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. 
10-11 ; 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 lh as long as deep. Scales 
90-95 10 ; lat. 1. ^ — --- brown, with darker spots, having a tendency to 
22 — 2o 20 — 30 
form cross-bars ; caudal fin with round dark spots between the rays. 
Total length, 1 1 3 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, lipped with brown, in front of each jaw, 
followed by a band of minute teeth ; lateral teeth very small. Depth of body 3J to 
3! times in total length, length of head 3 to 3L 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 
36-40 — — — ; 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 2J. Snout slightly longer than the diameter of the eye, 
which is 3J 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 J longest soft rays. Pectoral 
2 length of head. Ventral reaching origin of anal. Anal VIII. 5; spines 
