Even Prof. Heer himself had united, together specimens presenting greater differences in this respect than those which he distinguished. He considered Cyclostigma kiltorkense, C. minutum, and Lepidodendron Veltheimianum to be founded on different parts of one species. In the Kiltorkan fossils the outer surface of the original stems was often broken up into small fragments, the phyllotaxy on which proved them to be portions of large stems, and not entire branches. As to Knorria, it was certainly the interior cast of the stem of Lepidodendron, with casts of the channels through which the vascular bundles passed with some cellular tissue to the leaves ; and the specimen figured showed that it belonged to a branch similar to that represented as C. minutum. He considered that the four supposed species ascribed to three genera, were only different forms of the same plant.
2. On some Undescribed Fossils from the Menevian Group. By Henry Hicks, Esq., F.G.S. With a Note on the Entomostraca, by Prof. T. Rupert Jones, F.G.S.
[Plates V.-VII.]
(Read December 6, 1871*.)
In continuation of the descriptions of the fossils from the Menevian group which have at different times appeared in the ' Journal ' of the Geological Society, I propose now to add those forms, which though frequently referred to in our communications, have hitherto remained undescribed. So far as present researches have gone, these will also complete the fauna of the Menevian group as exhibited in Wales. The additions made to the fauna of the Cambrian rocks (Longmynd and Menevian groups) by those researches, include no less than fifty-two new species, belonging to twenty-three genera. The following Table shows to what orders these belong, and in what proportion they occur in these early rocks.
Trilobites 10 genera including 31 species. Bivalve crustaceans 4 " " 4 " Brachiopods 4 " " 6 " Pteropods 3 " " 6 " Sponges 1 genus " 4 " Cystideans 1 " " 1 "
If we now add to these the annelids which had been previously discovered in these rocks, we have at least seven orders represented in this fauna, the earliest at present known. These same groups are also more or less present and tend to characterize these early deposits wherever found ; but no country has up to the present time produced a more varied fauna or a greater richness in types than England. Scandinavia has a larger number of species, but not so many groups. On referring to the Tables in M. Barrande's excellent work on
- See p. 41 of the present volume.
