60 MOKMYEID.E. 



I length of head. Caudal small, with obtusely pointed lobes. Caudal 

 peduncle twice as long as deep, ^ length of head. 120-140 scales in 

 lateral line, y between dorsal and anal, 18-20 round caudal peduncle. 

 Dark brown. 



^^^^-^.-^^^^^^ 



''"'si^K 



Isiclithys hennji. 

 S. Cameroon. |. 



Total length 205 millira. 



West x\frica, from Liberia to Mayumba, French Congo. — Type in 

 U.S. National Museum, Washington. 

 1. Ad. Sapelle, Lower Niger. Dr. W. J. Ansorge ((J.). 



2-1. Ad. Kribi R., S. Cameroon. G. L. Bates, Esq. (C). 



5-6. Ad. Eloljy, Gaboon. 



7, 8. Ad. & ligr. Gaboon. 



9. Skel. 



10. Ad. Masonia IL, Ogowe. Dr. \V. J. Agsorge (C). 



11. Hgr. W. Africa. 



4. MARCUSENIUS. 



Petrocephalufy part., Marcusen, Bull. Ac. St. Petersb. xii. 1854, p. 14, and Mem. 



Ac. St. Petersb. (7) vii. 1804, no. 4, p. 113. 

 Marmsenins, Gill, Proc. Ac. Pbilad. 1862, p. 129 ; Bonleng. Proc. Zool. Soc. 



1898, p. 792, Poiss. Bass. Congo, p. 74 (1901), and Fish. Nile, p. 40 (1907). 

 Heteromormi/rits, Steind. Verb, zool.-bot. Ges. Wien, xvi. 1866, p. 765. 

 Mormi/rus, part., Giintb. Cat. Fish. vi. p. 214 (1866). 

 H'lppojyotamijrns, Pappenh. Sitzb. Ges. naturf. Fr. Berl. 1906, p. 260, and Mitth. 



Zool. Mas. Berl. iii. 1907, p. 350. 

 Teeth in the jaws rather large or small, truncate or notched (3-9 

 upper and 6-10 lower) ; minute conical teeth on the para sphenoid and 

 on the tongue ; mouth inferior or subinferior, below the level of the eyes. 

 Nostrils widely separated. Body short or more or less elongate ; ventral 

 fins midway between pectorals and anal, or nearer the former. Dorsal 

 and anal fins subequal in length, or either the longer. Vertebrae 37- 

 48(9-16 + 4-6 + 23-30). 

 Nile and Tropical Africa. 



