744 ON SOME AUSTRALIAN ELEOTRIN^, 



(k'scrilips tlie liead as lieing scaly, which is misleading, as the 

 greater part of the cheeks, the interorbital region, and the snout 

 are naked. 



Two years subsequently Dr. Franz Steindachner, in his descrip- 

 tion of Kleotris richardsonii, gives the number of rays in the first 

 dorsal as seven in the letterpress, while in the excellent figure 

 (unnamed and unnumbered) six are correctly shown; there is no 

 other material difference between Steindachner's description and 

 mine except in the comparative measurements of the interorbital 

 region, the width of which according to him is greater than the 

 diameter of the eye, while a reference to the above diagnosis will 

 show that I make it much less at all ages; this, however, may 

 possibly be explained by a difference in the system of measure- 

 ment employed, the width in my descriptions always being that 

 of the bony space only. 



Finally Sir William IVIacleay, in diagnosing Eleotris mantersii, 

 again falls into the same error, giving seven as the number of 

 spinous dorsal rays; of the fi-ve examples labelled as above, now 

 in the University Museum and undoubtedly the vei-y ones from 

 which Macleay took his description, not a single one has more 

 than six ra3^s. Rope's Creek, whence the types of E. mastersii 

 were Ijrought, is one of the original localities from which E. coxii 

 came. 



From the shape of the genital papilla, as given by the three 

 authors referred to above, it is evident that their descriptions 

 were taken in every case from female examples. 



Cox's Gudgeon is very generally distributed throughout the 

 entire netwoi'k of streams and ponds connected with the Upper 

 Hawkeslnuy, and wherever found appears to be abundant. 

 Hitherto I have failed to find it east of the range which divides 

 the Nepean and Wollondilly from the Parramatta and George's 

 Rivers, and am, therefore, sceptical as to its occurrence in the 

 IJronte Lagunes as asserted by Krefft; as far as ni}' experience 

 goes, this species is confined to the upper waters of the Hawkes- 

 bury, where it replaces Krpff'diis australis, which is the prevail- 

 ing species along the littoral zone, the ran<i,e of the two forms 



