AEitrs. 3S7 



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 J. Gill-rakers moderately long, 

 12-15 on lower part of anterior arch. Dorsal 1 7, spine -f length of 

 head, with granular tubercles anteriorly and small serrse posteriorly. 

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

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

 spine similar to dorsal. Ventral reaching origin of anal. Caudal 

 deeply notched, with long, pointed lobes. Caudal peduncle twice as 

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

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



Total length 1150 millim. 



Niger. 



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



2, 3. Skels., types o£ Niger. Mr. J. T. Dalton (C). 



A. latiscutatus. 



3. ARIUS HEUDELOTI. 



Gnv. & Val. Hist. Poiss. xv. p. 73, pi. ccccxxviii. (18-40V 

 Arius parkii, part., Giintli. Cat. Fish. v. p. 15-4 (1861). 

 Arias parlcii, Steind. Notes Leyd. Mns. xv. 1894, p. (31. 



Depth of body 5 to 6 times in total length, length of head 3| to 4 

 times. Head \\ to 1^ 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 with granules same as on the 

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

 eye lateral, oval, 1 to 1\ times in length of snout, 5 to 6 times in length 

 of head, 2\ to 4 times in interocular width ; prremaxillary 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 f 

 length of head, inner mandibular ^ to §-. Gill-rakers moderately long, 



2c2 



