^{page 304 note 1} My thanks are also due to Messrs. J. Plant, R. A. Eskrigge, G. H. Morton, D. Homfray, and J. C. Barlow for the communication of their specimens; but particularly to Messrs. H. Hicks and T. Belt, who have presented me with a fine and extensive series of specimens collected by them in North and South Wales.

^{page 306 note 1} “The little specimen kindly examined and pronounced by you (Mr. Davidson) to be Ling. ferruginea was recently found by me at Porthclais Harbour, near St. David's, in one of the lowest beds belonging to the purple and red Cambrian rocks, exposed in this neighbourhood—at the very base of a series looked upon as the equivalent of the Harlech Group of Sedgwick and of the Upper Longmynds of Murchison, and directly overlying olive green grits and shales like those of North Wales and Shropshire. Its position, therefore, is about 1200 feet lower in the series than the specimen described by Mr. Salter and myself in the Quarterly Journal of the Geol. Soc. (vol. xxiii.), which was found, as there stated, in one of the red beds of the upper part of the series; and also about 900 feet lower than the fauna subsequently discovered by me in the intermediate beds, consisting of new species of Conocoryphe, Paradoxides, Microdiscus, Theca, Agnostus, and Discina. It is undoubtedly the earliest Brachiopod hitherto found: and it furnishes one of the first unmistakable evidences, yet obtained (next to the minute Rhizopod Eozoon), of so very early an existence of animal life upon our globe; lob-worms and fucoids claim, no doubt, an equal antiquity, but they are not of so high a form of organization. The Harlech fauna includes, in addition to the above-mentioned species of Conocoryphe, Paradoxides, etc., another trilobite (Palæopyge Ramsayi) found by Mr. Salter in the Longmynds; also the well-known Oldhamia, at Bray Head. These, inclusive, Comprise all the fossils yet discovered in the enormous series intervening between the Laurentian Rocks and the Menevian group.”—(H. Hicks).

In the Menevian Group,' along with L. ferruginea in addition to the other Brachiopoda from the group to be described in this paper, the following fossils have been found, namely: Paradoxides Davidis; P. Hicksii; P. aurora; Conocoryphe variolaris; G. humerosa; O. applanata; C. bufo; Microdiscus punclatus; Anopolenus Salteri; A. Henrici; Erinnys (Harpides) venlosa; Holoeephalina primordialis; Agnoslus Davidis; A. Barrandii: A. Eskriggii; Leperditia solvensis; L. vexata: Protospongia fenestrata; P.flabella; P. diffusa: Protocystites, sp.; Theca corrugata; T. stillelto; T. penultima; Stenotheca cornucopia; Cyrtotheca hamula; etc., etc. I may also here remind the reader that it is interesting to notice how important and well-known this group has become within the last few years. In 1862 Mr. Salter succeeded in finding fragments of Paradoxides and another Trilobite Microdiscusin the rocks of St. David's, and these were the first indications obtained of the presence of this fauna. In the following year Mr. Hicks succeeded in discovering no fewer than forty new species in these beds; these now form the great and well known fauna of the ‘Menevian Group,’ which has heen proved subsequently to extend not only through much of the N.-West of Pembrokeshire, but also in various districts in North Wales, and always to contain the same species as those first found in the district. Mr. T. Belt's valuable researches on the ‘Lingula Flags’ will be found recorded in Vols. IV. and V. of this Magazine.