PLATE IV. 



Fig. Page. 



1. Macrocephalites macrocephalus (Schloth.) ; adult. — Bedford. In the 



British Museum (no. C. 5072), no. 28, enumerated in Table I. 43 



2. Macrocephalites herveyi (Sowerby). — Peterborough. In the Museum of 



Practical Geology (no. 8650). 46 



3. Macrocephalites Imdlestoni, sp. nov. — Rushden. In the Collection of 



Mr. W. H. Hudleston. 3 a, side view ; 3 b, peripheral view. 47 



4. Macrocephalites compressus (Quenstedt). — Garsdon, near Malmesbury. 



In the British Museum (no. 8321). 4 a, inner part enclosed in a 

 later whorl, showing sutures ; 4 b, peripheral view. 45 



5. Macrocephalites typicus, nom. nov. — Scarborough. In the Author's 



Collection. The smallest specimen seen, ba, side view; 5 b, peri- 

 pheral view. 42 



