SOS 
AMMONITES Brooki*. 
TAB. CXC. 
Spec. Char. Depressed, carinated, with a sulcus 
on each side of the keel ; radiated ; radii 
strong, simple, arched ; inner volutions ex- 
posed ; aperture oblong. 
A. boldly marked shell, with four or five whorls, of 
which the inner ones are more than half exposed ; the 
radii are large and prominent, equally broad with the 
spaces between them ; each is composed of a single arch 
bent forwards ; the keel is round and entire, with a deep 
furrow on each side of it. The surface of the shell is 
finely marked with lines of growth. The length of the 
aperture is about one-third the longest diameter. 
From the Blue Lyas of Lyme Regis, Dorset, favoured 
me by the Rev. W. Buckland. I have named this after 
H. J. Brooke, Esq. M.G.S. a gentleman well versed in 
Geology and Mineralogy. 
