162 
THE TANGANYIKA PROBLEM. 
15. Clarias liocephalus. — Blgr. 
Vomerine teeth in a narrow band, without posterior process. Depth of body, 5.$ 
times in total length ; length of head, 5} times. Head smooth, covered with soft 
skin, slightly longer than broad ; occipital process very short, angular ; diameter 
of eye, 3 times in length of snout, 6 times in interorbital width ; maxillary barbel 
as long as the head, nasal barbel a little shorter ; inner mandibular barbel 2 length 
of head. Dorsal 70. Anal 50. Caudal free. Pectoral £ length of head, not 
extending to the vertical of origin of dorsal fin. Uniform blackish brown. 
Total length, 80 millim. 
Described from a single specimen from Kinyamkolo. 
16. Chrysichthys cranchi 1. — Leach, 1810. 
17. Chrysichthys myriodon. — Blgr. 1900. 
Depth of body, 4.^ times in total length ; length of head, 3J to 3.$ times. Head 
broad and much depressed, J longer than broad, rough on the vertex and occiput ; 
snout broadly rounded, scarcely projecting beyond the lower jaw, J length of head 
and twice the diameter of the eye, which is contained 6 times in the length of head 
and 2 to 2 h times in the interocular width ; the occipital process, which is rough 
like the occiput, in contact with the interspinous shield ; nasal barbel, } or 1 the 
diameter of the eye ; maxillary barbel a little more than half the length of the 
head; inner mandibular barbel, ^ length of the head, outer a little less than half. 
Vomero-pterygoid teeth very fine and closely set, as are also the premaxillary and 
mandibular teeth, forming a broad, horseshoe-shaped, uninterrupted band ; its width 
in the middle a little less than that of the premaxillary band, but increasing at the 
sides, where it much exceeds the latter. Dorsal I. 6 ; spine, rugose, not serrated, 
nearly half the length of the head and ^ to J the length of the longest soft rays. 
Adipose dorsal, a little longer than deep, its base § that of the rayed dorsal and i 
the distance which separates it from the latter. Anal IV. 8-9. Pectoral spine a 
little longer and stronger than the dorsal, feebly striated, and bearing on its inner 
edge about twenty strong retrorse serrae. Ventral not reaching the anal. Caudal 
deeply notched, with obtusely-pointed lobes, the longest rays measuring double the 
length of the median. Caudal peduncle ijj to twice as long as deep. Olive-brown 
above, white beneath. 
Total length, 470 millim. 
This description is taken from three large specimens, one received from Albertville 
by the Congo Museum, through Captain Hecq, one from Tembwi, and one from 
Kinyamkolo, obtained during the second Tanganyika expedition. Compared with 
specimens of C. cranchii of similar size, C. myriodon differs by its smaller and more 
numerous teeth, the greater posterior width of the vomero-pterygoid band, the larger 
eye and the more strongly serrated pectoral spine. It has also a higher numl»er of 
vertebrae (20-27). 
Z 2 
Some young specimens, measuring up to 130 millim., collected at Kibwesi, in 
