The Rev. David Ure in his “History of Rutherglen and East Kilbride,” 1793, figures and describes a Carboniferous organism, pp. 328-29, pl. xx., figs 1, 2, as a “Millepore,” and says—“The Millepore is a very beautiful genus of the coralloides. It abounds in most of the lime quarries, not only in Kilbride, but in the West of Scotland. The specimens are in fragments, and commonly branched. They are from the thickness of a fine hair to that of a large quill. Some specimens continue to adhere to shells, &c., on which they were originally formed, as in fig. 1. The pores are round and of different diameters in the same specimen, fig. 2, which is greatly magnified. The extremities of the branches were originally round as at a. The Millepore is frequently spread on the surfaces of shells, entrochi, &c., like the Seratula pumila. ” Those who, like myself, have collected Carboniferous fossils from the Kilbride district, and compared them with Ure’s figures and the above description, now know that under the term “Millepore” he has confounded various smaller organisms found in the same strata, which bear a certain amount of external resemblance to one another, but are really distinct, both in form, size, and the character of the cells, and which are now grouped under different genera and species from those of the organism to which he specially refers. These are now known as Ceriopora interporosa, Phill., C. similis, Phill., Rhabdomeson gracile, Phill., R. rhombiferum, Phill., Hyphasmopora Buskii, Ether., jun., This 250-word extract was created in the absence of an abstract