PLATE XXXIII. 
Zone of Aegoceras Henleyi. 
Fig. 1. Aegoceras Henleyi, Soiverbi/. Lateral view of a perfect specimen, showing 
the change of form which took place in 
middle-age period of this remarkable 
species. 
, 2. — — — Front view of the same shell. 
3. — — — Siphonal area of the same shell. 
The outer whorl of this fossil is the true ^w^»^o^^^Yes Henleyi, Sow., ' Min. Conchology,' 
pi. clxxii, and the inner whorls here in situ in this rare specimen are clearly the 
Ammonites latecosta, Sow., 'Min. Conchology,' pi. dlvi, fig. 2. This specimen I 
obtained several years ago from the green Ammonite bed, near Charmouth, Dorsetshire 
and since I have had three other less perfect specimens from the same stratum, all, how- 
ever, show the same anatomical characters which are so well displayed in the beautiful 
drawing Mr. Gawan has given of this Ammonite. 
8P 
