1 88 
THE TANGANYIKA PROBLEM. 
length of head and equals i£ interorbital width; maxillary extending to between 
nostril and eye; two series of scales on the cheek; opercle naked. Gill-rakers 
short, ii on lower part of anterior arch. Dorsal XIII. 13 ; spines slender, increas- 
ing in length to the last, which is about | length of head and little shorter than the 
soft rays. Anal III. 8; third spine slightly shorter than longest dorsals. Pectoral 
obtusely pointed, 5 length of head. Ventral reaching vent. Caudal emarginate. 
3 27 
Caudal peduncle ii as long as deep. Scales 35 — ; lat. 1 — . Pale brown above, 
yellowish beneath ; fins yellow ; a round blackish spot on the hinder part of the 
spinous dorsal. 
Total length, 60 millim. 
Described from a single specimen. 
54. Ectodus melanogenys. — Blgr. 1898. (Fig. p. 193, middle.) 
Depth of body 5 to 5 [ times in total length, length of head 3^. Snout long, with 
nearly straight upper profile, ii| diameter of eye, which is 4 times in length of 
head, and equals or slightly exceeds interorbital width ; maxillary extending to 
between nostril and eye ; three series of scales on the cheek ; deciduous scales on 
the opercle. Gill-rakers short, 12 to 13 on lower part of anterior arch. Dorsal 
XIII. -XIV. 17; spines slender, increasing in length to the last, which is about $ 
length of head ; last soft rays produced, at least half length of head. Anal 
III. 13 ; third spine ^ length of head. Pectoral pointed, a little shorter than head. 
Ventral reaching origin of anal. Caudal deeply emarginate. Caudal peduncle 
3 — 4 3° — 3 1 
twice as long as deep. Scales 43-44 ; lat. 1 Grey above, white 
below ; dorsal scales with a pale blue central spot ; a blackish opercular spot ; chin 
and branch iostegal membrane blackish ; dorsal grey, with whitish streaks and spots, 
and a large oval blackish spot in the middle of the spinous portion ; anal grey, 
streaked with whitish ; pectoral and caudal yellowish, the latter with crescentic 
dark bands ; ventral blackish at the end. 
Total length, no millim. 
Described from two specimens. Native name, “ Losorella.” 
55. Ectodus longianalis. — Bouleng. 1899. (Fig., pp. 205 and 175.) 
Depth of body 5 times in total length, length of head 3. Snout long, with 
slightly convex upper profile, ii diameter of eye, which is 3^ times in length of 
head and nearly 1^ interorbital width ; maxillary extending to between nostril and 
eye ; three series of scales on the cheek ; deciduous scales on the opercle. Gill- 
rakers short, 12 on lower part of anterior arch. Dorsal XV. 15; spines slender, 
increasing in length to the last, which is \ length of head ; soft rays slightly longer, 
the last not produced. Anal III. 17 ; third spine \ length of head. Pectoral 
pointed, % length of head. Ventral nearly reaching origin of anal. Caudal deeply 
emarginate. Caudal peduncle twice as long as deep. Scales 44;! ; lat. 1 
3 » . 
17—18 
Brownish above, whitish beneath ; a blackish opercular spot ; a lateral series of 
rather indistinct dark spots ; dorsal greyish ; other fins yellow. 
Total length, 97 millim. 
