SYNODONTIS. 



359 



postocular part of the head ; frontal fontanelle rather large ; eye superolateral, its 

 diameter four (young) to six times in the length of the head, and once and two-thirds 

 to three times in the width of the interorbital region, which is feebly convex ; occiput 

 simply convex. Mouth with moderately developed lips ; prsemaxillary teeth forming a 

 short and broad band ; movable mandibular teeth not more than half the diameter of 

 the eye, 33 to 48 in number. Maxillary barbel with a rather narrow but very distinct 

 marginal membrane in its proximal fourth, once and one-fifth to once and three-fourths 

 the length of the head, reaching the middle or the end of the pectoral spine ; outer 

 mandibular barbel inserted a little farther back than and one-half or not quite 

 one-half the length of the inner, the former with long, slender branches, the latter with 



Measurements (in millimetres). 



2. 



3. 



4. 



5. 



6. 



7. 



8. 



9. 



250 



235 



200 



185 



175 



150 



100 



77 



81 



70 



64 



51 



54 



50 



27 



25 



74 



70 



60 



55 



53 



47 



30 



25 



57 



55 



45 



45 



39 



38 



24 



20 



31 



30 



26 



24 



22 



20 



13 



10 



12 



12 



11 



10 



10 



10 



7 



5 



38 



34 



29 



26 



26 



23 



13 



11 



22 



21 



17 



15 



15 



14 



9 



8 



92 



90 



94 



73 



67 



71 



46 



30 



60 



49 



57 



45 



40 



40 



25 



22 



28 



20 



25 



22 



18 



18 



12 



10 



61 



65 



54 



56 



50 



47 



29 



24 



34 



35 



30 



27 



25 



25 



14 



12 



76 



75 



65 



58 



59 



50 



34 



25 



28 



19 



16 



18 



16 



20 



10 



6 



60 



61 



48 



50 



47 



45 



27 



21 



1. 



Total length (without caudal) 290 



Greatest depth 82 



Length of head ! 84 



Width of head 65 



Length of snout 36 



Diameter of eye 14 



Interorbital width 42 



Width of mouth \ 28 



Maxillary barbel 106 



Outer mandibular barbel | 63 



Inner mandibular barbel I 28 



Length of dorsal spine 63 



Basal length of dorsal fin 43 



„ ,, adipose fin 90 



Greatest depth of adipose fin 25 



Length of pectoral spine l 64 



1, 2. Lake No.— Loat. 



3. Bahr Zeraf. — Flower. 



4. 7. Gharb-el-Aish. — Loat. 



5. L. Rudolf. — Zaphiro. 



6. Gondokoro. — Loat. 



8. Fashoda. — Loat. 



9. Between Khartum and Sobat. — Zaphiro. 



