EXPLANATION OF THE PLATES, 39 
and Mem. Geol. Surv., vol. iii, p. 265. It has also been collected at 
Sheveroe, near Rathdrum, Co. Wicklow, by the Geol. Survey of Ireland. 
TRILOBITA. 
Fic. 4.—a-d. AGNosTuUs TRINODUS, Salter. 
Memoirs Geological Survey, vol. ii., parti., p. 351. B. converus, pl. viii., 
figs. 12, 13, vol. ii., pl. xix., fig. 8. Trinodus agnostiformis, M‘Coy, Sil. 
Foss., Irel., pl. iv., fig. 3. 
a. Original. Natural size. Head; in light grey limestone, Chair of Kildare. 
Mus. Geol. Surv. Irel. 
b. Original. Enlarged from 4 a, 
ec. Original. Natural size. ‘Tail; in dark grey limestone, Portraine, Co. 
Dublin. Mus. Geol. Surv. Irel. 
d. Original. Enlarged from 4 ec. 
Carapoc.—Sil., fourth edition, p. 515. | Localities—Shineton, near Cres- 
sage, Shropshire ; Haverfordwest, S. Wales; near Bala and Cerrig-y- 
Druidion, N. Wales; near Girvan, Ayrshire. Mem. Geol. Surv., vol. iii., 
pp. 263 and 298. Portraine, Co. Dublin; Annestown, near Waterford ; 
and Chair of Kildare, Co. Kildare. Mus. G. S. I. 
Fic. 5.—a, 6, c. ILLZNUS BOWMANNI, Salter. 
Memoirs Geological Survey, vol. ii., part i., pl. viii., figs, 1-3. 
Illenus centrotus, Portl. Geol. Rep., pl. x., figs. 3-6. 
a, Original. Head; in light grey limestone, Chair of Kildare. Mus, Geol. 
Surv., Irel. 
b. From Mem. Geol. Surv., vol. ii., part i., pl. vii., fig. 2; Tyrone; from a 
specimen in the Portlock collection. Geol. Surv. 
c, From same plate, fig. 3, a small perfect specimen, and from the same col- 
lection. 
Carapoc and Liranpovery.— Sil., fourth edition, p. 518. Localities, 
near Haverfordwest and Llandeilo, M. G. S., vol. i1., part i., p. 339. 
‘“« Everywhere in Britain.” M.G.S., vol.ii., p.317. Portraine and Lam- 
bay, Co. Dublin; Chair of Kildare ; Carrickadaggan, near New Ross, 
Wexford; Newtown Head and Tramore Bay, Waterford; Desertcreat, 
Tyrone. Mus. G. S. I. 
Fic. 6.—a, b. TRINUCLEUS CONCENTRICUS, Eaton, sp. 
T. ornatus, Mem. Geol. Surv., vol. ii., part i., p. 349, pl. ix., figs.1,2. 7. 
Caractaci, Sil. Syst., pl. xxiii., fig. 1. 
a. From M.G.S%.,vol. ii., parti., pl. ix., fig. 1. Entire animal ; locality not 
mentioned, 
b. Original. Side view of the head; showing fringe, cheek spine, and pro- 
minent glabella, in dark grey micaceous schist, Desertcreat, Tyrone. From 
Portlock collection. Mus. G. 8. I 
LLANDEILO and CARADOC, Sil., fourth edition, p. 521. Localities—Llan- 
deilo Flags, Dynevor Park, Llandeilo, Mus. G. S.I. Upper Llandeilo, 
Craig-y-glyn, S. Wales. M. G.S., vol. iii., p. 258. Caradoc. Several 
localities in N. Wales; ibid., p. 265. ‘‘ Caradoc rocks of Britain every- 
G 
