BY 'ALLAfJ R. MdCtJLEbCH. * 49' 



^ This genus differs from Atherind in having a smaller 

 mouth and shorter and fewer gill-rakers. From Toknio- 

 membras it is distinguished by the absence of vomerine' 

 teeth. 



Atherininichthys, Bleeker, in which C. maculatus and 

 other Australian atherines have been placed, is synonymous 

 with Chirostoma, Swainson* (type Atherina Tiumboldtiana 

 Cuv. & Val.), and differs from all the Australian species 

 in its small scales, long anal fin, and general form. 



Craterocephalus fluviatilis, s'p. nov. 



(Plate I..; Figure 1.) 



D.V-VII, 1/7-8; A.I/8-9; V.I/5 ; P. 12-13; C. 17; 

 L. Lat. 31-33. 



Head 3f-3| in the length from the snout to the hypural. 

 Depth IJ-IJ in the head. Eye longer than the snout, 

 about 3 in the head, and equal to or longer than the depth 

 of the caudal peduncle. Interorbital width a little narrower 

 than the eye in young specimens, wider in adults. Cheeks 

 with a single series of large angular scales, and there are 

 similar scales on all the opercular bones ; upper surface of 

 the head with larger irregular scales extending forwards 

 to between the eyes, snout and preorbital naked. Anterior 

 nostril near the margin of the preorbital on the angle formed 

 between the top and side of the snout ; posterior nostril 

 near the eye. A line of pores extends from the snout to 

 behind the eye, then bends downwards to a groove above 

 the operculum ; another line extends around the preoper- 

 culum and branches behind the angle of the mouth, one 

 branch running along the preorbital and the other on to 

 the lower jaw. Maxillary slightly expanded posteriorly 

 not reaching the anterior margin of the eye. Six branch- 

 iostegals. Teeth minute, in a single series in each jaw. 



Scales large, cycloid, concentrically striated, 31-33 

 in a row from behind the base of the pectoral to the hypural. 

 Most of those on the dark lateral band are pierced by a 

 simple pore. Between the median scale before the second 

 dorsal and that in front of the anal there are 7-10 rows ; 

 in 20 specimens from the junction of the Namoi and Barwon 



''See Jordan & Evermann, Bull. U. S. Nat. Mus., No. 47, Pt. I., 

 1896, p. 792, and Pt. IV., 1900, pi. cxxiii., fig. 334. 

 D 



