38 



MEMOIRS OF THE QUEENSLAND MUSEUM. 



complete this report. The following key separates the Clupeoid scales now 



described : — 



No radii ; apical margin entire 



Radii present 



Basal field with vertical radii 



Basal field -without vertical radii 



2. Apical field with distinct transverse or V-like radii 

 Apical field without such radii 



3. Transverse radii, except the uppermost regularly interrupted 



Transverse radii not or rarely interrupted 



4. Transverse radii 3 or 4, rarely fewer 

 Transverse radii more numerous . . 



5. Apical margin coarsely crenulate 

 Apical margin not crenulate 



6. Apical margin with long strap-like teeth 

 Apical margin without teeth 



Chirocentrus dorab. 



1. 



2. 



3. 

 . Engraulis antipodum. 



Potamalosa novce-liollandice. 

 in middle 



Amblyg aster neopilchardus- 



4. 



5. 



6. 



Stoleplwrus robiistus. 



Harengula castelnaui. 



Sardinella moluccensis. 

 , Dorosoma come. 



ATHERINID^E. 

 Rhadinocentrus ornatus Regan. Queensland; Moreton Bay. Scales 

 transversely oval or oblong, about 2-J mm. broad and 1^ long; completely 

 cycloid; corners rounded, the laterobasal slightly angular; circuli fine, all 

 round scale; basal radii numerous (about 12). The scales resemble those of 

 the Pceeiliidae. Those studied are latinucleate, with a large sculptureless 

 nuclear field. 



Rhombatractus fitzroiensis Castelnau. Queensland; Brisbane, fresh 

 water. Scales about 1\ mm. broad and If long; completely cycloid; latero- 

 basal corners rectangular; nuclear region a short distance above the middle; 

 about ten basal radii ; circuli fine and regular, except in the apical field, where 

 they are mainly broken into small pustulif orm markings ; slight suggestions of 

 apical radii on some scales. 



R. maccullochi Ogilby. Queensland. Scales almost exactly as in the 

 other species, except that the circuli are practically absent in the apical field, 

 not represented by pustuliform markings. 



These scales resemble those of Menidia menidia, except that they are much, 

 smaller, the laterobasal angles are more distinct, and the lateral circuli are much 

 denser. 



MUQILID2E. 



Mugil cephalus dobula Giinther. Queensland. Scales subquadrate, 

 about 10 mm. broad and 11 long; basal radii about 8 to 12, subparallel, not 

 crowded about middle of scale; laterobasal corners evident; ctenoid area very 

 well developed, the elements contiguous throughout; region above the nucleus 

 covered with fine labyrinthiform markings. The basal circuli are extremely 

 fine and dense ; much more so than in M. curema. The shape of the scales is 

 entirely different from that of M. curema. 



