1899.] SYRiAif risHEs or the family cichlid.?:. 121 



Teeth very small, ia 3 or 4 rows in both jaws. Depth of body 

 2| to 2| in total length, length of head 2^ to 3 times. Snout with 

 straight or humped upper profile, li to 2 as long as the diameter 

 of the eye, which is 4i to 6 times in length of head and li to If 

 in interorbital width ; mouth moderate, f to f width of head ; max- 

 illary extending to between nostril and eye ; 3 or 4 series of scales 

 on the cheek. Grill-rakers short, 10 on lower part of anterior 

 arch. Dorsal XIV-XV 9-10 ; last spine longest, i to f length oO 

 head, f to ^ longest soft rays. Pectoral pointed, a little shorter 

 than the head, not extending to origin of anal. Ventral not reach- 

 ing vent. Anal III 7-8 ; third spine as long as or a little shorter 

 than last dorsal. Caudal rounded. Caudal peduncle as long as 

 deep or slightly longer than deep. Scales cycloid, 30-32 ^^ ; lat. 1, 

 ii=l2- Brownish green above, bluish silvery below ; 8 oblique dai-k 

 bars on the body, sometimes very indistinct ; fins uniform bluish 

 white ; a dark bar below the eye ; a black opercular spot. 



Total length 160 millim. 

 "' Syria. 



23. TiLAPIA THOLLONI. 



Chromis thoUoni, Sauvage, Bull. Soc. Zool. France, 1884, p. 196, 

 pi. v. fig. 1. 



Teeth very small. Depth of body 2f in total length, length of 

 head 3 times. Snout with slightly concave upper profile, 1-1- dia- 

 meter of eye, which is 4 times in length of head; interorbital space 

 a little wider than diameter of eye ; maxillary not quite reaching 

 to below anterior border of eye ; 4 series of scales on the cheek. 

 Dorsal XVI 8 ; last spiue longest, about | length of longest soft 

 rays. Pectoral obtuse, nearly as long as the head, not extending to 

 origin of anal. Ventral extending beyond origin of anal. Anal 

 III 9. Caudal rounded. Caudal peduncle nearly as long as deep. 

 Scales cycloid, 32 y^. Olive ; a black opercular spot and a blackish 

 lateral stripe ; soft dorsal and caudal with purplish spots. 



Total length 180 millim. 



Upper Ogowe. 



24. TiLAPIA CABB^. 



Tilapia cabne, Bouleng. Ann. Mus. Congo, Zool. i. 1899, p. 51, 

 pi. xxvii. 



Teeth in outer row moderate, separated by an interspace from 

 a band of 4 transverse series of smaller closely-set teeth. Depth 

 of body 2 to 21 in total length, length of head 3 times. Snout 

 with straight upper profile, 1| to If diameter of eye, which is 

 4 to 4-1- times in length of head and 1^ to 2 in interorbital width ; 

 mouth -I width of head, extending to between nostril and eye ; 4 

 series of scales on the cheek ; large scales on the opercle. Grill- 

 rakers short, 10 to 12 on lower part of anterior arch. Dorsal 

 XVI 12-13 ; last spiue longest, | to 1 length of head, | to f 



