OF FISHES FROM LAKE TANGANYIKA, 23 
I. Vent nearly equally distant from the end of the snout and the base of the caudal fin. 
A. Two strong preopercular spines. 
D. XXIII-XXIV 75; A. IL 75-76; length of head (measured to extremity of opercle and without 
rostral appendage) hardly twice in its distance from vent and 6 times as great as its 
distance from the first dorsalspme . . . . Boo o 6 LG Weamitim Spin. 
D. XXIV 100; A. II 100; length of head 34 times in its distance from vent, equal to its distance 
from the first dorsal spine. . . é 0 € . . . & M. cryptacanthus Gthr. 
D. XXVII85; A. III 92; length of Hed OL in its distaties from yent, 3 times as great as its 
distance from first ovens Goll 6 6 5» o 6 6 5 6 8 9 Gb JUL Waren eae 
ID APXeXGV I XOXOXG SOAR LT SO) nes cee AC eMenitbersensta Blatt: 
D. XXIX-XXX 117-180; A. II 117- 127; length of head nearly 4 times in its distance from 
vent, and nearly twice as great as its distance from the first dorsal spine. 
M. loennbergii Blgr.’ 
B. Preopercular spines minute (young) or absent. 
D. XXVII-XXVIII 70-80; A. II 80-90; length of head 3 to 4 times in its distance from vent, 
equal to or a little less than its distance from the first dorsal spine. 
6. M. flavomarginatus Blgr.* 
D. XXVII 80-82; A. II 60-65; length of head equal to its distance from the first dorsal spine. 
7. M. niger Sauv. 
D. XXVII-XXIX 65-70; A. II 68-75; length of head 24 to 3 times in its distance from the 
vent, and 4 in its distance from the first dorsal spme. . . 8. M. shiranus Gthr. 
D. XXIX 95; A. II 85; length of head 3 times inits distance from the vent, and 4 in its distance 
from the first dorsal spme. . . . . 9. M. nigromar: rina Blgr.’ 
D. XX V-XXVII 70-80; A. II 70-80 ; Ment of het ‘aries in its distance from the vent, and 
nearly 2 in its distance from the first dorsal spme. . . . 10. I. moorii Blgr. 
II. Vent much nearer the caudal fin than the end of the snout; one or two preopercular 
spines. 
1D), OKO hy g: JNy HUY) i Geo oo oe wl) LL ME mormoratus Perugia,” 
D. XXXIII-XXXV 50-60; A. II 50-60 . AP pea atc . . 12. WM. tanganice Gthr. 
TII. Vent much nearer the end of the snout than ie caudal fin. 
DPT OCKUILOS--A TING . 2 2a) .ca0e 2 Les Wiophidiem) Gthr- 
‘ A species from the Upper Congo founded on a single specimen with mutilated tail and regenerated caudal 
fin. I have now a perfect specimen. 
2 M. marchii Steind. nec Sauv.—Liberia. 
° M. eryptacanthus Loennberg nec Gthr.—Cameroon. 
4 A new species founded on specimens from the Gaboon previously referred to WM. eryptacanthus. 
+ A new species founded on a single specimen from Ashantee. 
® Type examined.—Vent equally distant from the head and from the caudal; head once and a half as loug 
as its distance from the first dorsal spine; 17 scales between origin of soft dorsal and lateral line. 
