Ill 
ROSTELLARIA composita. 
TAB. DLVIIL— -fig. 2. 
Spec. Char. Turreted, striated ; spire costated ; 
last whorl bicarinated ; lip with but one, cuspi- 
dated lobe, besides the canal at its upper part. 
A small species, distinguished by the costated spire 
and the broadly expanded lip with a spine where the 
upper keel terminates upon its edge. 
We have seen but very imperfect individuals of this 
interesting shell. One (the upper figure), more strongly 
costated than the others, was picked up at Weymouth, 
in the Oxford Clay ; others have been sent us from Scar- 
borough : but the only ones that have the lip preserved 
(see the lower figure) were collected at Brora, in the stone 
immediately above the Coal, by our assiduous friend 
R. I. Murchison, Esq. It is an interesting species, be- 
cause it proves that the genus occurs in a stratum older 
than the Greensand, at the same time that it helps to 
support the parallelism that may be traced between the 
fossil contents of the Greensand and Oxford Clay. 
