196 The Irish Naturalist. [August, 



willing helpers assisted him to collect the pairs of leaves 

 between whose fastened-together edges the larvae were to be 

 found. Almost the whole party eventually met at Clogh 

 Oughter Castle, or Bedell's Tower, a mile to the north- 

 ward — a massive circular keep, one-half of it now fallen 

 down, standing on an islet in the centre of one of the 

 reaches of the lake. The return to Killykeen was 

 made in time to allow a half-hour's hunt over the 

 bog at Derrywinny, where, on a preliminary visit to 

 Cavan in May, I had noted several uncommon plants. These 

 were all found, and some additional .species of interest. The 

 flora of the bog includes the Great Sundew {Drosera anglica). 

 Marsh Andromeda {A. polifolid), three species of Bladderwort 

 ( U. vulgaris, U. intermedia, U. mifior), the Frog-bit {Hydro- 

 charis Morsus-rauce), White Beak-rush {Rhynehospora alba)^ 

 Cyperus S^dg^{Carex Pseudo-cyperus), and Spinulose Buckler- 

 fern {Lastrea spiiiulosa). A drive along beautifully wooded 

 roads brought us back to Cavan. In the evening the tables 

 were cleared, and bottles, jars, collecting boxes, and dr3dng 

 paper took the place of knives and plates, and we had an 

 exhibition and examination of the specimens collected on our 

 first two days. Prof. Cole, Miss Thompson, and A. G. Wilson 

 showed the rock-specimens obtained in the CroSvSdoney dis- 

 trict. W. F. de V. Kane, Hon. R. E. Dillon, and Kndymion 

 Porter produced their entomological finds. H. Lyster Jameson 

 had two species of bats, and the rare shell Clausilia lafuinala. 

 W. D. Donnan and I had some flowering plants ; and others 

 contributed according to their means. By request, the Dublin 

 President (Prof Cole) gave a brief general sketch of the 

 geological construction and history of the district. He said 

 that the geology of the vicinity afforded some contrasts, 

 beneath the uniform scenery of rounded hills and intervening 

 little lakes, which are such a feature of Co. Cavan. The floor 

 of the country is formed of Ordovician shales and sandstones, 

 finely seen upon Slieve Glah, and uptilted, as usual, by earth 

 movements prior to the Carboniferous period. At Crossdoney, 

 a biotite-granite, with associated veins of compact grey eurite, 

 penetrates the Ordovician beds, probably as an accompaniment 

 of these same movements. The alteration of the Ordovician 

 shales along the junction had been well seen in several sections. 

 To visitors from Dublin, the comparison with the muscovite- 



