> THE TANGANYIKA PROBLEM. 



Anal III. 7-8 ; third spine longest, as long as longest dorsal. Caudal truncate. 



3 — 4 22 — 24 



Caudal peduncle as long as deep. Scales 32-34 - ; lat. 1 . Olive- 



brown, whitish beneath ; fins grey or blackish. 



Total length, 135 millim. 



Described from two specimens from Kinyamkolo, and two from Mbity Rocks. 



The pnsmaxillary and mandibular bones are very massive, and the maxillary is 

 much reduced in size ; the ascending processes of the praemaxillaries extend to 

 between the anterior borders of the orbits and are received in a deep excavation, to 

 which the strong occipital crest extends ; the parietal crests are produced forwards 

 as far as the frontals ; the prseorbital is large, and the chain of suborbitals very 

 slender. Only the first rib is absolutely sessile, the following being attached to the 

 back of the transverse processes at a short distance from the centre ; the epipleurals 

 extend to the twelfth rib ; the last two praecaudal vertebrae form a hremal bridge. 



79. Petrochromis tanganic^e. — Gthr. 1893. 



80. Asprotilapa leptura. — Blgr. 1901. (Fig. p. 199. Middle.) 



Body rather feebly compressed, its depth 5 times in total length ; length of head 



4 times in total length. Snout sub-conical, strongly projecting beyond the mouth, 



its length \ that of the head ; eye very large, its diameter equal to length of snout 



and nearly twice interorbital width, 2| times in length of head ; width of mouth 



I that of head ; 36 teeth in outer row of upper jaw ; 3 series of small scales on 



the cheek ; larger scales on the opercle. Gill-rakers very short ; tubercle-like 15 on 



lower part of anterior arch. Dorsal XIV. 12 ; spines slender and sub-equal, § length 



of head, soft rays a little longer. Pectoral pointed, a little shorter than head. 



Ventral reaching vent. Anal III. 8 ; third spine nearly as long as dorsals. Caudal 



deeply emarginate, crescentic. Caudal peduncle 3 times as long as deep. Scales 



2 27 



strongly denticulate, 38 — ; lat. 1. — . Brown, darker on the snout and vertex ; 

 & y J 1 1 20 



a blackish opercular spot ; fins greyish. 



Total length, 95 millim. 



Described from a single specimen from Msambu. 



81. Eretmodus cyanostictus. — Blegr. 1898. (Fig. p. 187. Upper.) 



Eight or 10 transverse series of teeth in each jaw, the crowns reddish brown. 

 Depth of body equal to length of head, 3 times in total length. Profile of snout 

 curved ; length of snout \h to twice diameter of eye, which is 4^ to 5 times in length 

 of head, and a little less than interorbital width ; mouth extending to below 

 nostril ; cheeks and opercles naked. Gill-rakers short, 9 or 10 on lower part of 

 anterior arch. Dorsal XXIII. -XXV. 3-5 ; spines sub-equal from the sixth, i\ length 

 of head, a little shorter than soft rays Pectoral f length of head. Ventral reaching 

 vent. Anal III. 6-7; third spine longest, a little longer than dorsals; soft rays 



