little-known African Silurid Fishes. 521 



Paris, Hamburg, and Genoa Museums, and having received 

 examples of new or rare species from the Nile and Congo, I 

 have attempted to meet a long-felt requirement by drawing 

 up original comparative descriptions of all the genera and 

 species. 



Chiloglaiiis Ptrs. Mochocus, Joannix. 



Deckonii, iV/s. iiiloticus, Joannis, 



niloticus, Bl(/r. Douniea, Sauv. 

 Eucliiliclitliys, liliir. typica, Sauv, 



Guentheri, ScliUtk. Phractura, I)l(jr. 



Dybowskii, Vaill. Bovei, PeriKjia. 



Atopocbilus, Suuu. scaiibirhynchuia, Vaill, 



Savorgnani, Sauv. Andersonia, lili/r. 



Itptura, Blyr. 



1. Chiloglanis. 



Chiloglanis, Peters, Mou. Berl. Ak. 1S68, p. 599. 



Body moderately elongate, feebly depressed. Anterior 

 dorsal entirely in advance of ventrals, formed of 1 spine and 

 5 branched rays ; an adipose fin oj)posed to the anal ; pectoral 

 with a spine ; ventral with 7 rays. A cephalo-nuchal bony 

 shield. Mouth inferior, surrounded by a very large, circular, 

 papillose lip; conical teeth on the prtemaxillaries and on the 

 vomer * ; movable, slender, curved teeth in the mandible ; a 

 maxillary and two mandibular barbels on each side ; nostrils 

 rather remote from each other, both with a valve, the ante- 

 rior tubular ; eyes small, without free border. Gill-clefts 

 short, confined to the sides. Air-bladder small, partially 

 enclosed on each side between the enlarged processes of the 

 anterior vertebrae. 



1. Chiloglanis DecJcenii. 



ChiloyUmis Derlenii, Peters, Mon. Berl. Ak. 1868, p. 599, pi. ii. ; 



PfefFer, Fische O. Afr. p. -SS, fi<r. (1890). 

 Si/)todo}iti.<i euri/sto)nu.s, Pft-ffer, .laliib. I Iamb. Wiss. Anst. vi. 1889, 



p. 14, nnd x. I'^Uo, p. ol, pi. i. liy. o. 



Body slightly depressed, its depth 5h to 6^ times in total 

 length. Head strongly dejjressed, a little longer than broad, 

 its length 3 to 3i times in total length. Eye directed up- 

 wards, in the second half of the head, its diameter about 5 

 times in length of head and H in interorbital width, which 

 equals the distance between the eye and the nostril ; two 

 widely separated oval groups of jjriemaxillary teeth, forming 

 3 or 4 transverse series ; a seiies of 6 to 8 short mandibular 



* " Praemaxillarv teetb " of Peters. 



