MASTACEMBELUS. 1 1 3 



B. 23 or 24 dorsal spines ; prajopercular spines present. 

 D. XXIII-XXIV 75 ; A. II 75-80; a pra3- 



orbital spine ; length of head twice in its 



distance from vent 3. J/, march'd, Saiiv., p. 116. 



D. XXIV 100; A. II 100; no praaorbital 



spine ; lengtli of head 3^ times in its 



distance from vent 4. j1/. «7/^?^((fa;(f/(((.s, Gthr., p. 117. 



C. 25 to 34 dorsal spines ; prajoperenlar spines present. 

 1. Two anal spines. 



a. A strong praeorbital spine; length of head 2^ to 2| times in its 

 distance from vent. 

 I). XXVI-XXVII 85-90 ; A. II 80-1)0 . . 5. .1/. sdateri, Blgr., p. 118. 

 D. XXVII-XXIX 9.5-105 ; A. II 11.5-125 . ti. M. rwudngtoni, Blgr.. p. 119. 



h. A small |ira?orl>ital spine ; length of head 2^ to 3^ times in its distance 

 from vent. 

 D. XXVI-XXX 80 ; A. II 80 ; depth of 



bodv 12 to 13 times in total lengtli . . 7. M. liheriensis, Blgr., p. 119. 

 D. XXVIII-XXXII 100-130; A. II 100- 

 130 ; dei)th of body 13-17 times in total 

 lenoth 8. M. loennhergii^'SAgv.,-^. -120. 



c. Xo praeorbital spine; length of head 3 to 4^ times in its distance from 

 vent. 

 D. XXIX-XXXII 80-85 ; A. II 80-85 . . 9. M <7<;to, Blgr., p. 121. 

 D. XXXIV 128; A. II 120 10. J/. ««*(?;•(/«, Blgr., p. 122. 



3. Three anal spines; a strong i)ra3orbital spine. 

 IJ. XXV-XXVni 85-90 ; A. Ill 85-92 . , 11. M. congicus, Blgr., p. 123. 

 D. XXIX 85 ; A. Ill 85 12. M. nignatus, Blgr., p. 124. 



D. 25 to 35 dorsal spines; no prajorbital or prajopercular spines. 



1. Head i to 1^ times as long as its distance from first dorsal spine. 

 I) XXVII 80-90 ; A. II 68-80 ; no lateral 



line 13. M. niger, Sauv., p. 125. 



D XXV-XXVIII 70-80; A. II 80-90; 



lateral line formed of a few tubules widely [p. 125. 



separated from one another 14. M.Jiavomarginafus, TMgr., 



1). XXX-XXXIII 80-90 ; A. II 80-90 ; 



lateral line formed of a few tubules widely 



separated from one another 15. M. hatesii, Blgr., p. 126. 



2. Head 2 to 3 times as long as its distance from first dorsal spine. 

 a. 2.5-29 dorsal spines. 



D. XXV-XXVIl 70-80 ; A. II 70-80 ; 

 mouth extending to below centre of eye ; 

 30-35 scales between origin of soft dorsal 



and lateral line IG. .1/. moorii, Blgr., p. 127. 



VOL. IV. I 



