OF DENISON UNIVERSITY 
^35 
genus Pleiirodictyum Nicholson’s work, Pal. Tabulate Corals should 
be examined. The Australian fossils here described are part of a 
series kir\dly forwarded to us by Mr. John Mitchell of Bowning. 
They have all been obtained in the district near Bowning, New South 
Wales, Australia. The fossiliferous rocks here are all referred to the 
Upper Silurian Group. They form a great synclinal basin from east 
to west. Near the base of the exposed series is a bed of hardened 
greyish-grown shale about 50 feet thick. This has furnished the 
tribolites the first two species of Cyathophyllum and the Pleiirodictyum. 
Beneath this bed of shale is a layer of limestone containing many 
corals. From this we obtained Cyathophyllum Boloniense and the 
Endophyllum. The tribolites are all characteristic Silurian types. 
The corals have their nearest analogues in the Devonian formations. 
We find associated with the tribolites also two species of Pinnatapora 
or Glanconome, Goldfuss. Species of this genus usually occur in car- 
boniferous and sub-carboniferous strata, and are not known to descend 
below the Devonian series elsewhere. It is evident from these 
remarks that a careful study of the fossils of this district would be an 
unusually valuable contribution to the study of paleontology. 
.. S' 
CARBONIFEROUS. 
Chainodictyum laxum, Foerste. 
Siuce the first publication of this species we have obtained good 
casts of the porifous face. This shows that the cell orifices are elon • 
gated and are arranged in oblique rows across the branches ; their 
partition walls appear at the surface as more or less wavy, usually in 
osculating striae. Two or three cells occupy the width of a branch. 
McCoy in Carb. Foss. Ireland, published Retepora undata with 
the following description : “Irregularly cup-shaped, interstices anas- 
tomosing, flattened ; fenestrule ovate, pointed at one end ; poriferous 
face with five or six rows of pores in quincunx ; reverse with waved 
or scale like, semicircular ridges. This species we have seen Irom 
Kildare and identify with our genus. The lunate cross -strialions on 
the reverse side are also conspicuous. The cell apertures are sim- 
ilarly elongated and bordered by raised ridges. Compared with our 
species however the branches are much coarser and broader ; being 
