MOEMTRUS. \ 127 



elongate, more than twice as long as the anal. Vertebrae 49-55 

 (12-16 + 7-10 + 27-32). 

 Nile and Tropical Africa. 



SynoiJsis of the Species. 



I. Snout much shorter than postorbital part of head. 



A. Dorsal originating in advance of base of ventrals, 4 to 5 times as long as 



anal ; caudal petl uncle 1^ to 2 times as long as deep. 

 D. 67-75 ; A. 17-20 ; 28-30 scales round 



caudal peduncle I. M. hasselquistii, C. & V., p. 128. 



D. G2-6Q ; A. 18-20 ; 22-26 scales round 



caudal peduncle 2. M. anchieke, Guimar., p. 129. 



B. Dorsal originating above base of ventrals ; caudal peduncle 2^-3 times as 



long as deep. 

 D. 64-65 ; A. 19-21 ; 12 scales round 



caudal peduncle ; dorsal 4 to 4^ times 



as long as anal ; snout not longer 



than eye 3. il/. macrophthalmus, Gthr., p. 130. 



D. 53-55 ; A. 22-23 ; 16 scales round 



caudal peduncle ; dorsal 2| to 3 times 



as long as anal ; snout twice as long 



as eye 4. M. ovis, Blgr., p. 131. 



II. Snout at least nearly as long as postorbital part of head. 



A. Dorsal originating above, or a little in front, or a little behind base of 



ventrals. 



1. A. 22-27 ; 12-14 scales round caudal peduncle, which is 2^-3 times as 



long as deep ; dorsal 2| to 3 times as long as anal. 

 D. 60-70 ; A. 22-26 ; snout not tubiform ; 



pectond rounded, not or barely reach- 



ino- root of ventral 5. M. cahallus, Blgr., p. 132. 



D. 65-67 ; A. 27-28 ; snout tubiform ; 



pectoral pointed, reaching a little 



beyond root of ventral 6. M. tapirus, Pappenh., p. 133. 



2. A. 18-21 ; 26-30 scales round caudal peduncle, which is 1^-2 times as 



long as deep ; dorsal 3^ to 4| times as long as anal. 

 D. 60 ; A. 19 ; dorsal originating further 



back than base of ventral .... 7. AJ. tenuirostris, Peters, p. 134. 

 D. 57-75 ; A. 18-21 ; dorsal originating 



above or in front of base of ventral . 8. M, hannume, Forsk., p. 134. 



B. Dorsal originating considerably in advance of ventrals, 5 to 7 times as long 



as anal. 

 1. 26-30 scales round caudal peduncle ; D. 76-90. 



