PAGli 
Development = 2215 
General 
Oogenesis and Ovum 
Spermatogenesis and Spermatozoon • 
Embryology 
Ethology = 2219 : — 
General 
Movements, Locomotion ... 
Enemies, Defence and Protection 
Feeding Habits 
Breeding Habits ... 
Coloration ... 
Habitat ... ... 
Boring and Burrowing Habits ... 
Acclimatisation, etc. 
Hibernation and ^Estivation 
Parasitism, Commensalism, Parasites, etc. 
Evolution 
Sexual Dimorphism 
Economics ... 
>26 
Variation and ^Etiology = 2223 : — 
General Treatises ... ... ... ... ... 
Teratology, Phylogeny and Relationship ... ... >27 
Evolution ... ... ... ... ... ... ...J 
Distribution = 2227 : — 
General 
27 
(a) 
Recent : — 
(a) Marine : — 
Arctic Ocean ... 
North Atlantic Ocean, Caribbean Sea and 
Gulf of Mexico 
Mediterranean Sea, Black Sea 
South Atlantic Ocean... 
Indian Ocean, Red Sea 
Malaysia 
Pacific Ocean ... 
Southern Ocean 
Antarctic Ocean ... 
y2? 
