ON NEW BRACHIOPODA. k13 
surrounded by a well defined internal ridge, which is partly 
obliterated towards the front of the shell; it is there united 
by an elevated septum, oceupying about half the length of 
the shell. 
Obs. This species is the most abundant; it is from the 
inferior oolite of Dundry. I have much pleasure in naming 
it after my kind friend, Mr. Davidson, to whose aid I have 
been indebted in my research into the Brachiopoda, and 
whose beautiful work on them does him so much honour. 
ZELLANIA LABOUCHEREL.— Moore.—Plate 1, fig. 4—5. 
Shell very minute; of an elongated oval shape; front 
rounded; both valves equally convex; foramen large; 
area small; beak slightly produced; exterior of dorsal 
valve smooth, ventral shewing distinet concentric lines of 
growth. 
Obs. This species is readily distinguished from the 
Zel. Davidsonü, by its more oval shape, the absence of 
radiating strie, and by the constant presence of lines of 
growth, which, by the aid of a lens, are perceived on the 
ventral valve only of this species. It is from the inferior 
oolite of Dundry, and is very rare. 
It is named after the respected president of our Taunton 
meeting, the Right Hon. H. Labouchere, M.P. 
ZELLANIA LIASIANA.— Moore. —Plate 1, fig. 6—8. 
Exterior of shell slightly striated, smooth, square ; fora- 
men large, triangular; valves thin and flattened ; ventral 
slightly concave, dorsal slightly convex; interior of dorsal 
valve shewing strongly defined elevated ridges, which, 
commeneing under the cural spurs, are united by a central 
septum. 
1854, PART 11. pP 
