6 EXPLANATION OF THE PLATES. 
Key’s End Hill, Malvern—Memoirs Geological Survey, -vol. iii, 
. 300. 
a Other localities given in list of Upper Lingula Flag fossils, at p. 250. 
Gellifwyog, Ffestiniog; Borthwood, Portmadoc; west side of Moel-y- 
gest, North Wales. 
Trish Localities. —Cooksgrove, near Duleek, county of Meath, collected 
by the Geological Survey of Ireland. A closely allied fossil, which 
appears to be identical with Callograptis elegans, or Salteri, Hall, was 
also obtained by Mr. C. Galvan, of the Geological Survey of Ireland, 
with several other interesting forms of the Graptolitide, resembling 
those figured by Professor Hall in the Paleontology of New York, and 
Decade 2, Geological Survey of Canada; from dark grey sandy and mica- 
ceous shales at Lady Elizabeth’s Cove, Tramore Bay, county of Water- 
ford. (See Explanations to Sheets 167, &c., of the Maps of the Geolo- 
gical Survey of Ireland ; Palzontological Remarks, by the author, p. 28.) 
MOLLUSCA.—BRACHIOPODA. 
Fia. 3.--a, 6, ec. LineguLteLta Davisi, M'‘Coy, sp. 
Lingula Davisii, M‘Coy, British Paleozoic Fossils, 1 L., fig. 7; and when 
distorted, Tellinomya lingulecomes, ib., pl. 1 K., fig. 18. 
Lingulella Davisii, Salter. Memoirs Geological Survey, vol. iii., p. 333, pl. 
i, figs. 7-12; and pl. iv., fig. 14. 
Lingulella Davisii. British Silurian Brachiopoda, by Thomas Davidson, 
Esq.; Paleontographical Society’s Memoirs, 1866, p. 56, pl. iv., figs. 
1-16. 
a. Original. A fragment ofslate, full ofthese thin flattened shells. Froma 
specimen in the Museum of the Geological Survey of Ireland; from Lin- 
gula Beds, Penmorfa, Tremadoc. 
b. Original. Enlarged view of one of the shells from fig. 3 a (interior ?), 
showing the numerous concentric strie, or ‘‘lines of growth,” which 
assume a granulated or bead-like appearance towards the upper part of 
the shell, gradually passing into smooth ridges, crossed by fine longitu- 
dinal lines or ‘‘stri,’’ which become stronger towards its lower edge. 
ce. Original. A distorted example of the same species formerly referred to 
Tellinomya, to show the eftect of pressure from cleavage. From a spe- 
cimen in the Museum, Geological Survey of Ireland. From Ffestiniog, 
North Wales. 
This Lingula, first discovered by Mr. Davis in 1845, from its abundance 
has given the name of Lingula Flags to the formation which it so emi- 
nently characterizes. 
Lincuia Fracs.—Everywhere in the middle band, rare in the lowest and 
highest portions; but, as remarked by Mr. Salter, ‘of nearly full 
size again in the sandy beds of the Upper Tremadoc slate. Memoirs 
Geological Survey,” vol. ili., p. 834. 
Localities mentioned in list of Lower Lingula Flag fossils :—Carnedd 
Filiast, Bangor ; Marchlyn-Mawr, Llanberis ; Tremadoc ; Ffestiniog ; Dol- 
gelly; rare in the lower black slates at Maentwrog, North Wales; 
Whitesand Bay, near St. David’s Head, Pembrokeshire, South Wales. 
Memoirs Geological Survey, vol. iii., p. 247. 
