90 NEW GENERA AND SPECIES OP AUSTRALIAN PISHES, 



the longest, 2f in the length of the head : the anal fin commences 

 beneath the origin of the second quarter of the dorsal and is in 

 all respects similar to that fin; the space between its origin and 

 the extremity of the mandible is 1|^ in its distance, from the base 

 of the caudal fin : ventral inserted but little in advance of the 

 free margin of the opercle, as long as, the pectoral two-thirds of 

 the length of the head : caudal fin with rounded base and four, 

 teen rays. 



Pale yellowish-brown, with the fins lighter. 



The unique specimen was picked up on the beach at Maroubra 

 by Mr. Whitelegge; it was dead, but quite fresh, and in a perfect 

 condition, but for the loss of about half of the caudal fin ; a 

 portion of the anal, consisting of from fifteen to eighteen rays, 

 and commencing at the tenth ray, is also missing. 



Length 55 millimeters. 



Type in the Australian Museum, Sydney ; register number 

 I. 3654. 



Monotlirix poJijlepis agrees fairly well with Mr. Alcock's 

 Dinematichthys piger (Ann. Sf Mag. Nat. Hist. (6) vi. 1890, 

 p. 432), from which, however, it may at once be distinguished by 

 its much smaller scales and more numerous dorsal and anal rays; 

 possibly also by the shape of the maxillary. 



The character of the dentition and the uniradial ventrals 

 separate these two species from Dinematichthys and its allies. 



AusTROPHYCis, gen.nov. 



Body moderately elongate and strongly compressed throughout. 

 Head rather large and tumid, with short rounded snout; mouth 

 anterior, with wide oblique cleft; lower jaw included; chin with 

 a barbel. Premaxillaries slightly protractile, forming the entire 

 dentigerous portion of the upper jaw; maxillary narrow, its distal 

 extremity exposed and but little expanded. Upper jaw with a 

 narrow band of small cardiform teeth, the two outer series enlarged 

 and separated from the inner portion, which is triserial, by a 

 distinct interspace; lower jaw with three series of teeth similar 

 to the outer premaxillary ones; vomer, palatines, pterygoids, and 



