496 ON FISHKS FROM LAKE TANGAXXIKA. [June 21, 



with 23 to 25 spines ; soft rays reduced to 3 to 5 ; anal with 3 

 spines. 



E. cyanoshctvs, sp. n. — Sq. 32-35 pj^^; ^- ^^*- "g^J depth oE 

 body 3 times in total length. 



TiiAPiA A. Smith. — A single species, remnrkable for its very 

 strongly developed lips, both produced into a large triangular lobe 

 in front : — 



T. lahiata, sp. n.— D. XVIII 10 ; A. Ill 6-7; Sq. 33-35 ^l^; 

 1. lat. Il^l? ; depth of body 2|-2| times in total length. 



Teophetjs, g. n. — Body moderately elongate ; scales ctenoid. 

 .Ta" s angularly bent at the sides, with bands of minute tricuspid 

 teeth, an outer row of bicuspid teeth, and enlarged conical teeth at 

 the sides of the premaxillary ; mouth transversely linear when 

 closed ; maxillary concealed under the praeorbital. Dorsal with 

 21 spines, anal with six. 



T. mooi-ii, sp. n.— D. XXI 5-6 ; A. VI 5-6 ; Sq. 30-32 ~ ; 

 1. lat. 1^2 ; depth of body 2| to 2| times in total length. 



SiMOCHROMis, g. n. for Chromis diagramma Gthr., differing 

 from Tilapia in the sides of the praeinaxillary being armed with 

 a single series of conical teeth. 



Petrochromis, g. n. — Body moderately elongate ; scales ctenoid. 

 Jaws with very broad bands of minute bristle-like teeth, with bi- 

 or tricuspid crowns ; maxillary concealed under the praeorbital. 

 Dorsal with 17 or 18 spines, anal with 3. 



P. polyodon, sp. n.— D. XVII-XVIII 8-9 ; A. Ill 7-8 ; Sq. 32- 

 34j|f3; 1. lat. f|f^ ; depth of body 2^ to 2f times in total length. 



Peeissodus, g. n. — Body elongate ; scales cycloid. Teeth rather 

 large, unequal in size, few, with s« ollen bases and low, compressed, 

 and slightly notched crowns perpendicular to the axis of the jaws, 

 disposed in a single series ; maxillary exposed. Dorsal with 18 

 spines, anal with 3. 



P. microlepis, sp. n.—D. XVIII 10; A. Ill 8; Sq. 65 1, ; 

 1. lat. g^^g-j ; depth of body 3| times in total length. 



Mastacembelid^. 



Mastacembelus moorii, sp. n.— D. X XV-XX VII 70-80 ; A. II 

 70-80. Vent equally distant from end of snout and base of 

 caudal fin ; length of head twice in its distance from the vent, 

 and nearly 5 in its distance from the first dorsal spine ; no prae- 

 opercular spine. 



SlLUEID^. 



Clarias liocfphalvs, sp. n. — D. 70 ; A. 50. Caudal free. Head 

 smooth, slightly longer than broad, 5 times in total length ; 



