148 



XOTOPTERID.E.— OSTEOGLOSSID.E. 



Anal 108-130 (including caudal). Pectoral as long as head or a little 

 shorter. Ventral serrature formed of 26-30 pairs of spines. Lateral line 

 120-142. Brownish, uniform or with fine darker longitudinal streaks. 



Total length 200 millim. 



Bahr-el-Gebel and Bahr-el-Zeraf, Chad Basin, Liberia, Niger, Gaboon, 



Congo. 



Fig. V20. 



Dr. F. Werner (P.). 



Capt. G. B. Gosling (P.). 



Mr. L. Fraser (C). 



E. B. N. Walker, Esq. (P.). 



Miss Kingsley (C). 



Dr. W. J. Ansorge (C). 



M. De Meuse (C). 



M. Lu3a(C.). 



M. P. Delhez (C). 



Rev. J. H. Weeks (P.). 

 Brussels University. 

 Capt. Royaux fC.j. 



Fam. 4. OSTEOGLOSSID^. 



Margin of the upper jaw formed by the praemaxillaries and the 

 mamillaries, the latter the more developed ; nasal bones large and in 

 contact with each other ; parietal bones separating the supraoccipital 

 from the frontals ; suboperculum much reduced and entirely or partially 

 concealed under the prse operculum. No pharyngeal teeth. Eibs 

 inserted on the strong parapophyses ; epipleurals, no epineurals. 

 Pectoral fins low down, folding against the belly. Head scaleless, the 



