320 Reports and Proceedings. 



the species Broioniana, after Mr. D. J. Brown, who first drew his 

 attention to it. 



3. " On the oldest known British Crab (Protocarcinus longipes, 

 Bell, MS.) from the Eorest Marble (Great Oolite) of Malmesbury, 

 Wilts." By Henry Woodward, Esq., F.G.S., F.Z.S. 



The author stated that three genera and twenty-five species of 

 Brachyurons Crustacea had already been described by Professor 

 Eeuss and H. von Meyer from the Upper White Jura of Geimany ; 

 but as no limbs or abdominal segments had been met with, it was 

 more doubtful where to place them than the species now described, 

 which had nearly all its limbs in situ, and a portion of the abdomen 

 imited to its carapace. Protocarcinus closely resembled the common 

 spider-crabs — the Maidce and Leptopodides living on our own coasts 

 at the present day. 



4. " On the species of the genus Eryon, Desm., from the Lias and 

 Oolite of England and Bavaria." By Henry Woodward, Esq., 

 F.G.S., E.Z.S. 



The genus Eryon of Desmarest was established for certain ex- 

 tremely broad and flat forms of Astacidce found in the Solenhofen 

 limestone, near Munich, and first described in 1757. The late Dr. 

 Oppel has recorded fourteen species, two of which, E. Barrovensis, 

 and E. [Coleia) antiquus, are from the Lias of England. Mr. Wood- 

 ward gave descriptions and figures of E. Barrovensis, M'Coy, and 

 five other species, namelj^ E. crassichelis, E. Wilmcotensis, and E. 

 Brodiei, from the Lower Lias ; E. Iloorei, from the Upper Lias of 

 Ilminster ; and E. Oppeli, from the Lithographic stone of Solenhofen. 



5. " Notes relating to the Discovery of Pnmordial Fossils in the 

 Liugula flags in the neighbourhood of Tyddyngwladis Silver-lead 

 Mine." By J. Plant, Esq., F.G.S.' 



The discoveries described in this paper included the finding of 

 Paradoxides near the second adit of the Tyddyngwladis mine, in the 

 Lower Lingula-beds, and subsequently of further specimens in the 

 neighbourhood, associated with fragments of Anopolenus and Theca. 

 A detailed examination of the district, undertaken by the author and 

 Mr. E. Williamson, had proved the correctness of their opinion, that 

 the strata at Tyddyngwladis belong to the Primordial zone, and that 

 within a limited area, extending east from the boundary line of the 

 Lower Cambrian grits, the rocks ought to yield a series of fossils of 

 Primordial types. This examination had also enabled them to draw 

 a section extending from the junction of the Lower and Upper 

 Cambrians at Cefn Ddiddw to the base of Craig-y-Dinas, which was 

 described in detail by the author, who adopted the following division 

 of the beds : — 



Lower Cambrians or Harlech Grits. feet. 



/, -r- 1 T, J ( Tyddyi]o:wladis slates 1,136 



Lower Lmgula-beds I (.; JgP.^^ ^l^^g^ 2,500 



Upper ; Middle Linffiila-beds Hafod Owen sandstones 5,000 



Cambrians. j . • i k -q / Ehywffely slates ) , ... 



^ Upper Lingula-beds | Moel Gron slates j J^ 



10,136 

 1 See Trans. Manchester Geol. Soc, ante, p. 317. 



