248 CAMBRIAN BRACHIOPODA. 



316a [Davidson, 1883, p. 213], (For stratigraphic position and association, see p . 135 . ) Lower Ordovician : Llandeilo 

 at Craighead, Ardmillan Brae, and Balcletchie, all three in the Girvan district of Ayrshire, Scotland. 

 Acrotreta nicholsoni. 



3161) [Davidson, 1883, p. 211]. (For stratigraphic position and association, see p. 136.) Middle Cambrian: At Caim 

 Burn and Druidhill Bui'n, both in Dumfriesshire, Scotland. 

 Acrotreta sagittalis. 



316c [Geol. Survey Scotland, M4197d; personal communication, J. Home, 1910]. (For stratigraphic position and 

 association, see p. 136.) Lower Cambrian: Probably equivalent to those in band 6.or 7 of the section on the 

 north slope of Meall a Ghiiibhais [Peach and Home, 1907, p. 414], on the Bruachaig River, 2 miles (3.2 km.) 

 east-northeast of the Kinlochewe Hotel, Loch Maree, Ross-shire, Scotland. 



*Lingulella zeus. 



Olenellus lapworthi? Peach and Home. 



316d [Geol. Survey Scotland, M2646e, M2647e, and M4178d; personal communication, J. Home, 1910]. (For 

 stratigraphic position and association, see p. 136.) Lower Cambrian: About 500 feet (152.5 m.) above the 

 provisional base of the Cambrian and 75 feet (23 m.) below what is believed to be the top of the Lower 

 Cambrian, in the shales forming 5 and 6 of the section given by Peach and Home [1907, p. 414], in a small 

 burn on the north slope of Meall 4 Ghiubhais, 4 miles (6.4 km.) west-northwest of the Kinlochewe Hotel, 

 Loch Maree, Ross-shire, Scotland. 



*Micromitra scotica. 



Olenellus lapworthi? Peach and Home. 



317 [Davidson, 1883, p. 213]. Lower Ordovician: Coalpit Bay, County Down, Ireland. 

 Acrotreta nicholsoni. 



317a [Davidson, 1871, p. 340]. Middle Cambrian: At Bellewstown, County Meath, and at Balbriggan, County 

 Dublin, both in Ireland. 

 Acrotreta sagittalis?. 



31,7b [Davidson, 1866, p. 58]. Middle Cambrian: Shales at Bellewstown, County Meath, Ireland. 

 Lingulella davisi. 



318 [Davidson, 1869, p. 232]. (For stratigraphic position and association, see p. 135.) Upper Cambrian: Upper 



Lingula flags at Penmain Pool, west of Dolgelly, Merionethshire, North Wales. 

 Grusia lenticularis. 



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

 Lingula flags at Criccieth, Carnarvonshire, North Wales. 

 Grusia lenticularis. 



3181) [Davidson, 1869, p. 232]. (For stratigraphic position and association, see p. 135.) ITpper Cambrian: Upper 

 Lingula flags near Portmadoc, Carnarvonshire, North Wales. 

 Grusia lenticularis. 



318c [Davidson, 1868, p. 310]. (For stratigraphic position and association, see p. 135.) Upper Cambrian: Lower 

 Lingula flags at the Rheider Waterfall Valley and at Gwynfynydd and other places near Dolgelly, North 

 Wales. 

 Acrotreta sagittalis. 



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

 Sandstones in the middle portion of the Menevian at Porth-y-rhaw, St. Davids, South Wales. 

 Acrothele maculata [Davidson, 1871, p. 341]. 

 *Orbiculoidea pileolus [Davidson, 1868, p. 316]. 

 *Billingsella hick.si [Davidson, 1869, p. 230]. 



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

 portion of the Menevian at Camlan, North Wales. 

 Lingulella ferruginea [Davidson, 1871, p. 337]. 

 Acrothele maculata [Davidson, 1871, p. 341]. 

 Orbiculoidea pileolus [Davidson, 1871, p. 345]. 



318f [Davidson, 1871, p. 341]. (For stratigraphic position and association, seep. 136.) Middle Cambrian: Lower 

 portion of the Menevian at Gwynfynydd, North Wales. 

 Acrothele maculata. 



318g [Davidson, 1868, p. 310]. (For stratigraphic position and association, see p. 135.) Upper Cambrian: Lower 

 Lingula flags at Porth-y-rhaw, Pen-y-pleidiau, and several other localities near St. Davids, South Wales. 

 *Acrotreta sagittalis. 



