OF riSHES 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 GEANDOCULIS Blgr. 



Three specimens from Niamkolo, native name Weswa, and one from Sumbu, native 

 name Kisangi. 



Dorsal XIII-XIV 13-14 ; Anal III 9 ; Scales 58-65 ,^; Lateral lines ^|=i?; 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-brovv'n 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. Pbtrochromis poltodon Blgr. 



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

 Ilumhi. 



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 f in the interorbital width. There are 6 series of scales on the cheek, 

 and 19 spines in the dorsal fin. 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. Petkochromis tangasic^ Gthr. 



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



CUNNINGTONIA, g. n. 



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 3. Vertebrge 36 (18 + 18). 



Agrees with Fetrochromis in the dentition, differs in the maxillary bone being largely 

 exposed when the mouth is closed. 



