sh_). +----------+-------+--------------+
| |
| 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_). Ascidiae. |
| | Acrania
+--------+-------+ (_Skull-less Animals_).
|
Tunicata Vertebrata
(_Tunicate Animals_). (_Vertebrate Animals_).
| |
+-------------------+---------+
|
Vermes
(_Worms_).
|
Zoophytes |
(_Animal Trees_). |
| |
+-----+-----+
|
Protozoa
(_Primeval Animals_).

ANIMAL MONERA.
|
|
VEGETABLE MONERA. | NEUTRAL MONERA.
| | |
+---------------------+-------------------+
|
ARCHIGONIC MO