ON NEW BRACHIOPODA. 119 
Obs. The interior of the dorsal valve of this species is 
very variable; in some instances the internal ridges are 
formed by widely-separated granulations, of which fig. \2 ıs 
an extreme variety; in others they are continuous, as in 
fig. 11. Fig. 9 is drawn from a specimen I was successful 
in opening, but does not give a faithful representation of 
the spinose character of the ridges, which were acci- 
dentally broken before the drawing was made. 
From the inferior oolite of Dundry. 
THECIDEUM SEPTATUM.— Moore.—Plate 2, fig. 13—16. 
Shell small, thick, transversely oval; area flattened; 
deltideum small, depressed; hinge line straight, exterior 
ofthe dorsal valve convex. Interior of the dorsal valve 
shews a raised septum or ridge, from which, in the middle, 
spring lateral branches, assuming the form of a letter Y; 
these traverse the length of the shell, and occasionally 
divide it into three nearly equal parts; outer margin small, 
and slishtly granulated, within which is a granulated ridge. 
The interior of the ventral valve has a slightly raised 
central ridge. 
This species is rare. It is from the inferior oolite, 
Dundry. 
THECIDEUM SERRATUM.— Moore. —Plate 3, fig. 1—6. 
Shell inequivalve, triangular, very small; attached to 
other bodies by the whole of the ventral valve, and by an 
expanded base; area flattened; deltideum very long, 
rounded, shewing lines of growth. Exterior of dorsal 
valve flattened, or slightly convex, rather more than half 
the length of the whole shell. External front of the 
ventral valve very raised, shewing punetuations, sometimes 
