BY W. MACLEAY, F.L.S. 329 



D. 10/15. A. 3/10. L. lat. 68. 

 The length, of the head is three times and two-thirds in the total 

 length, and equal to the height of the body, the diameter of the 

 eye is four and one-thii-d in the length of the head. Praeoperculum 

 with a few scarcely visible denticulations, slightly emarginate ; 

 operculum, rounded, as in Spams, with a shallow re-entering arc ; 

 superscapula entire. Caudal fin truncate ; the point of the pectoral 

 falls short of the anus. The fourth dorsal spine longest, the 

 second and third of the anal fin nearly equal. Coloration imif orm, 

 with a black spot at the root of the pectoral fin. 



North-west Coast. 



59. Mesopeion Waigiensis, Quoy & Gaim. 



Gunth. Cat. I., p. 191. 



D. 10/14. A. 3/9. L. lat. 75. 



Height of the body three times and two-thirds in the total 

 length, and equal to the length of the head, the diaDieter of the 

 eye is four times and two-thirds in the latter. Pr^eoperculum 

 very finely serrated, notch conspicuous, knob rather indistinct. 

 Caudal fin emarginate ; pectoral distant from anal fin ; the third 

 and fourth dorsal spines longest ; the second of the anal stronger 

 but not longer than the third. Colour uniform olive (in a dried 

 state), with indistinct, oblique streaks above the lateral line, and 

 longitudinal ones beneath ; base of the pectoral with a narrow 

 black spot. 



Port Essington. 



60. Mesopeiox Johnii, B1. 



Gunth. Cat. I., p. 200. Bleek. Atl. Ichth. Perc. tab. 6o, fig. 3. 



Mesoprion unimaculatus, Cuv. & Yal., Eichards, &c. 



D. 10/14. A. 3/8. L. lat. 48. 



Height of body three times and a-half in the length, and nearly 



equal to the length of the head. Notch of praioperculum, and 



