70 On neio Cichl id Fishes from Lake JSyassa. 



Cyrtocara Moorii. 

 D. XVI 11. A. IV 8. Sq. 37n- L. lat. 25/16. 



Depth of body 2^ times in total lengtli, length of head 3^. 

 Forehead with a strono; dermal gibbo.sity ; snout short:, its 

 ])rofile descending very steeply ; diameter of eye 3^ times in 

 length of head; maxillary extending to below anterior border 

 of eye ; lower jaw projecting ; four series of scales on the 

 cheek; 10 gill-rakers on lower part of anterior arch. Dorsal 

 spines rather feeble, increasing in length to the last, which 

 measures \ length of head ; longest dorsal rays as long as 

 head. Pectoral a little longer than hea 1. Ventral as long 

 as head. Caudal densely scaled, dei-ply notched. Scales 

 with very indistinctly denticulate border. Brown above, 

 whitish beneath ; fins darker. 



Total length 185 millim. 



A single specimen. 



Petrochroniis Nyassce. 

 D. XIX 8. A. Ill 7. Sq. 35 i|. L. lat. 23/U. 



Depth of body 2^ times in total length, length of head 3. 

 Diameter of eye 4 times in length of liead ; mouth exteii ling 

 to between nostril and eye ; teeth extremely rmiuerous, 

 forming very broad bands in both jaws ; 4 series of scales on 

 the chetk; 13 gill-rakers on lower ])art of anterior arch. 

 Dorsal spines equal from the seventh, nearly half as long as 

 head, l^ectoral a little longer than head, nearly reaching 

 origin of anal ; ventral much produced, extending beyond 

 origin of anal. Caudal slightly emarginate. Uniform olive- 

 brown ; a blackish opercular spot ; dorsal and anal fins edged 

 with blackish. 



Total length 185 millim. 



A single specimen. 



Closely allied to P. yolyodon^ I^lgi'-) ^i'"^'" Lake Tanganyika, 

 but one spine more in the dorsal, pectoral and ventral more 

 elongate, and scales more numerous in a vertical series. 



Hemitilapia, gen. nov. 



Like Tilapia^ Smith, but jaws with moderately broad 

 bands of slender club-shaped movable teeth, with slightly 

 incurved crowns, those of the outer series larger, with the 

 crown obliqucdy truncate and pointing forwards. 



