108 EXPLANATION OF THE PLATES. 
Fre. 5.—a, 6. Certopora ruompirera, Phillips, sp. 
Millepora, Geol. Yorks., pl. i., figs. 34, 35. 
Original. a. Natural size. 6. Enlarged portion, Hook Head, Co. Wex- 
ford. 
DEVONIAN AND CaRBONIFEROUS Limestone.— Upper Devonian, Baggy and 
Pilton, North Devon. Carboniferous, Yorkshire; Ireland. 
C. gracilis is believed to be identical with this species. 
BRACHIOPODA. 
Fic. 6.—a, 6, c. Linevta squamirormis, Phillips. 
Geol. Yorksh., vol. ii., pl. xi., fig. 14. Davidson, Brit. Carb. Brach. (Pal. 
Soc.), p. 205, pl. xlix. 
a. External view of shell, from Brit. Carb. Brach., pl. xlix., fig. 4. 
b. Interior of ventral valve ; op. cit., fig. 10. ¢. Portion of the shell 
enlarged, reduced from fig. 7. 
Upper DrvonIAN AND CARBONIFEROUS.— Upper Devonian, Baggy and 
Pilton, N. Devon. Lower Carboniferous, ‘*Coomhola.” Lower Limest. 
shale, and Carb. Limest. Coal Measures, lower and middle. ‘ his is 
a common species in certain Scottish strata, and localities, and is found 
likewise in England, and in Ireland. Davidson, Brit. Carb. Brach., 
p. 205. 
Fie. 7.—a, 6, c. Discrna nitipa, Phillips, sp. 
Orbicula, Geol. Yorksh., vol. ii., p. 221, pl. ix., figs. 10—13. 
Discina cincta, Portl. Geol. Rep., p. 446, pl. xxxi., figs. 15, 16. 
D. nitida, Dav. Scottish Carb. Brach., pl. v., figs. 22—29. 
Original. a. Upper or conical valve in Ironstone, Coalbrook dale. 
b. Lower or flat valve; Carb. Limest. shale, Benburb, Co. Tyrone. 
ce. Side view, in outline, to show elevation of upper valve. 
Urrrer DEVONIAN AND CARBONIFEROUS.— Upper Devon., Baggy and Pilton, 
N. Devon. Lower Carboniferous to Coal Measures inclusive. It is 
a common shell at many localities in England, Scotland, and Ireland ; 
especially in the Lower Coal Measures of the two latter countries, 
Fie. 8.—a, b. e. Cranta quaprata, If‘ Coy, sp. 
Orbicula, M‘Coy, Carb. Foss. Irel., p. 104, pl. xx., fig. 1. 
Crania, Dav. Scot. Carb. Brach., pl. v., figs. 12—21. 
a. From Carb. Foss. Irel., pl. xx. fig. 1. 6. Interior of lower or attached 
valve, from Brit. Carb. Brach., pl. xlviii., fig. 9. ¢. Side view in outline, 
to show elevation of upper valve. Rahan’s Bay, Co. Donegal. 
CARBONIFEROUS LimEesToNE.—Holwell, near Frome; several localities in 
Scotland; and in Carboniferous shale. Co, Donegal. 
Fic. 9.—a, 6. Terepratuta Hastata, Sowerby. 
Min. Conch., pl. 446, figs. 1, 2, 3. Brit. Carb. Brach., pl. i., figs. 1—12. 
