280 silueim:. 



B. Maxillary barbel longer than head, nasal barbel at least nearly as long as head ; distance 

 between dorsal fin and occipital process three to four times in length o£ head. 

 Dorsal 65-78, Anal 55-62 ; gill-rakers 14-15 on anterior arch ; occipital 



process longer than broad 1. C. alluaudi, Blgr. 



Dorsal 82-91, Anal 68-72 ; gill-rakers 16-18 on anterior arch ; occipital 



process not longer than broad 8. C. werneri, 



1. CLARIAS ANGUILLARIS. 

 (Plate XL1X.) 



Silurus anguillaris, Linnaeus, in Hasselquist, Reise Palgest. p. 415 (1762), and Syst. Nat. i. p. 502 



(1766). 

 Macropteronotus charmuth, part., Lacepede, Hist. Poiss. v. p. 85 (1803). 

 Macropteronotus anguillaris, part., Riippell, Beschr. n. Fische Nil, p. 5 (1829). 

 Clarias hasselquistii, Cuvier & Valenciennes, Hist. Poiss. xv. p. 362, pi. ccccxlvi. (1840). 

 Clarias anguillaris, Giinther, Cat. Fish. v. p. 14 (1864) ; Peters, Reise n. Mossamb. iv. p. 36 



(1868) ; Giinfcher, Petherick's Trav. ii. p. 217 (1869) ; Panceri, Rend. Ace. Sc, Soc. R. Nap. 



xii. 1873, p. 110. 

 Clarias par vimanus, Giintber, opp. citt. pp. 15, 218. 



Depth of body five and one-third to seven and three-fourths times in the total length, 

 length of head three to three and three-fourths times. Head once and a half to once 

 and two-thirds as long as broad, its upper surface coarsely granulate in the adult; 

 occipital process angular; frontal fontanelle elliptical, sole-shaped, or knife-shaped, 

 three to five times as long as broad, three and a half to five times in the length of the 

 head ; occipital fontanelle small, in advance of the occipital process ; eye twice (very 

 young) to four and a half times in the length of the snout, three to nine times in the 

 interorbital width; width of mouth nearly equal to the interorbital width; band 

 of prsemaxillary teeth five and a half to eight times as long as broad ; vomerine teeth 

 mostly conical, sometimes subgranular behind, forming a crescentic, continuous or 

 narrowly interrupted band which is as broad as or narrower than the prsemaxillary 

 band. Nasal barbel one-fourth to two-fifths the length of the head (one-balf to 

 two-thirds in the very young) ; maxillary barbel three-fifths to five-sixths the length 

 of the head (three-fourths to once and one-fifth in the very young), reaching the 

 gill-opening or the extremity of the pectoral spine ; outer mandibular barbel once and 

 one-fourth to once and a half as long as inner, which measures one-third to two-fifths 

 the length of the bead (two-thirds to nearly once in the very young). Gill-rakers 

 rather short, 20 to 27 on anterior arch. Clavicles hidden under the skin. Dorsal fin 

 with 65 to 76 rays, its distance from the occipital process one-seventh to one-fourth 

 the length of the head, its distance from the caudal fin once to twice and a half the 

 length of the eye. Anal fin with 53 to 62 rays, narrowly separated from the caudal. 



