TO GEOLOGY. 181 
very much thickened, swollen and projecting about the 
middle ; outer lip sharp. 
Length 2.5, Breadth 1.5, of an inch. 
Observations. This is the largest Anolaz, recent or fossil, 
Ihave seen. It resembles, in its general character, the 
altile and subglobosa (Conrad), and particularly so in the 
great mass of deposit on the inner lip. It differs from them 
in size, and in being more ovate. I have had it im my 
power to examine but a single specimen of this species. 
Other individuals may present different characters. 
A. plicata. Plate 6. Fig. 194. 
Description. Shell subfusiform, turrited, longitudinally 
folded above ; substance of the shell rather thick ; suture 
impressed in the callus, spire elevated, not pointed at the 
apex ; whorls six, flattened above ; mouth ovate, half the 
length of the shell; outer lip sharp. 
Length .4, Breadth .2, of an inch. 
Observations. This species most resembles the scamba 
(Conrad), but is amuch smaller shell, and may at once be 
distinguished by its longitudinal folds. 
Four species of this genus have been observed in the 
London Clay of England. In the Tertiary Tables of M.- 
Deshayes we find nine. Of these five are found in the Paris 
basin. Mr Conrad has observed four from the same stratum 
at Claiborne, whence those above described were taken. 
