110 
THE GEOLOGIST. 
Plagiostoma ovalisj oolite. 
These shells are found occasionally in two or three 
of tlie oolitic beds. 
gigantea, lower lias and oolite. 
ohscura, Stonesfield slate. 
IcBviusculum, oolite. 
Pecfen equivalvisj marlstone. This shell marks the lias marl- 
stone all through this district. 
vimeneus^ oolite. 
vaganSj Stonesfield slate. 
duplicatuSj marlstone. Found in the yellow lias_, and 
also the lower blue clays ; remarkable for having 
its two sides differently marked. 
lens, Stonesfield slate. 
Trigonia costata, oolite. 
clavellata, oolite. 
These two shells are constantly found in the infe- 
rior oolite, in some of the beds of which are 
found thousands of their remains. 
Terehratula concinna, oolite. 
acuta, marlstone and oolite. 
glohata, oolite. 
perovalis, oolite. 
maxilata, oolite. 
biplicata, oolite. 
angulata, oolite. 
flabellula, oolite. 
fimbria, oolite, 
obsoleta, oolite. 
media, oolite. 
tetahedra, marlstone, very common.— 
These Terebratulse, with many unnamed species^ 
are found scattered through the oolite beds j in 
