GNATHONEMITS. 95 



** No mental appendage. 

 D. 17-20; A. 25-28 ; L. 1. 51-58 ; depth 



of body 3i-3| times in total length . . 6. G. niger, Gthr., p. 101. 

 D. 24-25 ; A. 30-31 ; L. I. 55-60 ; depth 



of body 3J-4 times in total length . . 1. G. leopoldiamis, BIgr., p. 102. 



/3. Caudal peduncle 2J-3 times as long as deep. 

 * Depth of body 5-5^ times in total length. 



D. 19 ; A. 31 ; L. 1. 65 8. G.friteli, Pellegr., p. ; 103. 



D. 23 ; A. 34 ; L. 1. 58 9. G. bentleyi, Blgr., p. 103. 



** Depth of body 3-4 times in total length. 

 D. 21-24; A. 28-31 ; L. 1. 62-65 . . . . 10. G. limngstonii, Blgr., p. 104. 



D. 26 ; A. 33 ; L. 1. 55 11. G. bruyerii, Pellegr., p. 105. 



D. 28-33 ; A. 36-43 ; L. 1. 75-80 ; a round 



or oval mental appendage 12. G. monteiri, Gthr., p. 105. 



y. Caudal peduncle 4 times as long ns deep. 

 D. 29-33 ; A. 36 ; L. 1. 84-85 13. G. mento, Blgr., p. 106. 



2. Teeth conical ; depth of body 3-4 times in total length ; caudal peduncle 

 2-3 times as long as deep. 



a. 12 scales round caudal peduncle. 

 D. 28-32 ; A. 35-40 ; L. 1. 70-85 ; pectoral 



extending beyond root of ventral . . 14. G. Stanley anus, Blgr., p. 107. 

 D. 25-28 ; A. 30-36 ; L. 1.68-72; pectoral 



not extending beyond root of ventral . 15. G. senegalensis, Stdr., p. 108. 

 D. 24-26 ; A. 29-33 ; L. 1. 56-60; mental 



swelling feeble 16. G- angolensis, Blgr., p. 109. 



b. 14-16 (rarely 12 or 18) scales round caudal peduncle. 



D. 25-30 ; A. o0-37 ; L. 1. 70-86 . . .17. G. cyprinoides, L., p. 110. 



D. 23-25 ; A. 28-32 ; L. 1. 50-69 . . .18. G.macrolepidotus, Peters, p. 112. 



B. Dorsal and anal originating in the same vertical, 31-33 ; depth of body 



about 'A\ times in total length. 

 L 1. 78 ; caudal peduncle 3 times as long as 



deep, 12 scales round it 19. G. pictus, Marcus., p. 1 13. 



L. 1. 85 ; caudal peduncle 4 times as long as 



deep, 14 scales round it 20. G. gilli, Blgr., p. 114. 



C. Dorsal originating in advance of anal ; depth of body 3{-3? times in total 



length. 

 1. D. 28-29; A. 27-30. 

 L. 1. 42-43.; caudal peduncle 4 times as 



long as deep, 8 scales round it . . . 21. G. kutuensis, Blgr., p. 115. 

 L. 1. 55 ; caudal peduncle twice as long as 



deep, 12 scales round it 22. G. vssheri, Gthr., p. 116. 



