OF FISHES FfiOM LAKE TANGANYIKA. 91 



upper profile, slightly shorter than the eye, the diameter of which is 2f in length of 

 head and equals 1^ interorbital width ; maxillary extending to between nostril and 

 eye; two series of scales on the cheek; opercle naked. Gill-rakers short, 11 on lower 

 part of anterior arch. Dorsal XIII 13 ; spines slender, increasing in length to the last, 

 which is about f 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. Caudal peduncle H a slong 



as deep. Scales 35 jj ; at 1. j^. Pale brown above, yellowish beneath; fins yellow; 

 a round blackish spot on the hinder part of the spinous dorsal. 



Total length 60 millim. 



A single specimen. 



9. Ectodus melanogenys Blgr. (Plate XIX. fig. 3.) 



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

 nearly straight upper profile, 1§ 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 ; 3 series of scales on the cheek ; deciduous scales on the opercle. Gill-rakers 

 short, 12-13 on lower part of anterior arch. Dorsal XIII-XIV 17; spines slender, 

 increasing in length to the last, which is about f 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 -^', 



on oi 



lat. 1. i^zjg. 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 110 millim. 



Two specimens. — Native name : " Losorella." 



10. Ectodus longianalis, sp. n. (Plate XIX. fig. 4.) 



Depth of body 5 times in total length, length of head 3. Snout long, with slightly 

 convex upper profile, 1J diameter of e\e, which is 3^ times in length of head and 

 nearly 1 J interorbital width ; maxillary extending to between nostril and eye ; 3 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 



