viii 



LIST OF PLATES. 



PLATE X. 



No. PAGE 



1. A group of Serpula contor-)^^ m • x t ci i 



^ ^ ^ [The Twisted Serpula ... 87 



tupUcata 



^ , ^. . . . (The Thick-horned Sea-Ane-) 



2. AeUma crassicorms . . .] [57 



( mone j 



PLATE XI. 



A Design for a Plainly-mounted Aquarium 34 



PLATE XII. 



A Design for an Aquarium mounted in handsome Eustic-work 34 



