EXPLANATION OF THE PLATES. 69 
Fig. 7.—HOMALONOTUS DELPHINOCEPHALUS, Gireen, sp. 
alononotus. Sil. Syst., p. 651, pl. vii. bis, fig. 1. a. b. Sil., 4th edition, 
Peet). Bossa], fie. 1. 
Original. Reduced to half natural size, from a plaister of paris cast “of 
Mr. Blackwell’s specimen, Wenlock limestone, Dudley Castle, in Mus. 
G5. 1, 
WeENtLock.—Sil., 4th edition, p. 518. ‘ One of the chief fossils of the Lower 
Wenlock or Woolhope limestone, also occurring in the Wenlock lime- 
stone; ibid., pp. 111, 121. Localities: Woolhope and Dudley. Cat. 
Brit. Foss., p. 112. 
Fic. 8.—PROETUS LATIFRONS, M‘Coy, sp. 
Forbesia. Sil. Foss. of Irel., p. 49, pl. iv., fig. 11. Proetus. Mem. Geol. 
Surv., vol. ii., pt. 1., p. 337, pl. iv., fig. 1. Sil., 4th edition, p. 520. 
Original. Wenlock limestone, Dudley. Mus. G. 8. I. 
LLANDOVERY TO LupLow.—Sil., 4th edition, p.520. ‘‘ Far from rare in 
Wenlock Strata ;” ibid., p. 235. Llandovery, Penwhapple Glen, Ayr- 
shire. Mus.G.S. [. Upper Llandovery, common in the shale of 
Uggool, Ballaghaderreen, Co. Mayo. Sil. Foss. of Irel., p. 50. Wen- 
lock rocks, Clogher, Kerry. Mus. G.S.I.  Castle-craig-Gwyddon ; 
Malverns. M.G.S., vol. iii., p. 360. 
Upper Ludlow rock, Usk, Monmouthshire. M. G. S., vol. ii., pt. 1, p. 338. 
Kendal. Mus. G.S.I. Derrymore Glen, Kerry. Mus. G. 8. I. 
PHY LLOPODA. 
Fig. 9.—a, b. Beyricnia Kia@pent, M‘Coy. 
Ann. and Mag. Nat. Hist., second series, vol. xvi., pl. vi. Suil., 4th edition, 
. 016. 
a, ae Sil., 4th edition, p. 234, Foss. 64, fig. 4. Enlarged figures of 
both valves (the natural size, about one-sixteenth of an inch, was inad- 
vertently omitted to be shown.) 
LLANDOVERY TO Upper Luptow, Passage Beds, Sil., 4th, edition, p. 516. 
‘©The most abundant Upper Silurian species of these small bivalve crusta- 
ceans is very plentiful from the base of the Wenlock shale to the highest 
Ludlow stratum, varies greatly in shape, but is a good index of the 
Upper Silurian, though found sometimes in the Llandovery rocks ;” ibid., 
p- 236. Localities: Shropshire; North and South Wales; in Ireland, 
at Curracullcuagh, Co. Kerry. 
