MASTACE.M BELUS. 1 1 3 



S 



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



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

 orbital spine ; length of head twice in its 

 distance from vent 3. M. marchii, Suuv., p. 116. 



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

 spine; length of head 3s times in its 

 distance from vent 4. M. cryptacanthus, Gfcbr.,p. 117. 



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

 1. Two anal spines. 



a. A strong prseorbital spine; length of head 2^ to 2f times in its 



distance from vent. 

 I). XXVI-XXVII 85-90 ; A. II 80-90 . . 5. M. sclat&i, Blgr., p. 118. 

 D. XXVII-XXIX 95-105 ; A. II 115-125 . 6. M. cunningtoni, Blgr.. p. 119. 



b. A small prseorbital spine ; length of head 2§ to 3 j times in its distance 



from vent. 

 I). XXVI-XXX 80; A. II 80; depth of 



body 12 to 13 times in total length . . 7. M. liberiensis, Blgr., p. 119. 

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



130 ; depth of body 13-17 times in total 



length 8. M. loennbergii, Blgr., p. 120. 



c. No praaorbital spine ; length of head 3 to 4| times in its distance from 



vent. 

 D. XXIX-XXXII 80-85 ; A. II 80-85 . . 9. M. g<»v, Blgr., p. 121. 



D. XXXIV 128; A. II 120 10. M. ansoryii, Blgr., p. 122. 



3. Three anal spines; a strong prseorbital spine. 

 I). XXV-XXVIII 85-90 ; A. Ill 85-92 . . 11. M. congicus, Blgr., p. 123. 

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



D. 25 to 35 dorsal spines; no prseorbital or prseopercular spines. 



1. Head 4 to H times as long as its distance from first dorsal spine. 

 D XXVII 80-90 ; A. II 08-80 ; 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. flavomarginatus, Blgr., 



D. 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. 25-29 dorsal spines. 



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

 month extending to below centre of eye ; 

 ,30-35 scales between origin of soft dorsal 



and lateral line 16. M. moorii, Blgr., p. 127. 



VOL,. IV. I 



