]K) 



MASTACEMBELID.E. 



extremely small, about 30 between origin of soft dorsal anil lateral line. 

 Brownish, with darker spots on the pectoral and anal fins. 



Total length 22 millim. 



Lower Congo (Matadi). — Type in Congo Museum, Tcrvueren. 



2. MASTACEMBELUS FHENATUS. 



Bouleiifj. Ann. &. Mao. N. H. (7) vii. I'JOl, p. ">, Poiss. Bass. Congo, p. 41).'? 

 (r.tOJ), and Tr. Zool. Soc. xvi. I'.IOl, p. 150, pi. xx. fig. 3, and xvii. IWd, 

 p. 57G. 



Depth of body 13 times in total length, length of head 8| times. 

 Vent nearly equally distant from snout and from caudal, its distance 

 from head 3| times length of latter. Snout 3 times as long as eye, 

 ending in an appendage which is a little longer than eye ; mouth 



-yj-'-'^'' V«' ' I f ' ''i 



Mastaceiuhelus frenatas. 

 Type (Tr. Z. S. 1901). |. 



extending to below anterior border of eye; no pncorbital or prajoper- 

 cular s[)ines. Dorsal XVllI 85 ; spines increasing in length, last 

 nearly twice as long as eye ; distance between first spine and head 

 H length of latter. Anal II 90. Caudal rounded. Pectoral f length 

 of head. Scales very small, 22 between origin of soft dorsal and 

 lateral line. Yellowish brown above, marbled witli darker, yellowish 

 beneatli ; a dark brown streak on each side of the head, passing through 

 the eye; two brown bars across the caudal fin. 



Total length 250 millim. 



Lake Tanganyika. 

 1. Tvpe. N. end of L. Tanganyika. Prof. J. K. t;. Moore (C). 



3. MASTACEMBELUS MABCIIII. 



Sauv. Bull. Soc. Philoin. i^l) ill. 1878, p. 94, and N. Aivli. Mui*. (2) iii, 1880, 

 p. 3f), pi. i. fig. 1 ; Bouleng. Poiss. Ba.ss. Congo, p. 4'J,J (I'JUl). 



Depth of body 10 to 12 times in total length, length of head 5| times. 

 Vent ecjually distant from end of snout and from caudal fin. its distance 



