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 \ inches or so in length. The 

 crest extends for nearly 5 inches, from behind the occiput 

 to about lj- 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, 1862, 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, 1S64. 



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- 



