230 Proceedings of the Royal Physical Society. 
are a few short spines which cannot be easily counted, form- 
ing a low ridge, which gradually diminishes towards the 
rounded extremity and point of the tail. 
In the second, the last of the caudal spines numbered 
diminish towards the rounded extremity of the tapering 
tail, which measures about 2 J inches or so in length. The 
crest extends for nearly 5 inches, from behind the occiput 
to about IJ- inch beyond the anal opening. I have the 
pleasure of presenting the specimens to our Museum of 
Science and Art, which has none of this rare chameleon. 
Wednesday^ February 22, 1865. — David Page, Esq., President, 
in the Chair. 
The following Donations to the Library were laid on the table, and 
thanks were voted to the Donors : — 
1. (1) Transactions of the Zoological Society of London. Vol. v. 
Parts 1 and 2, 1862-63; (2) Proceedings of the Zoological Society of 
London, 1S62, Parts 1, 2, and 3, January-December — From the 
Society. 2. Transactions of the Botanical Society of Edinburgh. Vol. 
viii. Part 1, 1864. 3, Transactions of the Royal Scottish Society of 
Arts. Vol. vi. Part 4, 1864. 
The following Communications were read : — 
I. Notes on the Crustacean genus Stylonurus ; from the Lower Old 
Red Sandstone of Forfarshire. By David Page, Esq. (Plate III.) 
Mr Page gave a brief description of the genus Stylonurus; 
alluding more especially to a new and gigantic species that 
had been recently discovered in the flagstones or lower Old 
Eed Sandstone of Forfarshire. He had established the 
genus in 1855, from a specimen obtained from the Forfar 
flagstones by Mr Powrie of Eeswallie, to whom the Society 
owed the exhibition of the beautiful casts now on the table. 
The genus he had named from the pointed style-like tail- 
plate, which at first sight formed the most obvious dis- 
tinction between it and the allied genera Eurypterus and 
Pterygotus, The whole belonged to the fossil family Euryp- 
