476 SILUEID.E. 



process. Dorsal fin with I 7 rays; spine strong, straight or curved, 

 smooth in front, feebly serrated behind, f to f length of head. Adipose 

 dorsal 3 to 5 times as long as deep, originating immediately behind 

 rayed dorsal. Anal V 8-9, acutely pointed. Pectoral spine usually as 

 long as or a little longer than dorsal, not reaching base of ventral, outer 

 border feebly, inner border strongly serrated. Ventral acutely pointed, 

 reaching origin of anal or a little beyond. Caudal deeply forked. 

 Caudal peduncle deeper than long. Silvery grey or whitish, the lower 

 parts da/k brown to black ; barbels whitish, with the membranous 

 border dark brown or black ; young with ill-defined dark blotches on 

 the body, and with round dark spots on the rayed fins, forming more or 

 less regular transverse series. 



Total length 455 millim. 



Nile, Chad Basin, Senegal, Nieer. 

 1-2, 3,4. Ad. & Khiirtum. J. Petherick, Esq. {().). 



L. Loat, Esq. (C). 



■>} 

 It 

 Capt. G. B. Gosling (P.). 



M. P. Delliez (C). 



J. S. Budgett, Esq. (P.). 

 Dr. W. J. Ansorge (C). 



Major G. E. Brace (P.). 

 Dr'. W. H. Crosse (P.). 



29. MICROSYNODONTIS. 

 Bouleiig. Proc. Zool. Soc. 11)03, i. p. 26. 



Like Spiodontis, but eye without free orbital border. 



Vertebrae 36 (13 + 23), transverse process of fourth with a spheroidal 

 expansion in front. 



1. MICROSYNODONTIS BATESIl. 

 Bouleno-. 1. c. pi. iv. 



Depth of body 4§ to 6 times in total length, length of head 4 to 5 

 times. Head a little longer than broad, rugose on vertex and occiput ; 

 snout rounded; eye supcro-lateral, in middle of head, 5 (young) to 7 



