28 
DEVONIAN FAUNA. 
Description. — " Deltoidal ; anteriorly gibbous, rounded, with a contracted, 
subconcave, cordiform space around the umbo ; posteriorly elongated, conoidal ; 
beaks anterior, surface radiated with many equal ribs, except on the cordiform 
anterior space, where they are much finer than on the other part, and are 
distinctly cut off by the carina which bounds the depression" (Phillips's 
'Pal. Foss.'). 
Localities. — " Bradley ; " " Halberton, north-east of Tiverton." 
Bemarhs. — I have met with no shell agreeing with this form, and consequently 
can form no judgment as to its specific value. It probably came from the 
Wolborough Quarry, as the name " Bradley" seems to have been formerly used 
for that place, which is not far from the grounds of Bradley House. 
Judging from the figure given in the ' Pal. Foss.,' it is widely different 
from G. clathratum and the other accompanying forms. It seems distinguished 
by its small and concave anterior cordiform slope, by its broad median region 
covered by about twelve ribs, by the very large ribs on its posterior wing, 
and by its transverseness. 
It appears to be identical with the shell described as G. aliforme by Sowerby 
in the ' Geol. Trans.,' but not with the original G. aliforme of the ' Min. Conch.' 
Phillips identifies it with G. aliforme, var. y, Groldfuss ;^ but it appears to me 
that that Carboniferous species is much shorter, and that the ribs on its cordiform 
slope, which is much larger, are very much more numerous. 
D'Orbigny re-names the species, as he considers it distinct from Phillips's 
original Yorkshire shell.^ An examination of Carboniferous specimens in the 
British Museum makes me think that he is certainly correct in this. 
6. CoNOCAEDiUM ViLLMAEENSB, d'Archiac and de Verneuil, sp. PL II, figs. 8, 
8 a — c, 9. 
1842. Caeditjm Vili,maeense, d'Archiac and de Verneuil. Greol. Trans., ser. 2, 
vol. vi, pt. 2, p. 375, pi. xxxvi, figs. 9, 9 a, 9 i, 
10, 10 a. 
1849. CoNOCAEDiUM ViLLMAEENSE, d'Orbigny. Prodrome, vol. i, p. 80. 
1853. Caeditjm beetialatum, Sandherger. Verst. Ehein. Nassau, p. 258, pi. xxvii, 
figs. 7, 1 a,'7h. 
1881. CoNocAEDiUM EAEUM, Barrande. Syst. Sil. Boh^me, vol. vi, pi. cxcv, 
figs. 2, 1-10, Et. F. 
1889. Pleueoehynchus Villmaeense, WUdhorne. (reol. Mag., dec. 3, vol. vi, 
p. 79. 
^ 1834-40, Goldfuss, ' Petref. Germ.,' vol. ii, p. 213, pi. cxlii, figs. Ih, i (only). 
2 1836, Phillips, ' Geol. Yorks.,' vol. ii, p. 210, pi. v, fig. 27. 
