MAMMALIA (_Mammals_). Aves (_Birds_). | | | Reptilia (_Reptiles_). | | | +---------------+---------+ | Teleostei Halisauria | (_Osseous Fish_). (_Sea-Dragons_). Amniota (_Amnion Animals_). | Dipneusta | | | (_Mud-Fish_). | Amphibia (_Batrachians_). Ganoidei | | | (_Ganoid Fish_). +----------+-------+--------------+ | | | Amphipneumones | (_Vertebrate Animals, breathing through lungs_). | | +--+------------------------------+ | SELACHII (_Primeval Fish_). | PISCES (_Fishes_). | | Amphirrhina Cyclostoma (_Double Nostrils_). (_Round-mouthed_). | | +----------------------------------------------+--------+ | Monorrhina (_Single-nostriled_). Craniota (_Animals with Skulls_). Leptocardia | (_Tube-hearted_). | | | Thaliacea. +--------+--------+ (_Sea-Barrels_). Ascidiæ. | | | Acrania +--------+-------+ (_Skull-less Animals_). | Tunicata Vertebrata (_Tunicate Animals_). (_Vertebrate Animals_). | | +-------------------+---------+ | Vermes (_Worms_). | Zoophytes | (_Animal Trees_). | | | +-----+-----+ | Protozoa (_Primeval Animals_).