2 IO 
THE TANGANYIKA PROBLEM. 
Anal III. 7-8; third spine longest, as long as longest dorsal. Caudal truncate. 
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 prcemaxillary and mandibular bones are very massive, and the maxillary is 
much reduced in size ; the ascending processes of the pnemaxillaries 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 pneorbital 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 pnecaudal vertebra; form a haemal bridge. 
79. PetROCHROMIS TANGANIC7E. — 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 J that of the head ; eye very large, its diameter equal to length of snout 
and nearly twice interorbital width, 2'' s times in length of head ; width of mouth 
| 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 ; 
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 to twice diameter of eye, which is 4J 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 ij length of head. Ventral reaching 
vent. Anal III. 6-7; third spine longest, a little longer than dorsals; soft rays 
