38 
TROCHUS sulcatus. 
TAB. CCXX. — Fig. 3. 
Syn. T. sulcatus. Miller’s MSS. 
Spec. Char. Conical,, short, whorls convex, finely 
striated, with a sulcus around the middle ; base 
flattish, umbilicate ? 
In the latter turns of the spire, the transverse striae are 
confined to the marginal parts below the furrow ; while 
at the apex they are sharp all over the whorls, and are 
crossed near the superior margin by numerous undula- 
tions : the whole surface is covered by fine lines of 
growth, diverging from the sulcus, which itself is crossed 
by minute striae. The columella being covered by stone, 
the existence of an umbilicus is doubtful, but there are 
some indications of one. 
Preserved in the inferior Oolite of Dun dry : from Mr. 
Miller’s collection. 
