PLATE XXIX. 
Zone of Aegoceras arrnatum. 
Aegoceras ARMATUM, /S'o2^jer(5j/. All aged specimen, natural size, showing the large 
' \p ' S ™ dimensions of the spines on the body-chamber and 
• ' the comparative smallness of the spines on the inner 
whorls. This specimen was obtained at Lyme 
Regis thirty years ago, and was long the adorn- 
ment of a private collection. It now belongs to 
the Museum of the Royal School of Mines, and I 
have the pleasure of having it figured for the first 
tiine. 
