322 



SILUKIDJE. 



Arius acutiveUs, Cut. & Val. Hist. Poiss. xv. p. 85 (1840) *. 

 Melanodactylus nigrodigitatus, Bleek. Nederl. Tijdschr. Dierk. i. 1863, p. 

 Chrysichthys nigrodigitatus, Giinth. Cat. Fish. v. pp. 73 & 430 (1864 



Sitzb. Ak. Wien, lx. i. 1870, p. 989, pi. vii., and Notes Leyd. Mus. 



p. 59 ; Giinth, Proc. Zool. Soc. 1899, p. 727. 

 Chrysidithys macrops, part., Giinth. Ann. & Mag. N. H. (3) xx. 1867, p. 

 Chrysichthys buttikoferi, Steind. Notes Leyd. Mus. xvi. 1894, p. 60, pi. 



Giinth. Ann. & Mag. N. H. (6) xvii. 1896, p. 276, and Proc. Zool. 



p. 721, pis. xli. & xlii. fig. A. 

 Chrysichthys ogowensis, Giinth. Proc. Zool. Soc. 1899, p. 723. 

 Chrysichthys coriscamts, Giinth. t. c. p. 724. 

 Chrysichthys lagoensis, Giinth. t. c. p. 725, and 1902, ii. p. 335, fig. 



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

 times. Head feebly depressed, 1-g- (young) to 1-| times as long 



95. 



); Steind. 

 xvi. 1894, 



112. 



iii. fig. 1 ; 



►Soc. 1899, 



H to 3| 

 as broad, 



Pig. 253. 



Chrysichthys nigrodigitatus. 

 After Sleindachner (Sitzb. Ak. Wien, 1870). 



its upper surface more or less rugose, the rugosities usually showing 

 under the thin skin ; occipital process narrow, extending to the small 



* I have examined the types of A. acutivelis =melanodactylu8 (160 millim., very badly 

 preserved) and B. maurus (195 millim.) in the Paris Museum. In both the dentition of 

 the palate is reduced to two small groups of vomerine teeth. Larger specimens (220- 

 340 millim.) from the Senegal (Heudelot) and Goree (Rang) have a small group of teeth 

 on each entopterygoid, widely separated from the vomerine. 



