101 
* 
CARDIUM striatulum. 
TAB. DLIII.—ig. 1. 
Spec. Cuar. Orbicular, convex, concentrically 
striated ; posterior side longitudinally striated 
with a toothed edge. 
Srronezy resembling Cardium Hillanum, tab. 14, 
but it is more perfectly orbicular ; the transverse striz 
are less regular, and the longitudinal ones twice as nume- 
rous as the angular sulci which occupy a similar situ- 
ation in the Hillanum: 
This Cardium accompanies the Sanguinolaria undu- 
lata (tab. 548), &c. in the argillaceous and at the same 
time areniferous Limestone next above the coal at Brora, 
where it was collected by R. I. Murchison, Esq. in the 
reef opposite the Old Salt Pans (see the larger figure) ; 
the smaller figure is from a specimen preserved by 
Mr. Farey,—it is accompanied by another species. 
— Er 
CARDIUM dissimile. 
TAB. DLIII.—/g. 2. 
Spec. Cuar. Transversely obovate, gibbose, smooth ; 
posterior side bounded by a small rib, longi- 
tudinally striated ; front rather straight. 
A smootu shell, so much resembling several species of 
Venus, that it has been referred to that genus: it is very 
thick every where except near the beaks: the length is 
a little less than the width. 
Very frequent in the Portland Limestone. We have 
specimens from Portland, Purbeck, and Tisbury. 
