Cdomati from the Acmlomi.  Mantled Animals (tammie) and ohm'da-animsls (chordonia).  Seventh soft-worms (socie cido).  A Side Branch of the the acorn-worm (balanc glosm).  Di?ereutiation of the Intestinal Tube into Gill-intes tine and Stomach-intestine.  Eighth chorda-animals (char doais).  Ascidian Larva exhibits the Outline of a chords-animal. Ooustructiou of the Notochord.  Mantled Animals and Verte brates as Diverging Branches of chords-animala  Separation of Vertebrates from the other Higher Animal Tribes (articulated Animals, star-animals, Soft-bodied Animals).  Signi.?cance of the Hetameric Formation.  Sknll-less Animals (amnia) and Stalled Animals  Ninth Ancestral Skull-less Animals.  Amphioxus and Primitive Vertebrate.  Development cl Skulled Animals (construction of the Head, Skull, and Brain)  Tenth Ancestral Stage Skulled Animals, allied to the Cyclostomi (lysi aoida and Petromysoaido)