Journal of Proceedings. 
lxxxvii 
aberration of Lyccena arion (the “ Large-blue ” butterfly), the underside 
of which corresponded with that figured by Newman in his ‘ British 
Butterflies’ from Mr. Bond’s collection. The upper side had a silvery 
“ sheen,” and differed somewhat from the usual type in other respects. 
He also exhibited a “preserved ” larva of an Eupithecia mounted on 
heath, as a reproduction of the specimen found by Mr. Bobarts in 
Epping Forest [ ante , p. Ixxviii.], and which he thought was E. nanata. 
He wished to ask if it were generally known that the species occurred 
in the Forest, as both Stainton and Newman spoke of it as a North 
British species, although the latter added that it had been taken in 
Suffolk. 
Mr. W. Cole remarked that E. nanata was a common species on 
Shirley Heath, Surrey, where he had often “ swept up ” the larva in the 
early summer, and his brother, Mr. B. G. Cole, had taken the imago in 
Epping Forest in 1878, the specimen being in their cabinet. He thought 
the moth was by no means a northern species, and that it occurred 
wherever its food plant, the Common Ling ( Calluna ), grew abundantly. 
Mr. N. F. Bobarts, F.G.S., read a paper entitled “ Notes on the 
London Clay and Bagshot Beds at ‘ Oakhill Quarry,’ Epping Forest.” 
[Trans., vol. iii.] The author observed that no apology was necessary 
in bringing the subject before the Club, one of whose aims certainly 
ought to be to describe local sections as they are exposed, and thus 
preserve a record of them for the use of geologists generally, even if no 
new facts were to be learned from their examination. The paper was 
illustrated by sectional diagrams and maps, and the following 
specimens:— 
London Clay, Sharks’ teeth, Theydon Mount. 
,, ,, Septaria, Brentwood Brick Pits. 
,, ,, Iron pyrites and decayed ditto, Oakhill Quarry. 
,, ,, Ironstone nodules, ,, ,, 
,, ,, Cast of shell in sandstone, ,, ,, 
,, ,, Cast of shell in iron pyrites, ,, ,, 
Bagshot Beds, Sand from altered Bagshot Pebble Beds, Oakhill Quarry. 
Professor Boulger, after thanking Mr. Bobarts for his paper, said he 
had been especially interested in the general observations with which it 
was introduced, with reference to Mr. Searles Wood’s theories. He was 
very reluctant to assume the existence of disturbances from mere surface 
features, as Mr. Searles Wood did. He should be much more inclined 
to adopt Mr. Bobarts’s suggestion that the steeper slope of the western 
sides of the elevations depended on the increased rainfall on the western 
sides, on account of the prevalent wind. 
A short discussion ensued, in which the President, Mr. Wire, the 
author, and others took part. 
The following paper by Mr. John Gibbs, of Chelmsford, was read by 
Professor Boulger, who lucidly explained the various points in it by viva 
voce expositions and by drawings on the black board ;—• 
