n 
UPPER TRIASj 
SPIRIFER OLDHAMI.-iV. Sp. 
Plate 9, fig. 12. 
A globular species, 7 lines long, wide, and about as 
deep, with the valves united as they are in our solitary decor¬ 
ticated specimen. 
The species belongs to the group of short-hinged and broad- 
plaited Spirifers, familiar to us in the Lias. S. r os trains is 
the nearest British type. The beak is blunt and projecting, 
and somewhat incurved ; the area small and short; the sides 
very steep. The larger valve has a shallow sinus, and traces 
of about three blunt ribs on each side. The dorsal valve has 
a blunt, distinct convex fold, and about three ribs on either 
side, but they do not reach the margin, which, in this old 
specimen, has coarse antiquated ridges of growth. There are 
several concentric ridges over the body of the shell, as seen in 
our fig. 12 b. 
SPIRIFER STRACHEYI .—N. Sp. 
Plate 9, fig. 13. 
A wider shell than our Lias Spirifer, S. Walcolii , with a 
wider area, and more of a carboniferous aspect. 
We have three specimens. The largest is one inch wide, 
and half an inch high, while the depth of the valves united 
is scarcely half an inch. 
The beak is very little incurved, overhanging a large and 
wide concave area, and the larger valve has a broad, deep 
sinus, with angular ribs bounding it, but none on the sinus. 
Five distinct and rather prominent ribs occur on each side, 
the pointed angles being destitute of ribs (fig. b ). The other 
valve (fig. a) has a corresponding broad smooth fold, rather 
convex, and distinctly bounded by furrows. It increases rapid¬ 
ly in size, from the beak to the front margin, so that the side 
ribs, six on each flank, appear to diverge widely. 
A few rugae of growth occur at regular intervals, crossing 
these ribs, and the margin is antiquated by them. We have 
