Fishes from Lake Tanganyika. 367 
Chrysichthys grandis. 
Depth of body 4 to 42 times in total length, length of 
head 3 to 34 times. Head much flattened, as long as broad, 
smooth ; occipital process in contact with interneural shield ; 
snout broadly rounded, projecting very feebly beyond mouth; 
eye 8} to 10 times in length of head and 32 to 5 times in 
interocular width ; width of mouth 13 times in length of 
head; band of premaxillary teeth feebly curved, 74 to 8 
times as long as broad; vomero-pterygoid teeth in a long 
and rather broad band narrowly interrupted in the middle. 
Nasal barbel 13 to 12 times diameter of eye, maxillary 
barbel 4 to 2 length of head, outer mandibular}. Gill- 
rakers moderately long, 11 or 12 on lower part of anterior 
arch. Dorsal I 6, equally distant from end of snout and 
from caudal; spine small, smooth, about + length of head. 
Adipose dorsal twice as long as deep, as long as or a little 
shorter than rayed dorsal, from which it is separated by a 
space 24 to 3 times its length. Anal IV 8. Pectoral spine 
4 to 4 length of head, feebly serrated on inner side. Caudal 
notched, with rounded lobes, longest rays about twice as 
long as median. Caudal peduncle hardly 14 times as long 
as deep. Dark brown; belly white. 
Total length 570 mm. . 
Kilewa Bay. 
Near C. myriodon, Blgr., but head smooth, band of teeth 
on the palate narrower on the sides, nasal barbel longer, 
dorsal and pectoral spines shorter. 
Synodontis dhonii. 
Depth of body equal to length of head, 3} times in total 
length. Head 14 times as long as broad, with strong 
granular asperities between and behind the eyes; snout 
obtusely pointed, a little longer than postocular part of head ; 
eye supero-lateral, 9$ times in length of head, 84 times in 
interorbital width; lips moderately developed ; mandibular 
- teeth $ diameter of eye, 20 in number, forming a transverse 
series. Maxillary barbel not margined, nearly 2 length of 
head; mandibular barbels with few and slender branches. 
Nuchal shield tectiform and very rugose like the occiput, a 
little longer than broad, with obtuse posterior processes. 
Humeral process rugose, granular, not keeled, twice as long 
as broad, rounded. Dorsall 7 ; spine strong, finely striated, 
serrated behind. Adipose dorsal low, 5 times as long as 
