LAMPEOLOGUS. 463 



2. LAMPROLOGUS TETRACANTHUS. 

 Bouleng. Ann. Mus. Congo, Zool. i. p. 118, pi. xliv. fig. 5 (1899), and Poiss. Bass. 

 Congo, p. 398 (1901) ; Pellegi-. Mem. Soc. Zool. Prance, xvi. 1904, p. 288. 



Depth of body 4 times in total length, length of head 3^ times. 

 Snout with slightly convex upper profile, a little longer than eye, which 

 is 3f times in length of head and a little exceeds interorbital width ; 

 mouth extending to between nostril and eye ; head naked ; pits of 

 sensory canals very large. Gill-rakers short, 10 on lower part of 

 anterior arch. Dorsal XX 10 ; spines increasing in length to the last, 

 wliich measures f length of head and |- longest soft rays. Anal IV 7. 

 Pectoral f length of head. Ventral produced into a filament, extending 

 a little beyond origin of anal. Caudal rounded. Caudal peduncle a 



Eiff. 315. 



Lamprologus tetracanthus. 

 Type (A. M. C). 



Q 



little longer than deep. Scales 41 j^, very small on nape and belly ; 

 lateral lines p. Dark brown; a black opercular spot; fins blackish, 

 dorsal edged with white ; light spots on the caudal. 



Total length 120 millim. 



Lake Tanganyika. — Type in Congo Museum, Tervueren. 



3. LAMPROLOGUS MARGINATUS. 

 Bouleng. Rev. Zool. A£r. iii. 1914, p. 443. 



Depth of body 3| to 4 times in total length, length of head 3^ times. 

 Snout with slightly convex upper profile, a little longer than eye, which 

 is 3i to 3f times in length of head and measures 1^ to 1^ times inter- 

 orbital width ; mouth extending to below anterior border of eye ; sides 

 of head nake.1, except a few scales on gill-cover ; pits of sensory canals 

 very large. Gill-rakers short, 6 to 8 on lower part of anterior arch. 

 Dorsal XX 11 ; spines increasing in length to the last, Avhich measures 



