122 ME. G. A. BOULENGER ON THE AFRICAN AND [Feb. 7, 



middle soft rays, which are much produced. Pectoral pointed, as 

 lona; as head, not extending to origin of anal. Ventral reaching 

 vent or origin of anal. Anal III 10-11 ; third spine shorter than 

 last dorsal ; soft rays produced like the dorsals. Caudal rounded. 

 Caudal peduncle deeper than long. Scales cycloid, 32,'^^^ ; lat. 1. 



20—9 ly-vi» 11 — lo 



^^^-^. Olive-brown ; a black opercular spot ; soft dorsal and caudal 



with numerous small round blackish spots. 

 Total length 340 millim. 

 Loango. 



25. TiLAPiA MARi^, sp. n. (Plate XI. fig. 1.) 



Teeth small, in 3 series in both jaws. Depth of body 2 to 2-?- 

 in total length, length of head 2| to 3 times. Snout with straight 

 upper profile, as long as diameter of eye, which is 3 times in 

 length of head and 1| to Ij in interorbital width ; mouth rather 

 small, f width of head ; maxillary extending to between nostril 

 and eye ; 4 series of scales on the cheek ; large scales on the 

 opercle. Gill-rakers short, 13 on lower part of anterior arch. 

 Dorsal XVI 12 ; spines equal in length from the 5th, i length of 

 head. Pectoral pointed, as long as head, not extending to origin 

 of anal. Ventral produced into a filament, reaching origin of 

 anal. Anal III 10 ; third spine nearly as long as longest dorsals. 

 Caudal truncate. Caudal peduncle a little deeper than long. 

 Scales cycloid, 30-31 j| ; lat. 1. j^^. Pale brown, with 7 or 8 



dark bars, five of which extend on the dorsal. 



Total length 80 millim. 



Azumine Creek, Opobo Eiver, Niger Delta. Two specimens, 

 collected by Miss Mary Kingsley. 



26. TiLAPIA HOEII. 



CJiromis horii, Griinth. Proc. Zool. Soc. 1893, p. 630, pi. Iviii. 

 fig. A. 



Tilapia horii, Bouleug. Tr. Zool. Soc. xv. 1898, p. 5. 



Teeth very small, in 4 or 5 series in both jaws. Depth of body 

 3 to 3j times in total length, length of head 2| to 24. Snout 

 with straight upper profile, 1| to 1| diameter of eye, which is 

 contained 4 times in length of head and a little exceeds interorbital 

 width ; mouth moderate, | width of head, extending to between 

 nostril and eye ; 3 series of scales on the cheek. Gill-rakers short, 

 13 on lower part of anterior arch. Dorsal XVI 8-9 ; spines equal 

 from the 5th or 6th, g to f length of head, f to | longest soft 

 rays. Pectoral pointed, | length of head, not extending to origin 

 of anal. Ventral reaching vent or origin of anal. Anal III 6-7 ; 

 third spine slightly shorter than longest dorsals. Ciiudal rounded, 

 subtruucate. Caudal peduncle a little longer than deep. Scales 

 cycloid, 30-31 —^ ; lat. 1. ^^f-^. Pale olive above, with 7 or 8 

 very indistinct darker bars ; large irregular brown spots may be 



