HYDEOCYON. 109 



numbers were collected at Luxor, and nowhere else, by Mr. Loat ; but all the specimens 

 were young, the largest measuring only 180 millimetres. The two species are not 

 distinguished under special names by the native fishermen. 

 List of specimens examined : — 



2 Lower Nile.— Petherick, 1861. 



280 At regulators near Luxor.— Loat, 8.10-12.11.00. 



3 Khartum.— Petherick, 18G2. (Types.) 

 1 Lake Chad.— Capt. Gosling, 1904. 



1 Shari-wasu River at Maidugari. — Capt. Gosling, 1904. 



1 Matam, Senegal.— Delhez, 1900. 



5 McCarthy Id., Gambia.— Budgett, 1898. 



This species is easily distinguished from H. forskalii by the shorter body covered 

 with proportionally smaller scales, the smaller eye, and the more posterior position of 

 the dorsal fin. H. goliath, Blgr., from the Congo, which reaches a length of six feet, 

 is very closely allied to H. brevis, differing chiefly in the usually greater number of 

 branched anal rays (13-15) and of scales (54-58 9 -t^) and in the larger eye. 



