SYN0D0NT1S. 



407 



162-163. Hgr. 



164. Ad. 

 16.5. Yg. 

 166-169. Yg. 



170. Ad. 

 171-175. Ad. 

 176. Ad. 

 177-179. H £ r. 



Nur-ed-Daim and Kaka, 



White Nile. 

 Gharb-el-Aish, White Nile. 

 Fashoda, White Nile. 

 Between Khartum and 



Sobat. 

 Polkom, Baro R. 

 Mouth of L. No. 

 Gondokoro. 

 Sagan B. (L. Rudolf). 



180-182. Hgr. L. Gandjule (Margherita). 



183. Hgr. L. Stephanie. 



184. Ad., type of 

 *S'. smithii. 



185. Yg. Komadngu R., L. Chad. 

 186-188. Ad. St. Louis, Senegal. 

 189-191. Ad., hgr., Kae'di, 



& yg- 



192. Hgr. Senegal. 



L. Loat, Esq. (C). 



Mr. P. C. Zaphiro (0.) ; 

 W. N. McMillan, Esq. (P.). 



L. Loat, Esq. (C). 



Mr. P. C. Zaphiro (C.) ; 

 W.N. McMillan, Esq. (P.). 



Dr. Donaldson Smith (C). 



Paris Museum (E.). 

 M. P. Delhez (C.). 



7. SYNODONTIS GAMBIENSIS. 

 Giinth. Cat. Fish. v. p. 214 (1864). 



Depth of body 3 to 4 times in total length, length of head 3^ to 3f 

 times. Head 1-^ to 1J times as long as broad, rugose above behind 

 snout, which is rounded or obtusely pointed and as long as or a little 

 longer than postocular part of head ; eye supero-lateral, 4 (young) to 

 5-| times in length of head, 1| to 2^ times in interorbital width; lips 

 moderately developed ; praemaxillary teeth forming a short and broad 

 band ; movable mandibular teeth not h diameter of eye, 20 to 35 in 

 number. Maxillary barbel with a narrow marginal membrane at base, 

 1 to 1|- times length of head, reaching between anterior fourth and 

 middle of pectoral spine; outer mandibular barbel about twice as long 

 as inner, former with long, slender branches, latter with shorter branches, 

 with tubercular ramifications. Gill-openings not extending downwards 

 beyond root of pectoral spine. Occipito-nuchal shield rough like the 

 occiput, obtusely tectiform, 1^ to If times as long as broad, with 

 posterior processes pointed or rounded. Humeral process longer than 

 broad, without or with very obtuse keel, sharply pointed, not extending 

 quite so far back as occipito-nuchal process. Dorsal I 7 ; spine nearly 

 as long as head, straight or feebly curved, usually terminating in a rather 



