214 
TIIE TANGANYIKA TROT LEM. 
MASTACEM BELI D/E. 
86. Mastacembelus frenatus. — Blgr. 1901. (Fig. p. 215. Upper.) 
Depth of body 13 times in total length, length of head Sj$ times. Vent equally 
distant from end of snout and from caudal fin, separated from head by a space equal 
to 3§ times length of latter. Snout 3 times length of eye, produced into a trifid 
appendage, the length of which exceeds a little diameter of eye ; buccal 
cleft extending to below anterior border of eye ; no prmopercular spines. 
Dorsal and anal confluent with caudal, which is short and rounded ; 
dorsal XVIII. 85; anal n-90; first spine very short, second $ length of head; 
distance between first dorsal spine and head 1 ?, times length of latter. Pectoral ? 
length of head. Scales extremely small, 22 between origin of 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. 
Total length, 250 millim. 
Described from a single specimen, a female full of ova from the north end of 
Lake Tanganyika. 
87. Mastacembelus moorii. — Blgr. 1898. (Fig. p. 215. Lower.) 
Depth of body 14 times in total length, length of head (without rostral appendage) 
6 }i times ; vent equally distant from end of snout and base of caudal ; length of 
head 2.} to 3 times in its distance from vent, and i in its distance from first dorsal 
spine. Snout 3 times as long as eye, ending in a trifid dermal appendage which 
is a little longer than eye ; cleft of mouth extending to below centre of eye ; no 
pneopercular spines. Vertical fins united with the rounded caudal. Dorsal XXV.- 
XXVII. 70-80; spines very short. Anal II. 70-80. Pectoral 4 length of head. 
Scales very small, 30-35 between origin of soft dorsal and lateral line. Brown, tail 
with a wide-meshed blackish network ; dorsal and anal whitish ; with a vertical 
series of blackish spots or vertical bars ; anal and caudal edged with blackish. 
Total length, 440 millim. 
Described from two specimens from Mbity Rocks. 
This species has been compared with M. marmoratus , Perugia, from the Congo, 
which differs in the more slender body (its depth contained 20 times in the total 
length) with larger scales, the shorter tail, the longer rostral appendage (measuring 
twice the diameter of the eye), and the higher number (30) of dorsal spines. 
88. Mastacembelus ellipsifer. — Blgr. 1899. 
89. Mastacembelus tanganica:. — G hrt. 1893. 
