GOBIUS. 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. G. giuris, Hani. Buch., j>. 24. 



Sc. 40-46 ; D. 8-9 ; A. 8-9 ; lower jaw pro- 

 jecting ; month extending to below 

 anterior third or centre of eye . . 2. G. rhodoptevus. Gthr.. p. 26. 



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 3. G. dewaalii, 11. Web., p. 26. 



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 5^ times in total length ... 4. G. maindroni, Sauv., p. 27. 

 Sc. 55—56 ; interorbital width about \ diameter 



of eye ; lower jaw projecting ; depth of 



body 4 times in total length ; body 



entirely scaly 5. G. gilchristi, Blgr., p. 27. 



Sc. 56-60; interorbital width about \ diameter 



of eye ; lower jaw projecting; depth o£ 



body 5 times in total length ; anterior 



part of back naked 6. G. nudiceps, C. & V., p. 28. 



Sc. 65 ; interorbital width equal to diameter of 



eye ; upper jaw slightly projecting ; depth 



of body 4J- times in total length . . . 1 . G. histamantcei, Greeff, p. 29. 



b. Head 1£ to 2 times as long as broad. 



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

 front. 

 Sc. 60 ; mouth extending to below centre of [p. 20. 



eye; small scales on the cheek .... 8. G. madaga&cariensh, Blkr., 

 Sc. 65 ; mouth extending to below posterior 



border of eye ; cheek naked 9. G. macrorhynclms, Blkr., p. 20. 



/3. Mouth subinferior, extending to below anterior border of eye or 

 not quite so far. 

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

 meter of eye in adult ; depth of body 5 to 



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



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

 of eye ; depth of body 6 to 7 times in 

 total length 11. G. guineensis, Peters, p. 31. 



