LIST OF ENGRAVINGS. 



Page 



Nervous system of MoUusca 4 



Heart of Buccinum undatum 5 



Mantle of Dolium galea 6 



Mouth of lanthina "^ 



Cilia of Buccinum undatum 7 



Foot of a species of Nassa 10 



Mollusk with Shell 10 



Block of Wood covered with Barnacles 1!' 



A Barnacle 20 



Structure of the Barnacle 24 



The Lingula 34 



Terebratula truncata 36 



The Ascidia . 39 



Internal structure of the Ascidia 42 



Botryllus stellaris 45 



Headless Mollusk 60 



The Cable of the Pinna 61 



The Solen 90 



The Mactra .95 



A univalve Shell 103 



Section of a Shell 104 



Arrangement of minute Crystals in a Shell 108 



The Cyprea 109 



The Murex 116 



The Cone . 118 



The Olive Shell 118 



Sections of a Cone 119 



