EXPLANATION OF PLATE V. 



Fig. 4. — Dolium maculatum, Desh. Large specimen with persistent juvenile 

 character of the ornamentation. Balasore Bay (Bengal Fisheries 

 M ^P). Natural size. 



,, 5. — Dolium maculatum, Desh. Specimen with adventitious supernumer- 

 ary main rib. (?) Ceylon. Natural size. 



,, 6. — Dolium maculatum, Desh. Specimen with extremely depressed spire. 

 Sandheads. Natural size. 



