PLATE LVI. 
Humphriesiaiium-zone. 
Fig. 1. DOTISETENSIA LIOSTRACA, ;S'. BuchmaU. 
Fig. 1. — Side view of a variety with obscure costse, and an expansion of the 
umbilicus, although no part of the body-chamber is present. Oborne. My 
Collection. (Page 310.) 
Figs. 2 — 5. — DoRSETBNSiA TECTA, S. Buckman. 
Fig. 2. — Side view. The hollow carina is broken away, and only parts of the 
injSlling remain at c. Oborne. My Collection. (Page 311.) 
Fig. 3. — Front view of the same specimen showing the thickness. 
Fig. 4. — Suture-lines of the same example. 
Fig. 5. — Side view of a specimen with a rather smaller umbilicus. Oborne. 
My Collection. 
