ON NEW BRACHIOPODA. 10%, 
a bridge over the visceral cavity; within this ridge is a 
smooth slightly coneave space, between which and the 
granulated interior is a small granulated ridge. 
Obs. This species has been figured by Mr. Davidson 
and M. Eugene Deslongchamps, but from more imperfeet 
specimens. No examples have before been obtained so 
perfect as those now figured; which is due to my being 
successful in opening several bivalve specimens. In the 
detached and worn valves, the septum is less deep, and the 
granulations to some extent obliterated. 
From the inferior oolite of Dundry, where it is common. 
It is also found in the upper and middle lias. 
THECIDEUM GRANULOSUM.— Moore. —Plate 2, fig. 1—6. 
Shell thick, longitudinally oval; area triangular, concave; 
deltideum flattened; hinge line straight; outer side of 
dorsal valve convex, having lines of growth and short strise 
towards the frontal margin, ventral valve having a sinus in 
the centre. Interior of ventral valve has a central ridge 
through its greater length, on each side of which are 
muscular impressions. The interior of dorsal valve has a 
flattened thickly granulated margin, within which is a 
raised ridge, formed of larger single granulations, united in 
the centre by a septum occupying about one-half the length 
of the shell, sometimes smooth, at others covered with 
granulations, and joined over the visceral cavity by a bridge, 
the equivalent of the cural processes of Terebratula; 
within this ridge occurs a small raised ridge, answering to 
the loop in other Brachiopoda to which were attached the 
brachial membrane and oral arms, within which, and 
oceupying the larger portion of the cavity of the shell, 
oceurs a caleified supra-membraneal disk, divided by the 
