136 
Case and 
Column of 
Drawers. 
Reference to McCoy’s 
Synopsis : and Figures of Genera. 
SILURIAN. 

Names and References; Observations, &c. 

Numbers and Localities. 

Gc% 




p. 190. 




Siphonotreta anglica, Morris (Ann. Nat. Hist. 
2 ser. Vol. 4, tab. 7, fig. 1. Davidson, Sil. 
Brach. p. 75, t. 8, fig. 1. Siluria, 3rd ed. 
Foss. 58, fig. 10). 
[The genus Siphonotreta was established in 
1845 by M. de Verneuil, for certain Bra- 
chiopod shells having well-defined characters 
which separate it from Crania and Terebra- 
tula. There are two British species. Editor.] 
Discina (Orbdicula of old writers). Also a very 
old genus indeed. Under slight modifica- 
tions it persists from Cambrian, even Lower 
Cambrian times, to the present day. And 
like Crania is a deep water form. The 
valves slide one on the other by the action 
of the muscles, and the byssus comes out 
of a subcentral foramen in the lower (ven- 
tral) valve. 
Discina Verneuilii, Davidson (Sil. Brach. pl. 6, 
fig. 5). 
Discina striata, Dav. (Sil. Brach. p. 191, pl. 6, 
figs. 1—4, Siluria, pl. 20, fig. 3). 
Discina Morrisii, Davidson (Sil. Brach. pl. 7, 
figs. 10—12). It differs in its smooth shining 
surface from the D. Forbesii. 
Discina Forbesii, Davidson (Siluria, Foss. 57, 
fig. 11, p. 250, Mem. Geol. Surv. Vol. 11. pt. 1, 
p. 371, pl. 26, fig. 2. Davidson, Sil. Brach. 
pl. 7, figs. 14—18). Both valves equally or 
nearly equally convex, forming the genus 
Orbiculoidea, of D’Orbigny. 
Discina, sp. 
Lingula, Bruguiére. The earliest known, and 
most common of all the Brachiopod group. 
Its structure has been described well by 
Dr Woodward in his Manual, and very 
wrongly referred by Prof. McCoy to the 


Dudley. 
a. 712, Dudley, F.C.; an 
inch long. Good specimen 
in Sharpe’s cabinet, Geol. 
Society. 
a. 711, Dudley, F.C, 
Lower Ludlow ? 
a. 718*, Dudley, F. C. 
a. 718, a.719, Dudley, F.C.; 
a, 383, Keeper’s Lodge, 
Golden Grove, W. Shale. 
