220 
CARDITA? lirata. 
TAB CXCVILI.--- Fig. 3. 
Spec. Cuan. Transversely oblong, gibbose, with 
9 or 10 longitudinal tuberculated ridges ; the 
ridge separating the posterior side is much the 
highest. 
Tue posterior side is well defined by a large ridge ; it is 
convex, and has two or three tuberculated ridges pass- 
ing over it; the anterior side is not so plain as in either 
of the other species upon this plate; the length is twice 
the width. 
Occurs in the Lyas near Bath, from whence it was 
sent me by the Rev. H. Steinhauer, and also in the Corn- 
brash, as I learn from a mutilaied specimen. On the 
Lyas specimen, part of the surface, formerly occupied by 
the shell, is now covered with a coat of calcarious spar, 
which shews that the shell was very thin. 
CARDITA ? deltoidea. 
TAB. CXCVII.---Fig. 4. 
Spec. Cuar. Very gibbose, obtusely triangular, 
with 8 or 9 longitudinal rugged ridges ; ante- 
rior side pointed. 
Tue ridges are largest near the posterior part; they 
are very irregularly tuberculated: the beaks being promi- 
nent, and the anterior side pointed, give the triangular 
contour. 
