182 



MISS G. L. ELLES ON THE DELATION OE THE [May 1909, 



these have heen obtained from three different localities along the 

 southern slopes of the Deganwy Hills. The fauna from this lime- 

 stone includes 



Orthis calligrcnnma, Dalm. 

 Orthis plicata, Sow. 

 Orthis (Dinorthis) flahellulum, Sow. 

 var. 



Orthis vespertilio, Sow. ? 



Orthis sp. 



Strophomena aff. medic ostalis, Reed. 



Strophomena corrugatella, Dav. 



(3) Bodeidda or Trmwc/eMs- Mudstones. 

 These mudstones, as their name implies, are best seen near 

 Bodeidda, a mile and a half south-west of Conway, where there are 

 several good sections in quarries and along the road. The rocks 

 are generally blue-grey mudstones weathering light brown, Avhile 

 some bands have a characteristic mottled appearance. Some of the 

 bands appear to be quite unfossiliferous, but in others fossils are 

 abundant. The following are common : — 



Orthis (Balmanella) elegantula, 



Dalm. 

 Orthis (Helerorthis) retrorsistria, 



M'Coy. 

 Tentaculites anglicus, Salt. 



Plectambonites transversalis (Wahl.). 

 Plectambonites quinquecostata 



(M'Coy). 

 Christ iania tenuicincta (M'Coy). 



Trinucleus seticomis, var. bucklandi, 



Barr. 

 Cybele. 



Plectambonites transversalis (Wahl.). 

 Plectambonites quinquecostata 



(M'Coy). 



These exposures are mostly in the lower beds ; the higher beds 

 are better seen in an old brick-pit, close to where the footpath 

 to Oakwood Park Hotel leaves the Sychnant road, about three 

 quarters of a mile west of Conway. Here the beds contain a., 

 somewhat similar assemblage of forms ; but Christiania tenuicincta- 

 is especially abundant, and the Trinuclei are rather different. 



Trinucleus concentricus, var. portlccJci, 



Salt., and var. arcuatus, Smith. 

 Phacops (Acaste) brongniarti(l) Portl. 

 Calymene blumenbachii, Brongn. 

 Orthis (Dalmanella) elegantula, Dalm. 



These mudstones are also exposed in the fields north of Maes 

 Cadwgan and all round Bryn Bychan ; also at many places in the 

 streets of Conway and on the shore north of the Castle, where they 

 are succeeded by the Deganwy or PA«oojJS-Mudstones and the Con- 

 way Castle Grits. They are also well seen in a similar position v 

 north of the Bryniau Watch-Tower, on the Deganwy side of the river. 



(4) Deganwy or P/zacops-Mudstones. 



Between the fossiliferous THmtoZews-Mudstones and the Phacops- 

 Mudstones intervenes a thin band of light-coloured mudstone, which 

 appears to be wholly destitute of fossils ; this is seen on the road 

 south-east of Bryn Hendre, and the rest of the road down to the 

 village of Hendre is cut out in the fossiliferous mudstones with 

 Phacops (Dalmannites) mucronatus, Brongn., until these are suc- 

 ceeded by the Conway Castle Grit. 



1 For these and other identifications of brachiopods I am indebted to 

 Mr. F. R C. Reed. 



