Craniata

The collar is the first commencement of a structure destined to assume great importance in _Cephalochorda_ and _Craniata_, and perhaps protective of a single gill-slit in _Balanoglossus_ before the number of those apertures had been extended.

Form and Function A Contribution to the History of Animal Morphology

Craniata = all "true vertebrata": fishes, amphibia, reptiles, birds, and mammals (Vertebrata of Balfour).

Text Book of Biology, Part 1: Vertebrata 1906

And, behold! there is a lengthy attempt to write the matter up in full, in which, among other things, he was seeking to show that, on this basis, the mode of termination of the notochord in the Craniata, and in the Branchiostomidae (in which the trabecular arch is undifferentiated), is readily explained.

The Life and Letters of Thomas Henry Huxley Huxley, Leonard 1900

And, behold! there is a lengthy attempt to write the matter up in full, in which, among other things, he was seeking to show that, on this basis, the mode of termination of the notochord in the Craniata, and in the

Life and Letters of Thomas Henry Huxley — Volume 3 Leonard Huxley 1896

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