08 
THE GEOLOGIST. 
Dundry, which have furnished me with so many new forms of Bra- 
chiopoda. The upper valve only is known. 
Crania Saundersii. Moore. PI. ii., figs. 11, 12. 
Shell rounded ; exterior of the valve flattened, or slightly convex ; 
surface wrinkled; shell- structure smooth. The interior of the valve 
shows four muscular impressions ; the upper pair being rounded and 
depressed, the anterior, occupying the middle of the valve, are raised 
and prominent, ear-shaped, and curved outwardly. 
Qls. — By its exterior it would be difficult to distinguish this shell 
from the C. antiquior of the Great Oolite of Hampton Chffs, but the 
interior of the valves differ. In the G. Saundersii the two pairs of 
muscular impressions are more widely separated, the lower pair 
being much stronger, and in shape different from those of the C. an- 
tiquior, and there is also the absence beneath them of a longitudinal 
ridge usually present in the latter shell. 
It is from the Inferior Oolite of Dundry, near Bristol. I have 
much pleasure in naming it after Wm. Saunders, Esq., of Clifton, to 
whom the Museum of the Bristol Philosophical Institution is so 
much indebted. The shell also occurs in the Inferior Oolite of Min- 
chinhampton, Gloucestershire. 
Crania Ponsortii. Eng. Deslongchamps. PI. ii., figs. 9, 10. 
The shell described under the above specific name was found by 
M. Deslongchamps in the Great Oohte of St. Aubin. It occurs in 
the coralline beds of Hampton Cliffs, and with it the Crania antiquior 
of Jelly is found in great numbers. The outer surface of the latter 
shell is characterized by possessing a somewhat rugose, or wrinkled 
surface, and the interior by its well defined muscular impressions, 
which always occupy the same position in the species, and give pretty 
uniformly the same pattern to the interior. The interior of C. Pon- 
sortii appears to be un distinguishable from it, the chief difference 
being in their outer surfaces. This, in the G. Ponsortii, possesses pli- 
cations which give it a shghtly spinose aspect. After examining 
many examples of the C. antiquior, I have observed in some of them 
a tendency to become more rugose, and to pass gradually into the 
form represented by the above shell, and I am therefore disposed to 
consider it only a variety of C. antiquior. 
DisciNA. Lamarck. 
Biscina Bundriensis. Moore. PI. ii., fio-. 15. 
Shell smaU, thick, broader than long, flattened, apex smooth, 
elevated ; exterior showing narrow bands of concentric Hnes of growth, 
which are slightly plicated, giving to the shell a wrinkled surface. 
It is from the Inferior Oolite of Dundry, and is the only species 
known in that formation. It appears to be rare ; for after a 
lengthened examination of these beds, I have only succeeded in ob- 
taining thi'ee specimens. 
