82 
PECTEN vagans. 
TAB. DXLIIIl.—figs. 3, 4, & 5. 
Spec. Cuar. Rather convex, a little longer than 
wide ; ribs 11, large, convex, decorated with 
large erect concave scales that are very close 
upon the right but distant upon the left valve ; 
ears nearly equal, crossed by large scales. 
Syn. P. sulcatus. Geol. Survey of the Yorkshire 
Coast, p. 233. t. 9. fig. 3. excl. Syn. 
Sezpom above an inch and a quarter wide. It differs 
from the last by having only half the number of ribs, 
and in not having the regular concentric striae which 
appear between the ribs in that. When young the 
ribs are buta little raised, although the scales are then 
large: a few obscure rays sometimes appear between 
the ribs. 
This is one of those few shells which occur in several 
strata: it is found in Clay belonging to the Oolite near 
Bath (fig. 5.); in the Bath or Great Oolite at Hampton, 
Gloucestershire, and Bradford, Wiltshire; above the 
Oolite at Ancliffe; in the Cornbrash at Chatley (figs. 
3, & 4.), and in the Oolite Limestone at Malton. 
