32 . EXPLANATION OF THE PLATES, 
BRACHIOPODA. 
Fic. 3.—LinGua ovata, WM‘ Coy. 
Silurian Fossils of Ireland, p. 24, pl. iii., fig. 1. 
From the figure in Brit. Sil. Brach. Pal. Soc., pl. ii., fig. 20. 
Carapoc.—Sil., fourth edition, p. 525. Localities, Bala, N. Wales, Cat. 
’ Brit. Foss., p. 138. Slates of Penmorfa, M‘Coy ; not uncommon in the hard 
Caradoc grits of Grangegeeth, Co. Meath, Mus. G. 8. I. Carrickanearla, 
Chair of Kildare, Mus. Sir R. Griffith ; Caradoc beds, at Marshbrook, and 
Horderly, Salop; near Bala, and east of Bala Lake, Merionethshire; Llan- 
dwddyn and Meifod, Montgomeryshire ; S. of Llangollen, Denbighshire ; 
also in the Lower Caradoc or Bala shales of Westmoreland (Brit. Sil. . 
Brach., p. 39). In the Mus. Geol. Surv., Irel. are specimens believed to 
be this species, in limestone, Chair of Kildare, and from Caradoc beds at 
Ballybro’ and Carrickadaggan, Co. Wexford; Bellewstown, Co. Meath ; 
and Desertcreat, Tyrone. 
Fig. 4.—a, 6. D1scina oBLONGATA, Portlock, sp. 
Orbicula subrotunda, levigata, and elongata, Geol. Rep. Londonderry, &c., 
p- 445, pl. xxxii.,fig. 10-13. Discina, Brit. Sil. Brach., p. 66. 
a, 6. Front and side view of the upper or free valve. From Mr. Davidson’s 
figures in Brit. Sil. Brach., pl. vi, fig. 1. 
Caravoc.—Siluria, fourth edition, p. 524. Caradoc schists, Desertcreat, Co. 
‘Tyrone ; Portlock collection, Mus. G. S. I. “ Not uncommon in the sandy 
schists of Bardahessiagh, common in the slates of Tirnaskea, Pomeroy, Co. 
Tyrone.” M‘Coy, Sil. Foss. Irel., p. 24. It has also been collected from 
corresponding beds at Tramore, Co. Waterford, Mus. G. 8.1. Mr. Da- 
vidson very properly considers D. oblongata, levigata, and subrotunda, all 
from the same rock and locality, as ‘ slight modifications of a single species.” 
in England, on the authority of Mr. Salter, he states it to have been found 
in the Upper Caradoc beds of South Shropshire. In Mem. Geol. Surv., 
vol. iii., p. 266; the variety D. subrotunda is included in the list of Cara- 
doe fossils from Llanfyllin, Montgomeryshire. 
Fig. 5.—a, b. CRANIA DIVARICATA, M‘Coy, sp. 
C. antiquissima (?) M‘Coy (not of Eichwald), Sil. Foss. Irel., p. 25. Pseudo- 
crania divaricata, M‘Coy. Ann. Nat. Hist., second series, vol. viil., p. 388 
(1851). Crania catenulata, M. S., name attached to specimens in Mus. 
G. S. L, Explanation to Map 119, p. 9, Geol. Surv. Irel.; Pal. notes by the 
author. C. divaricata, Sil., second edition, p. 212; and Brit. Sil. Brach., 
Botlsh 
a. pORguTaL From a slightly distorted specimen showing both valves, in dark 
grey slaty schist, Bala, Mus. G. S. I. 
Original. Exterior, showing radiating striae; from greenish grey slaty 
schist, Grange Hill, Kildare, Mus. G. S. I. 
e. Cast of interior of dorsal valve, exhibiting the muscular impressions, de- 
scribed by Mr. Davidson in Brit. Sil. Brach. ; explanation to pl. viii., fig. 11 
and 11a; taken from that figure and specimens in Mus. G. 8. I.; from 
same locality as 5 6. 
b. 
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