1907.] AFRICAN SILURID FISHES. 1079' 



distant from base of caudal as from end of snout. Caudal | lengtb 

 of head. Dark brown, lighter beneath. 



Total length 285 miUim. 



Fernando Po. A single specimen, from Mr. E. Seimund's 

 collection. 



14. Clarias submarginatus. 



Peters, Sitzb. Ges. Naturf. Fr. Berl. 1882, p. 74. 

 Depth of body 6 to 6| times in total length, length of head 



4 to 5 times. Head once and j as long as broad, smooth ; occipital 

 process pointed ; frontal fontanelle knife-shaped, 2g to 3 times as 

 long as broad ; occipital fontanelle smaller, slightly encroaching 

 on the occipital process ; eye very small, 3 times in length of 

 snout, 7 times in interorbital width, which equals width of 

 mouth and ^ length of head ; band of prtemaxillary teeth 4| or- 



5 times as long as broad ; vomerine teeth conical, forming a 

 curved band which is as broad as the prsemaxillary band ; nasal 

 barbel about | or | length of head, maxillary once and ^ to once 

 and |, outer mandibular once, inner mandibular 4. Gill-rakers 

 very few, 10 on anterior arch. Clavicles concealed under the 

 skin. Dorsal 75-84, its distance from occipital process f length 

 of head, its distance from caudal equal to or a little greater 

 than diameter of eye. Anal 60-70, also separated from the 

 caudal. Pectoral ^ length of head, the spine very feebly serrated 

 on outer side and about | the length of the fin. Ventral once 

 and ^ as distant from base of caudal as from end of snout. 

 Caudal g length of head. Dark brown, lighter beneath ; a dark, 

 light-edged curved band on the caudal. 



Total length 210 millim. 



Two specimens, from the Ja River, in S. Cameroon, were 

 obtained by Mr. Bates. 



The type specimens (young) preserved in the Berlin Museum,, 

 and on which I have notes furnished me by the late Prof. 

 Hilgendorf , are from the ' Tooxlong River ' in West Africa, 

 a river which I have not been able to trace but which is 

 probably somewhere in the Cameroon or Gaboon district. 



15. Clarias liocephalus. 



Clarias liocephalus^ Bouleng. Tr. Zool. Soc. xv. 1898, p. 24,, 

 pi. vii. fig. 2, and Poiss. Bass. Congo, p. 257 (1901). 



Depth of body 5| to 7 times in total length, length of head 4^ 

 or 5 times. Head 1|-1^ times as long as broad, smooth ; occipital 

 process angular ; fontanelles feebly distinct, occipital in advance 

 of occipital process ; eye small, 3 times in length of snout, 5 to 6 

 times in interorbital width ; width of mouth equal to interorbital 

 width, 4 length of head ; vomerine teeth conical, forming a 

 crescentic band which is about as broad as the prsemaxillary 

 band ; nasal barbel f to | length of head ; maxillary barbel as 

 long as head or a little longer, extending to middle or extremity 



