AEIUS. 387 



rough with pearl-like granules ; occipital process tectiform, broader at 

 base than long, in contact with the interneural shield, which is small 

 and crescentic and studded with granules same as on the skull ; snout 

 broad, rounded, projecting feebly beyond mouth ; eye lateral, oval, 

 twice in length of snout, 6 times in length of head, 3 times in inter- 

 ocular width ; prsemaxillary band of teeth 6 times as long as broad ; 

 palate with two large subtriangular groups of villiform teeth narrowly 

 separated from each other in front ; maxillary barbel f length of head, 

 outer mandibular f , inner mandibular ^. Gill-rakers moderately long, 

 12-15 on lower part of anterior arch. Dorsal I 7, spine f length of 

 head, with granular tubercles anteriorly and small serrae posteriorly. 

 Adipose dorsal small, its base f that of rayed dorsal, If times as distant 

 from latter as from caudal. Anal 17 (12 rays branched). Pectoral 

 s])ine similar to dorsal. Ventral reaching origin of anal. Caudal 

 deeply notched, with long, pointed lobes. Caudal })eduncle twice as 

 long as deep. Olive-brown above, silvery on the sides, white beneath ; 

 distal half of dorsal, pectoral, ventral, and anal fins blackish. 

 Total lenarth 1150 niillim. 



'&' 



Niger. 



1. Hgr., type. Lokoja, Upper Niger. J. S. Budgett, Escp (P.). 



2, :'). Skels., tyi)es o£ Niger. i\lr. J. T. Dalton {C). 



A. latl.^ciitafiis. 



X AinUS HEUDELOTI. 



("nv. k Val. Hi.-t. Poiss. xv. ].. 715, j)!. eecexxviii. (ISIO). 

 Af'iKS j>i(rkii, part., (liintli. Cat. Fish. v. p. lai (1<S(;4). 

 Arinx parkii, Steind. Notes Levd. IMus, xv. 1<S1)4, ]». 'ol. 



Depth of body 5 to times in total lengtli, length of head 3J to 4 

 times. Head I5 to H times as long as broad, the posterior part of its 

 upper surface rough with pearl-like granules ; occipital process tecti- 

 form, as long as broad at base, in contact with the interneural shield, 

 which is small and crescentic and studded witli grannies same as on the 

 skull ; snout short and broad, projecting very feebly beyond mouth ; 

 eve lateral, oval, 1 to 1t\ times in lengtli of snout, 5 to G times in length 

 of head, 2o to 4 times in interocular width ; praMiiaxillary band of teeth 

 short, 4 times as long as broad ; palate with two rather small, widely 

 separated, oval or subtriangular groups of villiform teeth ; maxillary 

 barbel as long as or a little shorter than head, outer mandibular -^ to | 

 len<»th of head, inner mandibular 5 to 5. Gill-rakers moderately long, 



50 Bou I/II 



