niCKS MENETIAJST DOSSILS. 173 



Even Prof. Heer himself had united, together specimens presenting 

 greater differences in this respect than those which he distinguished. 

 He considered Cyclostlgma hiltorlcense, C. minutum, and Lepidoden- 

 dron Veltlieimianum 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 vas- 

 cular 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 sup- 

 posed species ascribed to three genera, were only different forms of 

 the same plant. 



2. On some Undesckibed Possils from the Menevian Gkotjp. J3y 

 Henet Hicks, Esq., F.G.S. With a Note on the Entomosteaca, 

 by Prof. T. Ritpert Jones, F.G.S. 



[Plates V.-VII.] 



(Eeacl December 6, 1871*.) 



Iis^ 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 thej^ occur in these early rocks. 



Trilobites 10 genera including 31 species. 



Bivalve crustaceans 4 „ „ -1 ,, 



Brachiopods 4 „ „ 6 „ 



Pteropods 3 ,, „ 6 „ 



Sponges 1 genus ,, 4 „ 



Cystideans 1 ,, ,, 1 ,, 



If we now add to these the annelids v/hich had been previously dis- 

 covered 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. 



