LOCALITIES. 249 



318h [U. S. National Museum]. (For stratigraphic position and association, see p. 136.) Middle Cambrian: Shalea 

 in the Menevian at St. Davids, South Wales. 

 Lingulella ferruginea. | Acrotreta sagittalis. 



Acrothele maculata. | Billingsella hicksi. 



3181 [U. S. National Museum]. (See 366c.) (For stratigraphic position and association, seep. 136.) Middle? 

 Cambrian: Red shales of the Caerfai gToup at St. Davids, South Wales. 

 Lingulella primaeva. 



318] [Salter, 1866b, p. 340]. (For stratigraphic position and association, see p. 136.) Middle Cambrian: Black 

 shales of the Menevian group at Pen-y-pleidiau, St. Davids, South Wales. 

 *Lingulella ferruginea. 



318k [Davidson, 1871, p. 337]. (For stratigraphic position and association, see p. 136.) Middle Cambrian: In the 

 Menevian rocks at Tafern Helig, North Wales. 

 Lingulella ferruginea. 



318 1 [Davidson, 1871, p. 337]. (For stratigraphic position and association, see p. 136.) Middle Cambrian: In the 

 Menevian rocks at the Waterfall Valley, near Maentwrog, North Wales. 

 Lingulella ferruginea. 



318m [Davidson, 1866, p. 57]. (For stratigraphic position and association,'see p. 135.) Upper Cambrian: Near the 

 base of the lower black slatea at the Waterfall Valley, near Maentwrog, North Wales. 

 Lingulella davisi. 



318n [Davidson, 1871, p. 337]. (For stratigraphic position and association, see p. 136.) Middle Cambrian: Red 

 shales at the base of the Harlech grits at St. Davids, South Wales. 

 Lingulella ferruginea. 



3180 [Davidson, 1871, p. 337]. (For stratigraphic position and association, see p. 136.) Middle Cambrian: Red 

 shales at the base of the Harlech grits at Solva, St. Davids, South Wales. 

 Lingulella feiTuginea. 



318p (references follow species). (For stratigraphic position and association, see p. 136.) Middle Cambrian: Sand- 

 stones in the middle portion of the Menevian at Ninewells, near St. Davids, South Wales. 

 Orbiculoidea pileolus [Davidson, 1871, p. 344]. 

 *Billingsella hicksi [U. S. National Museum and Davidson, 1869, p. 230]. 



318qi [Davidson, 1871, pp. 344-345]. (For stratigraphic position and association, see p. 136.) Middle Cambrian: 

 Yellowish-gray beds in the Harlech group, on the road between Solva and Whitechurch, St. Davids, South 

 Wales. 

 Orbiculoidea pileolus?. 



318r [Davidson, 1871, p. 344]. (For stratigraphic position and association, see p. 136.) Middle Cambrian: Sand- 

 stones in the middle portion of the Menevian at Solva Harbor, St. Davids, South Wales. 

 Orbiculoidea pileolus. 



318s [Davidson, 1868, p. 314]. (For stratigraphic position and association, see p. 135.) Upper Cambrian: Upper 

 Lingula flags at Ogof-ddu Cliff, Carnarvonshire, North Wales. 

 Orusia lenticularis. 



318t [Davidson, 1868, p. 314]. (For stratigraphic position and association, see p. 135.) Upper Cambrian: Upper 

 Lingula flags at Penmorfa Church, Tremadoc, Carnarvonshire, North Wales. 

 Orusia lenticularis. 



318u (references follow species). (For stratigraphic position and association, see p. 135.) Upper Cambrian 

 Upper Lingula flags at Gwerny-y-Barcud, North Wales. 

 Lingulella ferruginea [Davidson, 1868, p. 315]. 

 Orusia lenticularis [Davidson, 1868, p. 314]. 



318v (references follow species). (For stratigraphic position and association, see p. 135.) Upper Cambrian: 

 Upper Lingula flags at Rhiwfelyn, North Wales. 

 Lingulella ferruginea [Davidson, 1868, p. 315]. 

 Orusia lenticularis [Davidson, 1869, p. 232]. 



318w [U. S. National Museum]. (For stratigraphic position and association, see p. 135.) Upper Cambrian: Trema- 

 doc shale on Ramsey Island, St. Davids, South Wales. 

 Eoorthis carausii. 



