262 NOTES AND EXHIBITS. 



(Estuary Perch) are as follows: — (a) The far more elongate habit. 

 (6) The non-excavate character of the upper profile of the head 

 (which in P. colonorum is invariably concave — often highly so), 

 (c) The relatively greater general thickness as compared with 

 body-height, (d) The shorter head, (e) The much more ctenoid 

 character of certain body scales in all but older specimens. It 

 was also pointed out that the habits of P. fiuviatilis were different 

 from those of P. colonorxim. Mr. Stead stated that he considered 

 that none of the names now taken as synonyms of P. colonorum 

 were applicable to this form. Specimens of P. colonorum for 

 comparison with those of the new species were also exhibited. 



Mr. John Mitchell exhibited specimens of some fossil shells 

 which are either rare or have not been previously recorded from 

 this State. Gypidida galeata was collected at Hatton's Corner, 

 Yass River, and from the junction of Limestone Creek and 

 Jones Creek, Silverdale. A species of Nucula occurs in the 

 Upper Trilobite Bed of the Bowning Series, and was found at 

 Bowning, in the small creek that runs through the village, 

 associated with the trilobites, Odontopleura Battel and Phacops 

 Crossleii Eth. fil. and Mit. A Conocardium was collected from 

 the Lower Limestone Bed of the Bowning Series at Limestone 

 Creek, Silverdale. The specimen is small, not more than 

 half-an-inch along the hinge line. Associated with it were 

 Atrypa reticularis Linn., Sphwrexochus minis Beyr., etc. Two 

 valves of a specimen belonging to the genus Beyrichia were 

 taken from an impure limestone on the Glen William Road, 

 three miles from Clarence Town. The range of this genus in 

 Europe is Silurian to Carboniferous, and its occurrence in the 

 Clarence Town beds is interesting. In the same rocks were 

 fragments of Griffithidia or Phillipsia, Spirifers, Ariculopecten, 

 Orthothetes, Conocardium, etc. A Bronteus near to B. Jenkinsi 

 was collected near Molong. It was associated with species of 

 Athyris and Meristella, apparently identical with those with 

 which B. Jenkinsi occurs in the Hume Beds and Bowning Series. 

 From the same limestone, near to the hospital, were collected 



