161 
AMMONITES Henleyi. 
TAB. CLXXII. 
1 f 
Spec. Char. Discoid, gibbose, with many small 
radii ; inner volutions exposed ; radii flatted, 
with two compressed tubercles upon each ; 
aperture large, nearly round. 
Between the two concentric rows of tubercles the shell 
is slightly flatted, otherwise the form of the mouth would 
be round, with a small sinus produced by the preceding 
whorl. The whorls are few, and increase rapidly in 
thickness as they proceed towards the mouth. The nu- 
merous radiating ridges are compressed, so as to be as 
wide as the spaces between them, and at the insertion of the 
outer tubercle are commonly split into two, that unite 
on the opposite side : a few of the radii proceed from the 
centre over the front without tubercles. 
Lyme Regis, in Dorsetshire, is a place that has pro- 
duced many fine petrifactions peculiar to the blue Lyas ; 
the present is among the number that have fallen into the 
deserving hands of the Rev. Mr. Buckland. It was found 
upon an estate belonging to H. H. Henley, Esq. of Sand- 
ringham, near Lynn ; in kind remembrance of whom it 
has been named by Mr. Buckland. Its external surface, 
concamerations, anti siphuncle, have not been preserved ; 
the specimen is only a cast in Lyas, with some crystallized 
Iron Pyrites in two or three parts. 
