GOBTUS. 23 



Scales 30-36 in longitudinal series ; dorsal 



with 9 branched rays, anal with 8 ; lower 



jaw projecting ; mouth extending to below 



anterior border of eye, or not quite so far. 1. (7. giuris, Ham. Buch., p. 24. 

 So. iO-ii) ; D. 8-9 ; A. 8-9 ; lower jaw pro- 

 jecting ; mouth extending to below 



antei-ior third or centre of eye . . . . 2. G. rhodopterus. Gthr., p. 2G. 

 Sc. 26 ; D. 9 ; A. 9 ; mouth subinferior, ex- 

 tending beyond vertical of posterior border 



of eye ; a curved canine tooth on each 



side of lower jaw ?,. G. dewaalU, M. ^Yeh., t[>. 2G. 



2. Dorsal and anal with 10 or 11 branched rays. 



a. Head not much longer than broad ; mouth extending to below 

 anterior border of eye. 

 Sc. 34-37 ; interorbital width not ^ diameter 



of eye; jaws equal in front; depth of 



body 5 to 5J times in total length . . . i. G. maindroni, Sauv., p. 27. 

 Sc. 55-56 ; interorbital width about J diameter 



of eye; lower jaw projecting; depth of 



body 4 times in total length ; body 



entirely scaly 5. 6?. ^i/c/tm^i, Blgr., p. 27. 



Sc. 56-60 ; interorbital width about I diameter 



of eye; lower jaw projecting; depth of 



body 5 times in total length ; anterior 



part of back naked G. G. nudiceps, V. & V., p. 28. 



Sc. 65; interorbital width equal to diameter of 



ere ; upper jaw slightly projecting ; depth 



of body 4 J- times in total length ... 7. G.hustamMitm, Greeff, p. 29. 



I. Head 1^ to 2 times as long as broad. 



a. Mouth extending to below centre of eye or beyond ; jaws equal in 

 front. 

 Sc. 60 ; mouth extending to below centre of [p. 29. 



eye; small scales on the cheek .... 8. G. madagascariensis, YiWiw, 

 Sc. 65 ; mouth extending to below posterior 



border of eye ; cheek naked 9. (r.macror/jyncAtis, Blkr., p. 29. 



yS. Mouth subinferior, extending to below ant-erior border of eje or 

 not quite so far. 

 Sc. 58-64 ; interorbital widldi equal to dia- 

 meter of eye in adult ; depth of body 5 to 



6 times in total length 10. (J. ceneofuscus, Peters, p. 30. 



Sc. 61-70 ; interorbital width ^ to g diameter 

 of eye ; depth of body 6 to 7 times in 

 total length 11. G . ffuuieenals, Teters, ^i. dl. 



