129 
HELICINA expansa. 
TAB. CCLXXIII. — Figs. 1, 2, and 3. 
Spec. Char. Carinated ; above, depressed, coni- 
cal, obscurely striated ; beneath, ventricose ; 
callus expanded. 
A nearly smooth shell, the whorls of which are flat 
above, but very gibbose below an obtuse distinct Ca- 
rina. The callus which terminates the columella is 
considerably expanded over the base of the shell; 
aperture quadrangular. 
Found in the Blue Lyas of Lyme in Dorsetshire : it 
seems to be a rare species, as Mr. De la Beche, to 
whom I am indebted for the use of the specimen figured, 
has but one individual : it is in good preservation, in an 
indurated Marie, which fills it, but does not adhere 
strongly to the surface : the shell is converted into cal- 
carious spar. 
HELICINA solarioides. 
TAB. CCLXXIII. — Fig. 4. 
Spec. Char. Subdiscoid, obtusely carinated ; 
whorls depressed above, convex beneath. 
This is very similar to the last, but is a much shorter 
shell : the callus is less spread and more convex, and 
the carina not so distinct : it is also obscurely striated. 
Is it possible that this is the young of the preceding ? 
Its carina being more obtuse rather militates against 
that idea. I know not what part of England it was 
found in : it is in a similar Marie with the preceding. 
