47 
LUTRARIA lirata. 
TAB. CCXXV. 
Spec. Char. Transversely elongated, recurved, 
gibbose, with numerous obliquely longitudinal 
ridges. 
V ery much elongated transversely, being nearly three 
times as wide as long; the anterior side is nearly smooth, 
and rather compressed ; the rest of the surface is almost 
covered by sharp ridges that diverge from the beaks * 
the front and back are parallel, the back being recurved. 
Found in Limestone at Norton-under-Edge, from 
whence T. Meade, Esq. has sent it me. 
LUTRARIA ovalis. 
TAB. CCXXVI. 
Spec. Char. Transverse, elongated, elliptical, 
straight, convex, with about 9 diverging ridges. 
A rather gibbose inequilateral shell, with the curva- 
ture of the front and back nearly equal ; the sides 
rounded, and very little open ; the posterior side is 
much the smallest, and has only one or two radii upon 
it ; the anterior side is not curved as in the following 
analogous shells. 
I have figured two casts apparently agreeing precisely 
in form. Fig. 1 is from Felmarsham, communicated by 
the Rev. T. O. Marsh. The other is from Portland ; it 
has a partial coating of calcareous spar, indicating a 
thick shell. 
