120 EXPLANATION OF THE PLATES. 
Fic. 9.—a, 6. Psammopus porosus, Agassiz. 
Poiss. Foss., vol. ii., p. 112, pl. xiii, figs. 1—18. Portl. Geol. Rep. 
pliaciv., cA mie. al: 
Original. a. Tooth. 6, Enlarged portion of poriferous surface. Carb. 
Limestone, Armagh. Mus. G.%. I. 
CARBONIFEROUS LIMESTONE AND SHALE.—C. L. Bristol, Armagh. Lower 
Limestone shale, Hook Head, and Colloney River, near Sligo. 
Fic. 10.—Oropvus ramosus, Agassiz. 
Poiss. Foss., vol. iii., p. 97, pl. xi., figs. 5—8. 
Original. ‘Tooth, from Lower Carbonif. Limest. Mountrath, Queen’s Co. 
CARBONIFEROUs LIMESTONE AND SHALE.—C. L, Bristol; Queen’s Co., and 
Co. Cork. Lower Limest. shale, Hook Head. 
Fie. 1].—Hetopvs cippervius, Agassiz. 
Poiss. Foss., vol. iii., p. 106, pl. xii., figs. 1, 2. 
Original. ‘Tooth; from Carb. Limest. Armagh. 
CaARBONIFEROUS LimEstoNe.—Bristol; Armagh. 
Fic. 12.—Pacitopus Jonest, Agassiz. 
Poiss. Foss., vol. iii., p. 174, and transversus, ibid. 
Portl. Geol. Rep., p. 468, pl. xiv. A, figs. 6, 7. 
Original. Tooth; from Carb. Limest. Armagh. 
Fie. 13.—Perratopus Hastinestm, Agassiz. 
Poiss. Foss., vol. iii., p. 174. Portl. Geol. Rep., p. 468, pl. xiv., fig. 10. 
Original. Tooth; from Carb. Limest. shale, Kesh, Fermanagh. Mus. 
Gsa 
CARBONIFEROUS LimEsTONE AND SHALE.—Ticknall. Cat. Brit. Foss., 
p. 287. Carb. Limest. Armagh. Shale, Clogher, Tyrone; Kesh, Fer- 
managh. 
LEPIDOGANOIDEIL—HOLOPTY CHIDA. 
Fic, 14.—Rurtzopus Hrpperrr, Agassiz, sp. 
Holoptychius, Agassiz Poiss. Foss., vol. ii., part ii., p. 180, Portl. Geol. 
Rep., p. 464, pl. xiii., figs. 1—13. Rhizodus, Owen, Odontography, 
pl. xxxv., fig. 2. 3 
Portion of Jaw with large and smaller teeth ; from Coal Measures, Burdie 
House. Owens Odontography, pl. xxxv., fig. 2. 
CoaL MEASURES,—Burdie House, Edinburgh. 
