9. Mammals _Mammalia_ 8. Birds | _Aves_ | | | 7. Reptiles | _Reptilia_ | 5. Sea-dragons | | _Halisauria_ \-------v--------/ | | Osseous fish | =Amnion Animals= _Teleostei_ 4. Mud-fish | +Amniota+ | _Dipneusta_ | | | | | | | | | 6. Batrachians Ganoid fish | | _Amphibia_ _Ganoidei_ | | | | | | | | \--------------v--------------/ | | | Vertebrate animals breathing through lungs | _Amphipneumones_ | | | | \------------v-----------------/ Primæval fish Selachii 3. Fishes _Pisces_ =Double-nostriled= +Amphirrhina+ | 2. Round-mouthed | _Cyclostoma_ | | | | \--------------------v-------------/ =Single-nostriled= Monorrhina =Animals with skulls= +Craniota+ 1. Tube-hearted | _Leptocardia_ | | | | | \---------v------/ _Ascidiæ_ | Sea-barrels | =Skull-less Animals= _Thaliacea_ | +Acrania+ | | =Vertebrate Animals= | | +Vertebrata+ \----v----/ | | | =Tunicate Animals= | +Tunicata+ | | | | | \-----------v---------/ | Worms _Vermes_
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