PERMO-CARBONIFEROUS FENESTELLIDA. 183 
So the micro-photographs were made by reflected light, 
and even focus over the field was obtained by fitting a 
diaphragm of zine with a pin-hole aperture, between the 
two lenses of the objective in the microscope. 
The material here described mostly comes from Branxton, 
with a few specimens from Allandale, both localities in 
the Hunter River district, also for comparison, one speci- 
men of Protoretepora ampla Lonsdale, from Bundanoon. 
The Branxton specimens come from the railway cutting 
immediately to the west of Branxton Station, being found 
in that series of Polyzoal shales known as the Branxton 
Beds, which lie just above the basal sandstones and con- 
glomerates of the Upper Marine Series. The Allandale 
specimens on the other hand are ina hard calcareous shale 
or sandstone from a railway cutting east of. Allandale 
Station. This with associated conglomerates occurs about 
the centre of what Professor David! calls the Lochinvar 
Stage, at the base of the Lower Marine Series. 
So far ten forms have been separated from the material 
available, but I am satisfied that others exist in these 
localities, at least another Fenestella, and probably another 
Polypora, but as yet there is insufficient material at hand to 
be sure. Following is the description of the species:— 
Class POLYZOA. 
Order GYMNOLAIMATA Allman. 
Sub-Order CRYPTOSTOMATA Vine. 
Family FENESTELLIDA King. 
Genus PROTORETEPORA de Koninck.? 
Much doubt has hitherto existed as to the identity of 
this genus, and its relations to Polypora McCoy. One of 
the features made much of by de Koninck,? and afterwards 
1 Prof. T. W. E. David, (14) p: 47. 
* de Koninck, (6) p. 138. 
