ANDEBSONIA. 393 



First dorsal fin with I 6 rays, twice as distant from the root of caudal fin as from the 

 end of the snout, the first ray as long as the head, bony in its basal two-thirds, not 

 serrated. Anal fin with 10 rays. Pectoral fin three-fourths the length of the head, 

 not reaching the ventral ; the spine moderately strong, covered with minute asperities. 

 Caudal fin with crescentic notch. Caudal peduncle depressed, one-third of the total 

 length. 25 dorsal and 23 ventral scutes, the last 9 on the caudal peduncle ; the dorsal 

 scutes raised in a sharp keel on the outer border. 



Greyish above, dotted and marbled with blackish, white beneath ; four rather 

 indistinct dark bars across the back. 



Measurements (in millimetres). 



Total length 50 



„ „ (without caudal) 46 



Greatest depth 5 



Length of head 8 



Width of head 6 



Length of snout 3 



Diameter of eye 1 



Interorbital width 2 



Width of mouth 2 



Maxillary barbel 4 



Outer mandibular barbel 3 



Inner mandibular barbel 2 



Length of first dorsal ray 8 



„ pectoral fin 6 



A single specimen was found by Mr. Loat in a small pond left by the receding 

 Nile near Kosheh, Nubia (south of Wady Haifa), on March 14th, 1900. It remained 

 unique until rediscovered by Dr. F. Werner at Mongalla, Eahr-el-Gebel, in March 

 1905. By the courtesy of Dr. Werner, I have been able to compare one of the types 

 of Slatinia mongallensis with the type of Andersonia lejptura. 



3e 



