During the past two years several core-borings have been put down in South Durham in order to prove extensions of the Productive Coal Measures. In passing through the cover of Magnesian Limestone, here up to 300 feet thick, quite the most arresting feature was the presence of innumerable cavities of irregular distribution. These are especially characteristic of the Lower Limestones, and are of all sizes from tiny geodes almost completely infilled with calcite to gashes which cut deep into the heart of the 6 in. core. They are usually lined with calcite in a variety of forms; far more rarely there are other minerals among which fluorite and barytes seem to be the most abundant.

The material to be described was collected in the Shotts-Newhouse area (Sheet 31) of the Central Coalfield from the mussel bands above the Shotts Gas and presumed Lower Drumgray Coals. These horizons are within the Ovalis Zone (Weir and Leitch, 1936, pp. 704, 707). Fossils from above the presumed Lower Drumgray Coal were collected from the waste tip of South Langridge Colliery; material from the Shotts Gas was obtained from the tips at Fortissat, Hassockrigg, and Hirstrigg collieries.

The Palaeozoic rocks of the Girvan district have long been known for their rich faunal content, which has been studied by many palaeontologists. Trilobites are so abundant that they have been dealt with in a special monograph by Reed (1903−6). Since the publication of the monograph, however, continued collecting has made possible the description of further species and the amplification of many of the original descriptions; much of this has been accomplished by the publication of three supplements to Reed's monograph. The present paper is devoted to a consideration of the hypostomes of some Girvan trilobites. Professor A. E. Trueman has taken a keen interest in its preparation, and I desire to thank him for his very valuable assistance in correcting and improving the text; I must acknowledge again my indebtedness to Dr. F. R. C. Reed for the loan of literature.

In a recent paper on the Wenlock and Ludlow rocks of the district around Gwytherin, North-Western Denbighshire, Professor Boswell deals with an area which lies to the south of the Llangerniew district that I mapped and described a few years ago.

The Whidborne Collection of Devonian fossils from Devon and Cornwall now in the Sedgwick Museum, Cambridge, contains the majority of the specimens and nearly all the types described and figured by him in his memoir published by the Palaeontographical Society, vols. xlii-lii, between the years 1889–1898. The following notes have been made on a re-examination of certain of his Upper Devonian specimens in the light of more recent work and other material, though unfortunately many of the fossils are too imperfectly preserved for a satisfactory determination. A comparison of several of the species with those of Sowerby's types described and figured in 1840 has been of much value. Those specimens in the Whidborne collection which require no further remarks or are so poor that a correct identification is deemed at present impossible are omitted.