234 



CHAEACINIDiE. 



part of anterior arch. Dorsal II 8, originating just behind vertical of 

 root of ventral, at equal distance from anterior border of eye and from 

 caudal, longest ray a little shorter than head. Anal III 19. Pectoral 

 as long as head, reaching ventral. Caudal forked. Caudal peduncle 

 as long as deep. Scales 33 A 2 between lateral line and root of ventral. 



2 



Silvery, back greyish green ; a large black spot on caudal peduncle, 

 extending on median rays of latter; anterior border of dorsal and 

 posterior part of caudal blackish. 



Total length 145 millim. 



Kingani River, German East Africa. — Described from the type in 

 the Berlin Museum. 



4. PETERSIUS TANGENSIS. 

 Lonnb. in Sjostedt, Kilimandj.-Meru Exped., Fish. p. 2 (1907). 



Depth of body 3| to 4 times in total length, length of head 4 to 4| 

 times. Head twice as long as broad, considerably longer than deep ; 

 lower jaw projecting slightly beyond snout ; snout shorter than eye, 

 which is 2£ to 2f times in length of head; interorbital width 2§ times 

 in length of head ; maxillary extending to below anterior border of eye ; 

 outer prsemaxillary teeth 4, alternating with these of inner row, 8 in 

 number; 8 teeth in lower jaw. Gill-rakers short, 16-17 on lower part 

 of anterior arch. Dorsal II 8, originating behind vertical of base of 



Pig. 177. 



Petersius tangensis. 

 Type. 



ventral, at equal distance from anterior border of eye and from caudal. 

 Adipose fin very small. Anal III 16-17. Pectoral a little shorter than 

 head, not quite reaching ventral. Caudal deeply forked. Caudal 

 peduncle about 1£ times as long as deep. Scales 35-36 p, 'l\ or 3 

 between lateral line and root of ventral. Silvery, back olivaceous ; a 

 darker silvery lateral band. 

 Total length 57 millim. 



