The Isle of Purbeck possesses numerous points of geological interest, and its coast scenery has been celebrated, in conjunction with that of Lulworth, by many writers and artists. The classical work of Sir Henry Englefield, assisted by Webster, in the early part of the last century, served to make known some of the most interesting features of the coast, such as are more or less obvious to all who venture to sail beneath its cliffs. Of late years the geology of the Isle of Purbeck has attracted the attention of the officers of the Geological Survey, and has come in for a considerable amount of description at the hands of H. B. Woodward, Aubrey Strahan, and Clement Reid, in their respective departments. The zones of the Chalk in this region have also been admirably described by Dr. Rowe and his coadjutors, mostly from coast sections.

There is only the one poorly preserved and imperfect specimen in the Woodwardian Museum on which Salter founded this species. It comes from the Wenlock Limestone of Dudley and belongs to the Fletcher Collection. Salter says of it (a 827): “Strongly costated and marked with lines of growth which decussate the ribs. Twice the size of the common Ludlow species.” The material is so poor that the specific description must necessarily be incomplete.

In a paper published some eight years ago, Prof. T. G. Bonney discriminated between the dominant characteristics of quartz schists from the Alps and quartzites modified by pressure. The distinctions as therein pointed out may be thus summed up.

The recent attempt I have made to show that the absolutely unanimous adverse criticism of Dean Buckland has arisen from a misapprehension of the facts of the case, has led me to enquire further whether the same cause may not account for far more important results in other similar cases, e.g., the attacks of Huxley on Bacon; of Lord Kelvin on Huxley; and of Lord Kelvin and Professor Sollas on Lyell: attacks which cannot fail to lead the unlearned to believe, not that the critics are right, but that all are wrong together, and unworthy of attention.