



Petherick's Collection. 

 f-h. Young. Gondokoro. From Consul Petherick's Collection. 

 i. Dried. Nile. Presented by G. MacLeay, Esq. 



6. Clarias macracanthus. 

 D. 70-75. A. 54-55. P. 1/9. Vert. 19/43. 



Vomerine teeth granular, forming a band, which in its middle ia 

 twice as broad as that of the intermaxillaries, and in the middle of 

 its posterior margin has a very short inconspicuous process. Head 

 coarsely granulated above, its length being a little more than one- 

 fourth of the total. Barbels of moderate length, those of the nostril 

 being two-fifths as long as, and those of the maxillary extending to 

 the end of, the head. The pectoral fin reaches to tne vertical from 

 the origin of the dorsal ; the length of its spine is three-quarters, or 

 rather more than two-thirds, of that of the fin. 



Nile. 



a, b-c. Sixteen inches long. Upper Nile. From Consul Petherick's 

 Collection. 



d. Adult. From the Collection of the Zoological Society. 



e. Adult: skeleton. From Dr. E. Ruppell s Collection as CI. hassel- 



quistii. 



7. Clarias xenodon. 



D. 68. A. 54. P. 1/9: 



Vomerine teeth granular, forming a crescentic band, which in its 

 middle is twice as broad as that of the intermaxillaries, and in 

 the middle of its posterior margin has a very short and inconspi- 

 cuous process. The band of mandibulary teeth is as broad as that 

 on the vomer, and composed of villiform teeth anteriorly, and of gra- 

 nular posteriorly. Head coarsely granulated above, its length being 

 rather more than one-fourth of the total. Barbels of moderate length, 

 those of the nostrils being half as long as the head, and those of the 

 maxillary extending to the end of the pectoral spine. The pectoral 



