64 
ANCYLUS elegans. 
TAB. DXXXIII. 
Spec. Cuar. Convex, subconical ; aperture longi- 
tudinally obovate ; apex oblique, eccentric, 
near the narrowest part of the aperture. 
eee 
Tue aperture is exactly intermediate in form between 
that of the two recent species. Considering the aper- 
ture as the base, it is narrowest towards the back: the 
apex is far from central, and is bent down towards one 
side. Witha high power, minute strie are seen de- 
scending from the apex; the height is nearly equal to 
half the greatest diameter of the aperture. 
Found along with Mya subangulata (probably only a 
young state of M. plana), Melanopsis brevis, tab. 523, 
and Paludina lenta, tab. 31, in a dark gray Sand imme- 
diately under the white Sand at Hordwell, in which My- - 
tilus Brardii occurs. Weare indebted to the generosity 
of Charles Lyell, Esq., jun. for the specimens ; no one 
else appears to have found it. 
