Fic. 
3: 
A——6: 
7—11. 
12. 
ile 
14, 15. 
16—20 
21—27 
28—31. 
33—35. 
PLATE X. 
SILURIAN SPEC{(ES. 
Spirifera bijugosa, M‘Coy. Fig. 1, after original figure (‘Synopsis Sil. Foss. Ireland,’ pl. iti, 
9 
> 
” 
fig. 23). Wenlock Shale; Doonquin or Dunquin, County Kerry, Ireland. 
Collection of Sir R. Griffith. Fig. 2, Wenlock beds; Ferriter’s Cove, 
Dingle, County Kerry. Mus. Geol. Survey, Ireland. Figs. 3 and 3a, shell 
accurately restored from several complete valves in the same Collection, 
no perfect bivalve specimen having to my knowledge been hitherto dis- 
covered. 
sulcata, His. (According to Lindstrom, the real Anomia erispa of Linneeus. Mus. Tes., 
pl. v, fig. 7, 1753.) Fig. 4, nat. size. Fig. 4 a, 6, enlarged. Wenlock 
Limestone, Dudley. Fig. 5, a very large example from the same locality. 
Fig. 6, enlarged figure of a less transverse specimen. 
elevata, Dalman. Figs. 7, 8, Wenlock Limestone, Dudley. Fig. 9, Upper Llan- 
dovery beds, Damory Bridge, Tortworth. Fig. 10, Lower Ludlow, Crews 
Mill, Alfrick. Fig. 11, Wenlock Limestone, Wenlock Edge. (This last 
specimen seems intermediate in shape between the true Sp. elevata and Sp. 
crispa of Hisinger.) Figs. 9—11, Mus. Geol. Survey, London. 
crispa (Anomia crispa), Linneus. After the original figure Mus. Tess., pl. v, fig. 7, 
1837, and so named in the ‘Systema Nature.’ (Although this figure is 
not good, it is here reproduced that the student may know what was the 
original figured form of Anomia crispa.) Wenlock Limestone, Gothland. 
,  (Delthyris crispus, Hisinger). After the original figure, ‘ Lethzea Suecica,’ 
pl. xxi, fig. 5. Wenlock Limestone, Gothland. (This also is here given 
for the sake of reference, as it is believed by some palontologists 
that the Anomia crispa, Linneus, and Delthyris crispus, His., belong to 
distinct species.) 
» His. Fig. 14, Wenlock Limestone, Rock Farm, May Hill. Mus. Geol. Survey, 
London. Fig. 14 @ enlarged. Fig. 15, Wenlock Limestone, Dudley. 
. Nucleospira pisum (Sp. pisum), Sow. Fig. 16, after original figure (‘Sil. Syst.,’ pl. xiii, fig. 9); 
Wenlock Limestone, May Hill, near Walsall. Fig. 17, a large example 
(without spines), W. L., Benthall Edge. Fig. 17 a, 6, c, enlarged figures. 
Figs. 18, 19, from same locality, showing the spiral coils, through the _ 
transparency of the fossil shell. Fig. 18a, enlarged. Fig. 20, a specimen 
still preserving almost all its spiny investments; from the Wenlock Lime- 
stone of Colwall Copse. Collection of Dr. Holl; similar examples occur 
in the Worcester Nat. Hist. Museum. 
. Meristella angustifrons (Hemithyris), M‘Coy. Fig. 21, after original figure (‘ Brit. Pal. Foss., 
pl. i H, fig. 5), from the Caradoc Sandstone at Dalquorhan, Ayrshire. 
Figs. 22—24, Caradoc beds; Penhill and Mullock Hill, Ayrshire. Fig. 25 a, 
specimen showing portions of spiral coils; same locality. Figs. 26, 27, 
internal casts ; Girvan Valley, Ayrshire. Figs. 26 a, 6, enlarged figures. 
leviuscula (Terebratula), Sow. =(Atrypa nitida, Hall.) Fig. 28, Wenlock Limestone, 
Dudley. Mus. Geol. Survey, London. Fig.29,same locality. Fig. 30, Wen- 
lock Shale; Rushall Canal, near Walsall. Fig. 31, a specimen showing 
traces of internal spiral coils. Fig. 31, after the original figure of 7. 
leviuscula, Sow. (‘Sil. Syst.,’ pl. xiii, fig. 14.) Wenlock Shale, Tyne- 
wydd, Llandovery. Mus. Geol. Soc. 
Circe, Barrande. Fig. 33, from Wenlock Limestone, Dudley. Fig. 34, Woolhope 
Limestone, Eastnor Park, Malvern. Collection of Dr. Holl. Fig. 35, 
specimen showing portions of spiral coils, Dudley. 
