PLATE VIII. 
SILURIAN SPECIES. 
1. Siphonotreta Anglica, Morris. Original figure (‘Annals and Mag. of Nat. Hist.,’ 2nd ser., vol. iv, 
pl. vii, fig. 1. Fig. 1, shell natural size; a, magnified view ; 4, outer surface 
magnified ; ce, spine enlarged. Wenlock shale, Dudley. Collection of Mr. 
J. Gray. 
2—6. 5 micula, M‘Coy. Fig. 2, original figure (‘British Pal. Foss.,’ pl. i u, fig. 3), natural 
size; 2a, enlarged. Llandeilo flags, near Builth. Woodwardian Museum, 
Cambridge ; Fig. 3, natural size; 3a, enlarged. Llandeilo flags, Wye Ford, 
Builth. Mus. Geol. Survey, London. Fig. 4, Glenkiln, Dumfriesshire ; Lilan- 
deilo flags. Mus. Geol. Surv., London. Fig. 5, Builth. Collection of Mr. 
Morton. Fig. 6, Balcletchie, Ayrshire. 
7—12. Crania divaricata (Pseudocrania) M‘Coy. Fig. 7, internal cast of ventral valve, after original 
figure (‘ Brit. Pal. Foss.,’ pl.i u, fig. 2); from the Upper Bala Rocks of Bryn 
Melyn Quarry, Bala. Woodwardian Museum, Cambridge. Fig. 8, exterior, 
op. cit., pl. i #, fig. 1. Fig. 9, internal cast of ventral valve, natural size ; from 
Caradoc beds, Penny Park, near Llanfyllin, Montgomeryshire. Collection 
of Mr. W. Prosser. Fig. 9a, enlarged, gutta-percha mould from cast, showing 
the interior of ventral valve, its muscular and other impressions. Fig. 10 a, 
exterior of one valve, enlarged; Caradoc beds, Chair of Kildare, Ireland. 
Fig. 11, internal cast of dorsal valve, with muscular impressions ; a, occlusor; 
/, dorsal adjustor; 7, divaricator; m, mesenteric; , brachial (anterior ex- 
tremities) : fig. 11 a, the same enlarged. Figs. 12 and 12 a, an enlarged 
interior of valve, taken from a gutta-percha mould made from internal 
cast, fig. lla; Chair of Kildare. Mus. Geol. Survey, London. 
13—17.  ,, ¢wmplicata (Patella), Sow.’ Fig. 13, after the original figure., ‘Sil. Syst.,’ pl. xiv, fig. 12; 
Wenlock limestone, Abberley. Mus. Geol. Soc., London. Fig. 14, natural size, 
Wenlock limestone, Rock Farm, May Hill. Fig. 14 a, 6, the two valves enlarged; 
c, profile view of both valves. Fig. 15, interior of ventral valve enlarged ; 
same locality. Fig. 16, slab covered with small internal casts, Upper Ludlow 
beds, Newton Lane, Bradna Hill. Geol. Mus. Survey, London. Fig. 16a, one 
of these casts enlarged. Fig. 17, Upper Llandovery, Mandinan, Llandovery ; 
same museum. 
18. »» ! Upper Ludlow beds, Pentland Hills. Collection of Mr. D. J. Brown. 
19, 20. »  Stluriana, Dav. Fig. 19, two exteriors on a specimen of Leptena Walton, from Wen- 
lock shale, Falfield. Fig. 20, interior of one of the valves. 
Die » ! Species undetermined. One specimen from Caradoc sandstone, Gretton, Salop. Collection 
of Mr. Wyatt-Edgell. 
22—24, ,, ? Grayii, Dav. Fig. 22, five exteriors of upper valve, attached to a specimen of Spirifera 
plicatella, var. radiata, from Wenlock limestone, Rushall Canal. British 
Museum. Fig. 23, a large example, and fig. 24a, enlarged figure ; from 
Wenlock limestone, Dudley. Collection of Mr. L. P. Capewell. 
? Sedgwicki, Lewis. (Genus undetermined, and no longer considered even a Brachiopod. 
Might it be referable to some Coral?) The original specimen; Wenlock 
limestone, Rushall Canal, near Walsall. Mus. Geol. Survey, London. Fig. 
25 a, inner surface enlarged. 
26, 27. Spondylolobus craniolaris, M‘Coy. After original figures (‘ Brit. Pal. Foss.,’ pl. i H, figs. 4 and 
5); and explained as follows :—Fig. 26, exterior. Fig. 27, group of three 
casts of inner surface of large valve, natural size, from the black shale of 
Builth Bridge. Fig. 14 c, wax cast from one of ditto, showing the appear- 
ance of the shell magnified. (This fossil will hereafter be referred to and 
explained.) ; 
28. Goniophyllum pyramidale (Turbinolia), Hisinger. Wenlock shale, Dudley. Collection of Mr. L. 
P. Capewell. This is the first British specimen of the species hitherto 
discovered, and is here figured because the fossil had, by Girard (Leonh. 
und Bronn’s ‘Jahrbuch, 1843, p. 232), been considered to be a Ca/ceola ; 
a view subsequently rejected by Milne-Edwards, J. Haime, and Lindstrém ; 
the genus Ca/ceola itself is no longer classed amongst the Brachiopoda. 
bo 
or 
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. 
1 While describing this species (in a footnote) I mentioned that Prof. Hall had, in 1859, proposed the generic designation 
of Pholidops for shells agreeing with Patella implicata, Sow.; but I omitted to observe that should these free or unattached 
species of Crania require to be classed under a separate generic designation, that the term Pseudocrania, proposed by M‘Coy in 
1851, would claim priority. 
