viii List of Woodcuts. 



PAGE 



Section through Gorner Grat 535 



Contortions of Slaty Serpentine 536 



Section of Slaty Serpentine 537 



Nautilus elegans, Sby 548 



■ elegantoides, d'Orbigny • 549 



pseudoelegans, d'Orbigny 551 



Iridina oblonga, Mararaura, Lake Nyassa, Central Africa 557 



Cyrena neglecta, Kat Eiver, South Africa 558 



