258 Proceedings of the 



transparency of its polyps, arising from the extreme vacua- 

 lation of their tissues. When at rest the polyps extend their 

 bodies and tentacles to their utmost length ; but a sudden glare 

 of light, or shaking of the vessel in which they are confined, 

 causes the modest hair polyp to contract itself, or to bend the 

 buccal cavity and tentacles loosely downwards, like a flower 

 drooping on its stalk. It seldom entirely withdraws itself into 

 its cell unless irritated. 



I have never observed any reproductive apparatus or 

 acaleph-bearing capsules on this zoophyte ; and, in default of 

 their appearance, I am disposed to class it with the Corynida? 

 of Johnston ; and that on account of the progressive develop- 

 ment of the tentacles, which, as in Coryne, Clava, and Hydrac- 

 tinia, become more numerous with the increasing age of the 

 polyp, while in the Campanulariadse, to which I at first referred 

 it, under the name of C. trichoides, the growing polyp has its 

 full complement of tentacles when it issues from its opening 

 cell. The polyps of Trichydra also differ from those of the 

 Campanulariadse and Sertulariadse generally, in showing no 

 disposition to hold the tentacles in a double row ; an arrange- 

 ment of these organs which has not been sufficiently noticed in 

 the figures and descriptions of authors on these classes. 



3. Tubularia indivisa will be described under next meeting (see page 

 263). 



4. Description of New Protozoa (see Appendix No. II.). 



Wednesday, 22d April 1857.' — W. H. Lowe, M.D., President, in the 



Chair. 



The following Communications were read : — 



I. Notes on Scottish Lepidoptera in 1855-56. By R. F. Logan, Esq. 



The communication I have to-night to lay before the Society is, as its 

 title imports, rather a collection of scattered notes, than a regular paper. 

 I shall first enumerate a few insects which were added, during the years 

 1855 and 1856, to the list of species occurring around Edinburgh ; prin- 

 cipally by the industry and energy of the Messrs Wilson. 



The first species on Mr Wilson's list is Anisopteryx jEscularia, of which 

 he obtained a single male specimen from Corstorphine Hill, in the spring 



