Extract

In the summer of last year, while paying a visit to one of my old favourite localities for Carboniferous fossils, viz., Craigenglen, on the South Hill of Campsie, I again renewed acquaintance with some blocks of a lacustrine limestone which lie scattered about on the hillside, or strewn along the bed of the burn. The position of this limestone is in the Lower Carboniferous marine limestone series of the district, and the blocks seem to have come from some of the mines on the hillside when the clay ironstone was being worked in the earlier part of the present century.

Many years ago, after noticing that this limestone contained numerous examples of the minute shells of Ostracoda, I collected specimens of the weathered rock, crushed them to powder, and washed them, by a process which I described to the Society.* The result was that I was able to collect and mount the four species of Ostracoda which I exhibit this evening. Since then I have obtained a fifth species from the same limestone. These species have been investigated and described by Prof. T. Rupert Jones and Mr. J. W. Kirkby, who found that four out of the five were new to science, and all of these were afterwards named and figured by them.†

At the time I first found these Ostracoda in the Campsie limestone I had not examined the rock in thin transparent sections under the microscope, but several of the specimens collected on my recent visit to Craigenglen

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