1899.] SYRIAN PISHES OF THE FAMILY CICHLlDJB. 135 



the caudal peduncle, the last on the root of the caudal fin ; two 

 round white spots on the anal fin. 



Total length 73 miUim. 



A single specimen, collected by Dr. Livingstone on the Zamhesi 

 Expedition. 



53. TiLAPiA DESFONTAiNEsi. (Plate XI. fig. 3.) 



Labrus desfontainii, Lacep. Hist. Poiss. iv. pp. 54 & 160 (1802). 



Sparus (?) desfontainii, Gervais, Zool. Pal. Gen. p. 208, pi. xlv. 

 fig. 4 (1869). 



Chromis desfontainii, Sauvage, Bull. Soc. Philom. (7) i. 1877, 

 p. 160 ; Vincig. Ann. Mus. Genova, xx. 1884, p. 429 ; Eolland, 

 Eev. Scientif. (4) ii. 1894, p. 418, fig. 



Teeth in 3 sei-ies in both jaws, outer moderately large, uni- or 

 bicuspid, inner very minute. Depth of body 2\ to 2| in total 

 length, length of head 2-| to 24. Snout with straight upper profile, 

 Ij to 1| diameter of eye, which is 4 to 4^ times in length of head 

 and equal to or sHghtly less than the interorbital width ; mouth 

 moderate, f to f width of head ; maxillary extending to below 

 anterior border of eye ; 4 series of scales on the cheek ; large 

 scales on the opercle. Gill-rakers short, tubercle-like, 7 or 8 

 on lower part of anterior arch. Dorsal XV-XVI 10-11 ; 

 last spine longest, f to i length of head, f to | longest soft rays. 

 Pectoral obtusely pointed, f to | length of head, not extending to 

 origin of anal. Ventral reaching vent or origin of anal. Anal 

 III-IV8-10; third spine shorter and stronger than last dorsal. 

 Caudal rounded. Caudal peduncle as long as deep. Scales ctenoid, 

 30-33 j^g ; lat. 1. ^^ . Brownish or olive ; a more or less distinct 

 dark streak from below the eye to the angle of the mouth ; a dark 

 opercular spot ; vertical fins with small dark and light spots ; 

 ventrals black. 



Total length 90 millim. 



Algerian and Tunisian Sahara. 



This species links Tilapia with Paratila^na. In some specimens, 

 as observed by Sauvage, nearly all the outer teeth are conical and 

 unicuspid, whilst in others all or most of the outer teeth are 

 provided with a lateral cusp situated on the outer side at a consider- 

 able distance from the apex. 



54. Tilapia flayii-josbphi. 



Chromis Jlavii-josephi, Lortet, Arch. Mus. Lyon, iii. 1883, p. 141, 

 pi. viii. fig. 2. 



Teeth as in T. desfontamesi. Depth of body equal to length of 

 head, 2^ in total length. Snout with straight upper profile, 1^ 

 to I5 diameter of eye, which is 4 to 4^ times in length of head and 

 equals interorbital width ; mouth large, f to | width of head ; 

 maxillary extending to below anterior border of eye ; 3 or 4 series 

 of scales on the cheek ; large scales on the opercle. Gill-rakers 

 short, 8 on lower part of anterior arch. Dorsal XIV-XV 8-9 ; 



