OCCURRENCE OF A SUBMERGED FOREST. 169 
parva, Petit; Ostrea Angasi, Sowerby ; Ostrea cucullata; Nucula 
Strangei, A. Adams; Cryptodon globosum, Forskal; Cardium 
tenuicostatum, Lam.; Mytilus hirsutus, Lam.; Potamides eben- 
inus, Bruguiere; Lampania australis, Quoy; Natica Strangei, 
Reeve; Natica plumbea, Lam.; Natica conica, Lam.; Bulla aus- 
tralis, Quoy & Gaimard; Bittiwm granariuwm, Kiener; Nassa 
jonasi, Dunker; Calliostoma decorata, Philippi; T'rochocochlea 
zebra, Wood ; Liotia clathrata, Reeve; Risella lutea, Q. & Gaim.; 
Urosalpinz Hanleyi, Angas; Triton olearium, Linn. 
The mollusea do not call for any special mention, they are a 
mixture of both muddy-inlet and sandy-beach loving forms, such 
as one would expect to find in a deposit that must have under- 
gone alterations of deposition. The Echinoderm is a deep water 
Species, and in all probability was simply washed in. 
Much interest attaches to the borings of the Oyster-boring 
Worm Polydora. In 1890, Mr. T. Whitelegge, of the Australian 
Museum, was deputed to investigate a disease that appeared 
amongst the oysters of New South Wales, on behalf of the Fishery 
Commissioners. It appears from his researches' that a marine 
worm, determined as above by Prof. W. A. Haswell, bores into 
and infests the shells of the oysters. The death of the oyster is 
then brought about by the decomposition of the mud after the 
death of the worms. At the time these investigations were made 
it was supposed by the oyster farmers and others to be a new 
disease, at any rate, so far as New South Wales was concerned, — 
but we now find evidence of its existence at the remote period to 
which the deposition of bed (e) is to be referred. A few stumps 
of trees were also noticed enclosed in this bed. (Stumps Nos. 4 
and 6 on longitudinal section Plate 9). ‘ 
No. 4 Stump was a very large one, much eaten by boring on 
the outside, the borings, however, extending but a very short 
distance into the wood. This appeared to be in situ, the level of 
the top of the roots being three feet four inches below low water 
1 Aust. Mus. Records, 1890, 1., No. 2, p. 41. 
