GYIMNARCIIUS.— XOTorTHHTD.I',. y 145 



skin connects the gill-openings across the istlimus. Dorsal 183-230. 

 Pectoral rounded, i to f length of head. Scales very small, largest 

 along the middle of the side. Olive or brown above, whitisli beneatli, 

 end of tail blackish. 



Total length 1070 millim. 



Upper Nile to Bahr-el-Ghazal, I^ake Rudolf, Chad Basin, Senegal, 

 Gambia, Niger. — Type in Paris Museum. 



1. Ad. Upper Nile. J. Petlierick, Esq. (C). 



2. Ad. Kawa, Wliite Nile. L. Loat, Esq. (i\). 

 3-(). H^r. P'ashoda, ,, 



7. Ad. Polkom, l^.aro H. (SoLat). Mr. P. C. Zapliiro (0.) ; 



W.N.McMillan,E.sq.(P.). 



8. Head of ad. Bahr-el-Ghazal. ('apt. S. Flower (P.). 

 y. Ad. Galeba, Lake Rudolf. Mr. P. C. Zaphiro (C.) ; 



W.N.McMiUan,Esq.(l'.). 



1<^. Ad. R. Shari at Maidugari, Capt. G. B. Gosling C P.). 



11-14. Ad. & hgr. Kaedi, Senegal. M. P. Delhcz (0.)." 



15. Skel. Lagos. Sir A. Moloney (P.). 



1<^- Y<r. Oguta, Lower Niaer. Dr. W. J. Ansorge (C). 



17-18. Yg. Assay, „ J. S. Budgett, Esq. (P.). 



19, 20. Ad., stuffed Niger. Mr. J. T. Dalton (C). 



(skull separate) . 

 21. Hu^r 



22-26. Yg. West Africa. 



Fam. 3. NOTOPTERID.E. 



Margin of the upper jaw formed by the preemaxillaries and the 

 maxillaries, the latter the more developed; parietal bones separatiuf 

 the supraoccipital from the frontals ; a large hole on each side of the 

 skull, between the squamosal, the exoccipital, and the epiotic ; sym- 

 plectic present; no suboperciilum ; interoperculiim small, hidden under 

 the praeoperculum. No pharyngeal teeth. Bibs sessile ; accessory 

 bones (adpleurals) attached to the extremity of the anterior ribs, with 

 which they may be fused, and embraced by ossifications formin*'- a 

 double ventral serrature ; praecaudal vertebrae with transverse processes 

 in front of the ribs. Pectoral fins folding against the sides of the body. 

 Air-bladder communicating with the ear. No oviducts. 



Fresh and brackish waters of S.E. Asia and Tropical Africa. 



Two genera : — 



Dorsal fin present 1, Notopteriis, Lacep., p. 146. 



No dorsal iln 2. Xenomt/stus, Gthr., p. 147. 



VOL. I. L 



