101 
CARDIUM striatulum. 
TAB. DLIII.— /g. 1. 
Spec. Char. Orbicular,, convex., concentrically 
striated ; posterior side longitudinally striated 
with a toothed edge. 
Strongly resembling Cardium Hillanum, tab. 14, 
but it is more perfectly orbicular ; the transverse striae 
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 w r as collected by R. I. Murchison, Esq. in the 
reef opposite the Old Salt Pans (seq the larger figure) ; 
the smaller figure is from a specimen preserved by 
Mr. Farey, — it is accompanied by another species. 
CARDIUM dissimile. 
TAB. DLIIL— ^g. 2. 
Spec. Char. Transversely obovate, gibbose, smooth ; 
posterior side bounded by a small rib, longi- 
tudinally striated ; front rather straight. 
A smooth 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. 
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