HETEEOBEANCHUS. 303 



are represented in the figure in the great work on Egypt; whether this peculiarity is 

 to be ascribed to a defective condition of the specimen coupled with inaccuracy on the 

 part of the artist, or is due to individual variation or to specific difference, in which 

 case the specimens here described should bear the name H. senegalensis, must remain 

 an open question. But there can be no doubt that the specimens named //. intermedins 

 cannot be specifically separated from their West-African representatives. 



This and the next species are known by the name of Karmout or Armout and 

 by the following names noted by Mr. Loat : — " Hal a, " 0^) in Upper Egypt ; 

 "kurr" (J*) in Nubia; " surrHer" (y>) at Omdurman. 



2. HETEROBRANCHUS LONGIF1L1S. 

 (Plate LIV. fig. 2.) 



Cuvier & Valenciennes, Hist. Poiss. xv. p. 394, pi. ccccxlvii. (1840) ; Griinther, Cat. Fish. v. p. 22 



(1864), and Petherick's Trav. ii. p. 221 (1869). 

 Heterobranclms laticeps, Peters, Mon. Berl. Ac. 1852, p. 682, and Reise n. Mossamb. iv. p. 37, pi. vii. 



fig. 1 (1868) ; Boulenger, Poiss. Bass. Congo, p. 265 (1901). 



Depth of body six to eight times in the total length, length of head three to 

 three and two-thirds times. Head less strongly depressed than in the preceding 

 species, once and a half to once and two-thirds as long as broad, its upper surface 

 coarsely granulate in the adult ; occipital process acutely pointed ; frontal fontanelle 

 knife-shaped, twice and a half to four times as long as broad, three and a half to six 

 and a half times in the length of the head ; occipital fontanelle small, in advance of 

 the occipital process ; eye twice and a half (very young) to four and a half times in the 

 length of the snout, four to nine times in the interorbital width ; width of mouth a 

 little less than the interorbital width ; band of prsemaxillary teeth five to six times as 

 long as broad ; vomerine teeth also villiform, forming a crescentic band which is nearly 

 as broad as or a little broader than the prsemaxillary band. Nasal barbel half to 

 once the length of the head ; maxillary barbel once and one-fifth to twice the length 

 of the head, extending to the end of the pectoral fin or between this point and the 

 origin of the anal fin ; outer mandibular barbel once and a half to once and three- 

 fourths as long as inner, which measures half to nearly once the length of the 

 head. Gill-rakers rather short, 20 to 30 on anterior arch. Dorsal fin with 29 to 34 

 rays, its distance from the occipital process one-seventh to one-third the length of the 

 head ; adipose dorsal as long as or a little shorter and lower than the rayed dorsal, 

 commencing immediately behind or at a short distance from the latter. Anal fin with 

 44 to 54 rays, extending, like the adipose dorsal, to the base of the caudal fin. 

 Pectoral fin two-fifths to one-half the length of the head, the spine feebly serrated on 



