BY J. DOUGLAS OGILBY. 165 



In addition to the type specimen, I have been able to examine 

 four others, three of which are in the Australian Museum and 

 were obtained from Port Jackson (2) and Port Stephens, while 

 the fourth was kindly lent me by Mr. A. Finckh, of the Techno- 

 logical Museum. 



CH EILODIPTERID^. 



Apogon ruppellii. 



Apogon rup^fellii, Giinther, Catal. Fish. i. p. 236, 1859; Port 

 Darwin. 



D. vii, i 9. A. ii 9-10. Sc. 2/25-26/6. 



Depth of body 2i to 2|, length of head 2| to 2f in the total 

 length. Dorsal profile strongly, abdominal moderately arched; 

 upper profile of head slightly rounded. Snout i to f of the 

 diameter of the eye, which is 2|- to 3 in the length of the head. 

 Interorbital region flat, its width 3^ to 3§ in the head. Maxillary 

 concave posteriorly, extending to the vertical from the middle of 

 the eye, its length ^ of that of the head, its width at the distal 

 extremity 2i to 2i in the diameter of the eye. Outer edge of 

 preopercle serrated, most strongly at the broadly rounded angle; 

 inner ridge with a few serr£e at the angle. Cheek with a single 

 series of tube-bearing scales. Gill-rakers 4-F 1:^, the longest h of 

 the eye. Dorsal fin originating above the base of the pectoral, 

 its distance from the tip of the snout 4 to ^ of that from the base 

 of the caudal; third and fourth spines equal or the fourth a little 

 the longer, § to 4 of the head and ^ to I of the longest soft rays; 

 spine of second doi"sal as long as or a little shorter than that of 

 first; length of second dorsal 'i of its height and less than that of 

 the anal : second anal spine about as long as the fifth dorsal, f 

 to 4 of the rays, which are subequal to those of the dorsal : 

 ventrals pointed, 4 to 4 of the head, and reaching beyond the 

 origin of the anal : pectoral with 1 4 rays, reaching to the vertical 

 from the 13th or 14th scale of the lateral line, 4 to f of the 

 head : caudal rounded, 3|- in the total length ; least depth of 

 caudal peduncle | to 4 of its length and 2| to 2i in the depth of 



