EXPLANATION OF THE PLATES. aie 
Urrer Devonian AND CARBONIFEROUS LiIMESTONE.— Upper Devonian, 
Petherwin group (Etheridge). Carb. Limest., Bolland, Yorkshire, 
Derbyshire ; counties Limerick and Meath. 
Fic. 6.—BetieropHon Unit, Fleming. 
Brit, An., p. 838, Geol. Yorks., vol. ii., pl. xvii., figs. 11,12. Portl. Geol. 
Rep., pp. 400, &c., pl. 29, fig. 9. (B. interlineatus and B. D‘Orbignii), 
figs. 11 and 12. 
Original. Side view. Lower Limestone shale, Draperstown, Londonderry. 
Mus. G. 8. I. 
Uprrrr DEVONIAN AND CarzoniFERous.— Upper Devonian, Baggy and 
Pilton groups, N. Devon; Lower Limestone shale, Co. Cork; Carb. 
Limest., Rutherglens; Bolland, Tyrone, Fermanagh, and Londonderry ; 
Coal Measure shales, near Abbeyfeale, Co. Limerick ; Coal Island, 
Dungannon, Tyrone, Ballycastle, Co. Antrim. 
CEPHALOPODA. 
Fic. 7.—Navrizus porsauis, Phillips. 
Geol. Yorks., vol. ii., p. 23, pl. xvii, fig. 17; pl. xviii, figs. 1, 2. 
Original. Keduced to half natural size; side view, from Carb. Limest., 
Rathkeale, Co. Limerick. Mus. G.S. I. 
CARBONIFEROUS LimEsToNE.—Bolland, &c. It occurs at many Limestone 
localities in the South of Ireland. 
Fie. 8.—a, 6. OrrHocERAS cInctum, Sowerby. 
Min. Conch., pl. elxxxviii., fig. 3. 
Original. a. Part of the shell removed, showing septal divisions. 6. Out- 
line of septum and siphuncle. From Kilgrogan, Co. Limerick. 
DEVONIAN AND CARBONIFEROUS.—Middle Devonian Torquay. _ Upper 
Devonian, Petherwin, Carb. Limest., Preston ; Bolland, ]sle of Man, Co. 
Limerick, and Castleknock, Dublin. 
Fic. 9.—a, b. Gonzarites sppyaricus, Dartin. 
Petrif., pl. vii. figs. 8—5. Phil. Geol., Yorks., vol. ii., pl. xix., figs. 4—6. 
(P. crenistria), figs. 7—9. : 
Original. a. Side view, with portion of shell removed, showing septa. 
b. Outline of septal division ; from Carboniferous Limestone, Glenbane, 
E., Co. Limerick. Mus. G. S. I. 
CaARBONIFEROUS LimESTONE, AND Coat Merasurrs.—Carb. Limest., 
Bolland, Derbyshire, Isle of Man; Cos. Kerry, Limerick (abundant) ; 
Co. Cork. Coal Measures, Cos. Clare, Limerick, Tipperary, Meath. 
With this species it is considered several others may be united, especially 
G. crenistria, See Expl. of Sheet 142, Geol. Surv. Irel., p. 12. 
