116 



MA STACEMBELID-E. 



extremely small, about 30 betAveen origin of soft dorsal and lateral line. 

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



Total length 22 millim. 



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



2. MASTACEMBELUS FRENATUS. 



Botilent;. Ann. & Mag. N. H. (7) vii. 1901, p. 5, Poiss. Buss. Congo, p. 493 



(1901), and Tr. Zool. Soc. xvi. 1901, p. 159, pi. xx. fig. 3, and xvii. 1906, 



p. 576. 



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 3f times length of latter. Snout 3 times as long as eye, 



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



Fig. 09. 



'^m&»m 





AJastaceiiihelas frenatus. 

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



extending to below anterior border of eye ; no prseorbital or prseoper- 

 cular spines. Dorsal XVIII 85 ; spines increasing in length, last 

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

 ] I 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 with darker, yellowish 

 beneath ; 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. Type. N. end of L. Tanganyika. Prof. J. E. S. Moore (C). 



3. MASTACEMBELUS MARCHII. 



Sauv. Bull. Soc. Philom. (7) iii. 1878, p. 94, and N. Arch. Mus. (2) iii. 1880, 

 p. 36, pi. i. fig. 1 ; Bouleng. Poiss. Bass. Congo, p. 495 (1901). 



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

 Vent equally distant from end of snout and from caudal fin, its distance 



