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and parts of different species of pines, of tithymals, cereuses, See .;of large reeds, and of some arborescent plants. His account isaccompanied by engravings, the descriptions of which are neces-sarily very short. His first figure is of an impression of a plantwith rhomboidal work on it, with which three long narrow leaveswere found, which appeared to belong to it. This specimen wasfrom Oswestry , in Shropshire ; a similar figure is given by Volck-man, in his Silesia Subterranea, Tab. XXII. Fig. 2.; and it seemsto resemble that described in Dr. Woodward’s Catalogue, B. 107,q. 22. q. 32. p. 106. The second and fourth seem to be of the reedkind, having knobs placed in rows on their surface, like the vesiclesof some species of the rushes. This specimen seems to have beensimilar to one described by Dr. Woodward, B. a. 1. p. 9- The thirdimpression he supposes to have derived its figure from some plantof the fir kind. The fifth specimen is from Mostyn colliery, Flint-shire: its surface, when attentively viewed, exhibits a reticular im-pression of mesh-work, or rhomboidal hollows; the sides of therhombs, or the net-work, being raised in relief. In Plate I. Fig. 6.you will find the representation of a similar specimen from France ;and serves as an instance of the peculiarity of surface these im-pressions frequently possess. The appearance here so varying, withthe change of light, as hardly to admit a fair representation of theproteal surface; the artist, with every exertion, was not able tosucceed to his wish in this respect; since although in some pointsof view the rhomboidal form would appear, in most others thetransition into somewhat of an oval appearance would be dis-coverable. In the centre of these projecting bodies, small holes areobservable, being such as might be expected for the insertion ofsetae, or of setaceous leaves. In the sixth of Mr. Da Costa’s spe-cimens, studs, apparently also for the insertion of setae, are regu-