BY W. MACLEAY, P.L.S. 549 



The helglit of the body is t\TO and a-half times in the total 

 length. Fins black or dusky ; caudal whitish. From one to two 

 inches in length. 



Tort Jackson (Gunther). 



Genus Equula, Cuv. & Val. 



Body more or less compressed, elevated or oblong, covered with 

 small deciduous cycloid scales. Mouth very protractile. Minute 

 teeth in the jaws, none on the palate. One dorsal fin. Five 

 branchiostegals ; pseudobrancliiee ; air-bladder large, terminating 

 in two short horns. 



Indian and Australian Seas. 



384. Equula edextula, B1. 



Gunth. Cat. Fishes II., p. 498. 



Equula serrulifera, Eichards, Yoy. Erebus and Terror, Ichth., p. 

 137, pi. 59, fig. 12-14. 



B. 5. D. 8/15-16." A. 3/14. Cecc. pylor. 2. 



Height of body twice or twice and a-c[uarter in the total length, 

 the length of the head from four times to four and a-third ; the 

 upper profile is angular. A pair of small spines above the anterior 

 margin of the orbit ; the cavity on the head is quadrangular, 

 much broader anteriorly than posteriorly, its width between the 

 spines being once and two-thirds in its length. The lower pree- 

 opercular margin is serrated, and its length is one and two-fifths 

 that of the mandibula, which is very concave and ascends at an 

 angle of about 45°. The second dorsal spine is three quarters 

 the length of the head. Scales very small, but conspicuous. 

 Spinous dorsal without black ; base of the pectoral brownish. 



Coasts of Australia (Eichardson) ; Endeavour Eiver (Macl. 

 Museum). 



