HYDROCTON. 



185 



ii times. Head Ih to 2h times as long as broad; snout H to 2 times 

 diameter of eye, which is 4 J to 5 J times in length of head and H to 2^ 

 times in interoibital width ; mouth extending to below anterior border 

 of eye, maxillary to below centre of eye ; 5 large teeth in upper jaw, 

 4 in lower ; suborbital and opercular bones rather strongly striated. 

 Gill-rakers very short, 10-12 on lower part of anterior arch. Dorsal 

 II 8-9, originating above ventral, at equal distance from end of snout 

 and from caudal, or a little nearer latter. Anal III 13-16, originating 

 at equal distance from base of ventral and from caudal. Pectoral as 



Fig. 142. 



Hydrocyon goliatJi, 

 Type (A. M. C). i 



long as ventral, | to f length of head. Caudal deeply forked, with 

 pointed lobes. Caudal peduncle once and f as long as deep. Scales 

 54-58 \^ ^ , 3 between lateral line and scaly process at base of ventral. 



"a 



Olive-brown above, silvery white on the sides and beneath ; more or 

 less distinct dark lines along the series of scales above lateral line ; 

 these lines absent in the young ; dorsal yellow or red ; adipose fin 

 black ; caudal edged with blackish, lower lobe red. 



Total length 1 metre or more. 



Congo. — Types in Congo Museum, Tervueren. 



1. One of the types. Manyanga. Capt. Wilverth (C). 



2. One of the types. New Antwerp. „ 



3. 4. Ad. & hgr. Monsembe. Rev. J. H. Weeks (P.). 

 5-6. Yg. Bolobo. Rev. G. Grenfell (C). 

 7. Ad. Upper Congo. Brussels University. 



