EXPLANATION OF THE PLATES. 00 
PLATE XIX. 
FOSSILS OF THE WENLOCK ROCKS. 
HYDROZOA?—GRAPTOLITIDZ. 
Fig, 1.—a-d. GRAPTOLITHUS PRIODON, Bronn, sp. 
G. Ludensis, Sil. Syst., p. 694, pl. xxvi., figs. 1,2. G. priodon, Sil., 4th 
ed., p. 523. 
a. Original. Compressed ; in grey slate (Upper Silurian) ; from near Bird 
Hill, three miles S. of Killaloe, Co Tipperary. Mus. G. S. I. 
6. Original. Uncompressed portion, in dark grey calcareous rock (Upper 
Silurian) ; from near Barnane House, four miles north-east of Borrisoleigh, 
Co. Tipperary. Mus. G. S. I. 
ec. Original. Enlarged portion of 1 5. 
d. Original. View of uncompressed specimen ; showing cell openings ; 
from same locality as 1 b. 
Caranoc to Luptow.—Sil., 4th ed., p. 523. At page 62 of the work cited 
the range of this very characteristic Upper Silurian fossil is stated to be 
from the Llandeilo to the Ludlow rocks inclusive. It is, however, the only 
species of graptolite which is abundant in the upper division of the Silu- 
rian formation occurring where argillaceous sediments prevail, at numerous 
localities in the British Islands. 
ANNELIDA. 
Fig. 2.—a, b. CORNULITES SERPULARIUS, Schlotheim. 
Silurian System, p. 627, pl. xxvi., fig. 5. 
a. From Sil. Syst., pl. xxvi.; and Sil., 4th ed., pl. xvi., fig. 6. Wenlock 
limestone, Ledbury ; and specimen in Mus. G. S. I. from Malvern 
Hills. 
b. Enlarged portion ; from Sil. Syst., pl. xxvi., fig. 9. 
Luanpovery to Luptow.—Sil., 4th ed., p. 514. This fossil is the princi- 
pal Annelide in the Llandovery rocks, but more frequent in the Wenlock 
and Ludlow rocks. ‘The finest specimens are from the Wenlock lime- 
stone of Ledbury ; but at Dudley, Cornulites are found attached to shells 
in groups of three or four together like Serpule ; and they occur in pro- 
fusion on the hard and sea-worn surfaces of the Ludlow rock at Marloes 
Bay in Pembrokeshire in masses a foot in diameter.” JIbid., p. 233. 
Localities— Wenlock limestone, Malvern Hills; Dudley; and Upper Si- 
lurian rocks, Westmoreland. Brit. Foss., p. 91. 
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