170 THE TANGANYIKA PROBLEM. 



is 5 times in length of head and equals interorbital width ; maxillary extending 



to below anterior border of eye ; cheeks naked ; opercles and occiput scaled. 



Gill-rakers moderately long, 12 on lower part of anterior arch. Dorsal XVIII. 



io-ii ; spines slightly increasing in length to the last, which measures \ length of 



head ; longest soft rays half length of head. Pectoral half length of head. Ventral 



reaching vent. Anal V. 8 ; spines increasing in length to the last, which equals 



longest dorsal. Caudal truncate. Caudal peduncle 1^ as long as deep. Scales 



10 44 — 56 

 90-95 ; lat. 1. brown, with darker spots, having a tendency to 



form cross-bars ; caudal fin with round dark spots between the rays. 

 Total length, 113 millim. 

 Described from one specimen from Mbity Rocks, and one from Kinyamkolo. 



28. Lamprologus tretocephalus. — Blgr. 1899. 



29. Lamprologus modestus. — Blgr. 1898. (Fig., p. 181, upper.) 



A few large curved canine teeth, tipped with brown, in front of each jaw, 



followed by a band of minute teeth ; lateral teeth very small. Depth of body 3^ to 



3| times in total length, length of head 3 to 3^. Snout a little longer than diameter 



of eye, which is 3^ to 4 times in the length of the head and equals interorbital width ; 



maxillary extending to below anterior border of eye ; cheeks naked ; opercles and 



occiput scaled. Gill-rakers very short, 7 on lower part of anterior arch. Dorsal 



XX. 8-9 ; spines increasing in length to the last, which is not quite half length 



of head ; middle soft rays prolonged § to \ length of head. Pectoral about length 



of head. Ventral prolonged into a short filament. Anal V. 6-7 ; spines increasing 



in length to the last, which is as long as middle dorsals ; middle soft rays prolonged, 



like the dorsals. Caudal truncate. Caudal peduncle as long as deep. Scales 



a 5 — 6 24 — 25 



30-40 — - ; lat. 1 uniform brown ; soft dorsal and caudal fins with 



12—14 7— 11 



round black spots between the rays. 



Total length, 75 millim. 



Described from a single specimen from Mbity Rocks. 



30. Lamprologus lemairii. — Blgr. 1899. (Fig., p. 199, upper.) 



A few moderately large curved canine teeth in front of each jaw, followed by a 

 narrow band of minute teeth ; lateral teeth very small. Depth of body 3^ times in 

 total length, length of head 2§. Snout slightly longer than the diameter of the eye, 

 which is 3^ times in length of head and nearly double interorbital width ; maxillary 

 extending to slightly beyond vertical of anterior border of eye ; cheeks and occiput 

 naked; a few small deciduous scales on the opercles. Gill- rakers short, 9 on 

 lower part of anterior arch. Dorsal XIX. 7 ; spines equal from the fifth, which 

 measures a little more than ^ length of head and f longest soft rays. Pectoral 

 \ length of head. Ventral reaching origin of anal. Anal VIII. 5 ; spines 



