660 Proceedings of the Royal Society 
R. ornatus occurs in the Calciferous Sandstone series of Scotland, 
as at Burdiehouse in Mid-Lothian, and Pittenweem in Fifeshire ; but 
it is especially abundant in the blackband ironstone of the Lower Car- 
boniferous Limestone group at Gilmerton, above which horizon it has 
not yet been discovered. 
2. On the Anatomy of a recent species of Polyodon, the 
Polyodon gladius (Martens), taken from the river Yang- 
tsze-Kiang, 450 miles above Woosung. Part III., being 
its Viscera of Organic Life. By P. D. Handyside, M.D. 
The author proceeded with his anatomical description of the 
respiratory, circulatory, and pneumatic systems in this remarkable 
hsh ; referring to the differences that exist in the male, the female, 
the young, and the adult specimens. He also shortly noticed the 
alimentary and other viscera of Organic life. 
Dr Handyside illustrated his paper by 24 additional drawings 
— including 7 microscopic views — of structure in this fish. 
The fourth and last part of Dr Handy side’s paper will consist of 
a description of the articular system and the endo-skeleton of the 
Polyodon gladius. 
3. A Mechanical Illustration of the Vibrations of a Triad of 
Columnar Vortices. By Sir William Thomson. 
4. Fourth Report of Boulder Committee, with Remarks. 
By D. Milne Home, Esq. 
Since the last Report was drawn out and laid before the Society, 
the Convener has had an opportunity of inspecting a considerable 
number of boulders not mentioned in previous Reports. Some 
of these are interesting, on account not only of size, but also of 
shape, marks on them, and position. The Committee consider 
that advantage will result from a special description of these, 
and from woodcuts of a few. 
The cases have been arranged, as in previous Reports, according 
to counties, to indicate the geographical position of the boulders, 
and enable persons desirous of inspecting them, to know where to 
find them. 
