61 



the caudal is of the latter colour ; anal dark, with the rays purple ; 

 ventrals white, with the rays rosy ; pectorals yellow at the base, 

 and black on their interior half. Average length, 11 inches, but 

 some are much larger. 



HTTRRAYIA. 



This new genus comes between Dales and Therapon. 



The dorsal has eleven spines ; the operculum is denticulated 

 in all its length ; there is a line of small teeth on the palatines, 

 and the caudal is rounded. Scales minutely serrated; head 

 cavernous. 



These fish inhabit the rivers of Eiverina, and particularly the 

 Murray, and are brought to the Melbourne market by the Echuca 

 Eailway. They are all considered good for the table, and are 

 generally sold under the name of Murray Perch. 



This genus must be very nearly allied to Macquaria, but the 

 latter has no teeth in the jaws. I expect that the Dules Viver- 

 rinus, Krefft, " Proceedings Zoological Society, 1867," which I 

 have not seen, belongs to this genus, as it has eleven spines at 

 the dorsal ; it also comes from the Murray. 



MTTBEAYIA GTJNTHEEI. 



D 11/12. A. f. P. 16. C. 16. L. lat. 50 (and 5 on the 

 Caudal). L. tr. 101/181. 



Height three and one-half times in length ; head three and 

 two-thirds in same ; eye four and one-half in the length of the head. 

 Upper profile very convex, the back being very much elevated 

 behind the head, and almost gibbous ; lower profile much more 

 regularly curved ; upper surface of the head naked ; the other 

 parts covered with scales. Pra^orbital very finely denticulated ; 

 prseoperculum with its posterior margin rather emarginated, and 

 finely serrated ; at its rounded part, these denticulations become 

 much larger, and extend so on all the inferior margin. They 

 present several small spaces devoid of them— one before the 

 angle, one below it, and a few others on the lower edge. Oper- 

 culum terminated by two very broad, flat, oblique appendices 

 these are strongly serrated, and the space between them is very 

 small; all the posterior margin is finely serrated; the super- 

 scapula and the caracoid are also serrated. The lateral line is 



