78 
AYICULA inequivalvis. 
TAB. CCXLIV,— Fig. 2. 
Spec. Char. Oblique,, elliptical, convex,, with a 
large projecting ear, covered with radiating 
striae and many thin costae ; flatter valve con- 
vex, smooth, marked with diverging sulci, in- 
cluded within the deepest valve. 
Tar. a, striae slender. 
Tar. (3 y striae strong. 
The margin of the deeper valve of this very thin shell 
extends far beyond that of the other valve, which ap- 
pears as if pressed into its cavity ; but as there is no 
visible fracture this can hardly be the case. The poste - 
rior ears are very small ; the radi are about fourteen in 
number, very neatly continued on to the beak ; those of 
the larger valve are elevated ribs ; but on the other side 
they are shallow sulci : the space between the radii is 
finely striated in the larger valve, but smooth in the 
other ; the coarseness of these strise in var. £ is all the 
difference I have found in it from var. a.. Yar. <x is found 
in the Kelloway’s rock ; the upper specimens figured are 
from a large mass, found at Dursley, kindly lent me by 
Mr. Parkinson ; the other figure is from part of a spe- 
cimen in a decomposing state ; for this I am indebted to 
T. Meade, Esq. who collected it near Kelloway’s Bridge. 
Of var. /3 I have a number of imperfect valves, along 
with pentacrini upon the surface of a mass of Lyas, from 
Fretbern, in Gloucestershire, and a single valve upon 
the same kind of stone from Kelweston, by favour of the 
Rev. H. Steinhauer. Of this variety I have not met 
with the lesser valve. 
