252 



SILURID^E. 



4. Type of 



C. gahonensis. 



5. Ad. 



6. Hgr. 



7. Hgr. 

 8-10. Yg. 



11. Yg. 



12. Hgr. 



13. Skel. 

 14-15. Ad. 

 16. Ad. 

 17-19. Types of 



C. dolloi. 



20. Ad. 



21. Yg. 



22. Hgr. 



Gaboon. 



Sette Cama, Gaboon. 

 Komadekke, Ogowe. 

 Boma, Low. Congo. 

 Stanley Pool. 



Leopoldville. 



L. Leopold IL, Upp. Congo. 

 Bikoro, L. Tumba, ,, 

 Monsembe, „ 



Upper Congo. 



Lindi R., Upp. Congo. 



Banzyville, Ubanghi. 



H. B. N. Walker, Esq. (C). 



Dr. W. J. Ansorge (C). 

 M. P. Delhez (C). 

 M. A. GreshofF (C.) ; 



Utrecht Museum (E.). 

 Drs. Button, Christy, and 



Todd (C). 

 M. P. Delhez (C). 



Rev. J. H. Weeks (P.). 



Brussels University. 

 M. M. Storms (C.) ; 



Brussels Museum (P.). 

 Capt. Royaux (C). 



21. CLARIAS BYTHIPOGON. 



Clarias hutlmpogon, Sauv. Bull. Soc. Philom. (7) iii. 1878, p. 96 ; Glinth. Ann. & 

 Mag. N. H. (6) xvii. 1896, p. 275 ; Bouleng. Poiss. Bass. Congo, p. 261 

 (1901), and Proc. Zool. Soc. 1907, p. 108^ 



Clarias gahonensis (non Giinth.), Sauv. N. Arch. Mus. (2) iii. 1880, p. 39, pi. i. 

 fig. 2. ■ 



Clarias camerunensis, Lonnb. Overs. Vet.-Ak. Forh. Stockh. 1895, p. 192. 



Depth of body 6 to 7 times in total length, length of head 4 to 4J 



tiraes. Head 1^ to 1^ times as long as broad, smooth above, or very 



finely granulate behind ; occipital process angular ; frontal fontanelle 



small, sole-shaped ; occipital fontanelle smaller, partly on the occipital 



process ; eye small, its diameter 2^ times in length of snout, 4 or 5 



times in interorbital width, which nearly equals width of mouth and 



is contained twice in length of head ; band of prsemaxillary teeth 4 to 



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



band which is as broad as or narrower than the prtemaxillary band ; 



nasal barbel as long as or a little longer than head ; maxillary barbel 



2 to 2^ times as long as head, reaching beyond base of ventral ; inner 



mandibular barbel at least as long as head, about f length of outer. 



17-22 gill-rakers on anterior arch. Clavicles concealed under the skin. 



Dorsal 78-87, its distance from occipital process 2 or j length of head, 



