OF FISHES FEOM LAKE TANGANYIKA. 573 



Dr. Cunnington measured a specimen 610 millim. long, and notes that the fish is 

 said to grow still larger. 



74. TlLAPIA GRAXDOCULIS Bl£T. 



Three specimens from Niamkolo, native name Wesiva, and one from Surabu, native 

 name Kisangi. 



Dorsal XIII-XIV 13-14 ; Anal III 9 ; Scales 58-65 ^ ; Lateral lines |=g ; 14 to 



16 gill-rakers on lower part of anterior arch. The ventrals do not extend beyond the 

 origin of the anal. 



Dr. Cunnington describes the coloration as dark olive-brown above, shading to 

 lighter, with some yellow, below ; a series of about five irregular blackish blotches 

 on the side of the body ; dorsal with yellow spots, tipped black ; pectoral slightly, 

 ventral strongly tinged with yellow; anal with yellow markings; proximal half of 

 caudal darker than the rest. 



75. Petrochrojiis poltodox iBlgr. 



Two specimens from Niamkolo and one from Pembe. Native names : Infutu and 

 Ilianbu. 



In the largest specimen, 170 millim. long, the depth of the body equals the length of 

 the head, the diameter of the eye is contained nearly 5 times in the length of the head 

 and once and \ in the interorbital width. There are 6 series of scales on the cheek, 

 and 19 spines in the dorsal tin. Its colour when fresh is noted as "Greenish brown 

 over most of the body, but a little lighter below, with a patch of rather darker colour 

 at the edge of each scale." A smaller specimen is described as " Olive above, shading 

 off to lighter and greyish below, scales outlined by rather darker shade ; dorsal fin 

 •with reddish tinge in anterior region and tipped black ; anal with several prominent 

 spots of bright yellow ; distal half of ventrals slightly reddish." 



76. Petrochromis tangankle Gthr. 



One specimen from Niamkolo and one from Kituta. Native name : Kilongo. 



CuNNINGTONIA, g. 11. 



Jaws with broad bands of minute, bristle-like teeth with incurved tricuspid crowns. 

 Maxillary largely exposed at the end. Body moderately elongate, covered with small, 

 feebly ctenoid scales; two lateral lines, the upper complete. Dorsal with 13 spines, 

 anal with o. Vertebra; 36 (18 + 18). 



Agrees with I'etrochromis in the dentition, differs in the maxillary bone being largely 

 exposed when the mouth is closed. 



