1 88 THE TANGANYIKA PROBLEM. 



length of head and equals \h 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, § 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. — BIgr. 1 898. (Fig. p. 1 93, middle.) 

 Depth of body 5 to $\ times in total length, length of head 3^. Snout long, with 



nearly straight upper profile, if 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 



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 branchiostegal 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, ik 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 3 length of head ; soft rays slightly longer, 

 the last not produced. Anal III. 17; third spine 5 length of head. Pectoral 

 pointed, % length of head. Ventral nearly reaching origin of anal. Caudal deeply 



31 

 emarginate. Caudal peduncle twice as long as deep. Scales 44^ ; lat. 1 j.' 



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. 



