20 
not the case; it was upon observations of the marginal cells that the “ circular i} 
theory” was grounded, and for their form, as well as for the hexagonal form of the 
surrounded cells, the circular theory accounted, whereas the intentional theory of 
Mr. Smith applied to the central cells only, and left the other case entirely un- 
explained. At any rate the two theories were before the Society, and he hoped the 
two papers would be published together, so that Members, caring naught for either | 
theory as such, might impartially draw their conclusions for themselves. 
New Part of the ‘ Transactions. 
A new Part of the ‘ Transactions,’ Series 3, Vol. i. Part 9, being the concluding 
part of the volume, and the first published during the present year, was on the table. 
May 2, 1864. 
F. P, Pascoer, Esq., President, in the chair. 
Donations to the Library. 
The following donations were announced, and thanks voted to the donors :— 
‘Mémoires de la Société de Physique et d’Histoire Naturelle de Genéve, Vol. xvi. 
Parts 1 and 2; Vol. xvii. Part 1; presented by the Society. ‘ Proceedings of the 
Royal Society, Vol. xiii. No. 61; by the Society. ‘Journal of the Proceedings of the 
Linnean Society,’ Vol. vii. No. 28; by the Society. ‘Notes on Spherularia Bombi, 
by John Lubbock, Esq., F.R.S., Pres. Ethn. Soc.; by the Author. ‘ Sitzungsberichte 
der Konigl. bayer. Akademie der Wissenschaften zu Munchen, 1863, II. Heft iv. ; 
by the Academy.’ ‘The Journal of Entomology, No. 8; by the Proprietors. ‘The 
Journal of the Society of Arts’ for April; by the Society. ‘The Reader’ for April; 
by the Editor. ‘The Zoologist’ for May; by the Editor. ‘Stettiner Entomologische 
Zeitung, 1864, Nus. 4—6; by the Society. ‘ Descriptions of New Geuera and Species 
of Phytophaga, by J. S. Baly; by the Author. 
Exhibitions, &c. 
Mr. Dunning (on behalf of Mr. R. 8S. Scholfield, who was present as a visitor) 
exhibited a specimen of Hydrilla palustris, captured by Mr. Scholfield in Quy Fen, 
Cambridgeshire; the specimen was a male, and was disturbed from grass on the after- 
noon of the 29th of May, 1862. This Noctua was introduced into the British List on 
the authority of an example in the possession of Mr. Allis, taken some years ago near 
York; but the species was not included (or rather was given as a ‘ Reputed British 
Species”) in Mr. Doubleday’s ‘Synonymie List of British Lepidoptera’ (ed. 1859). 
Captain Cox exhibited various coloured drawings of Lepidopterous larve ; and the 
original of his “ larva-index” or “ larva-dictionary,’ the plan of which was described 
by him at a recent Meeting of the Society. (See ‘Journal of Proceedings’ for 1863, 
p. 186.) 
Captain Cox also exhibited a number of Lepidopterous larve which had taken 
possession and were consuming the contents of a large bin of bran; in the previous 
year he had found Aglossa pinguinalis extremely abundant in his stables and out- 
houses, and hence thought it probable that the larve were of that species; it was, 
