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. 



Chiloglanis Ptrs. Mochocus, Joannis. 



Deckenii, Ptrs. niloticus, Joannis. 



niloticus, Blgr. Doumea, Sauv. 

 Euchilichthys, Blgr. typica, Sauv. 



Guentlieri, Schilth. Phractura, Blgr. 



Dybowakii, Vaill. Bovei, Perugia. 



Atopoclnlus, Sauv. scapkirhynchura, Vaill. 



Savorgnani, Sauv. Andersonia, Blgr. 



leptura, Blgr. 



1. Chiloglanis. 



Ckiloglanis, Peters, Mon. Berl. Ak. 1868, 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 opposed 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 prsemaxillaries 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 vertebra?. 



1. Chiloglanis Deckenii. 



Chiloglanis Deckenii, Peters, Mon. Berl. Ak. 1868, p. 599, pi. ii. ; 



Pfeffer, Fiscke 0. Afr. p. 38, fig. (1896). 

 Synodoiitis eurt/stonms, Pfeffer, Jakrb. Harnb. Wiss. Anst. vi. 1889, 



p. 14, and x.' 1893, p. 31, pi. i. fig. 5. 



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

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

 its length 3 to 3^ 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 1£ in interorbital width, which 

 equals the distance between the eye and the nostril; two 

 widely separated oval groups of prajmaxillary teeth, forming 

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



* " Praeniaxillarv teetk " of Peters. 



