cephalon

[ sef-uh-lon, -luhn ]

/ ˈsɛf əˌlɒn, -lən /

the head, especially of an arthropod.

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1870–75; <New Latin, for Greek kephalḗ head

The first represent the last segment of the cephalon; the remainder belong to the thorax.
The Appendages, Anatomy, and Relationships of Trilobites|Percy Edward Raymond
Viewed from the lower surface, the appendages are practically confined to the cephalon and thorax.
The Appendages, Anatomy, and Relationships of Trilobites|Percy Edward Raymond
The cephalon is about as wide as long, and eyes have not yet been seen.
The Appendages, Anatomy, and Relationships of Trilobites|Percy Edward Raymond
Cephalon furnished with a sharp anteriorly directed dorsal tooth.
Journal of Entomology and Zoology: Volume 6, Number 4, December 1914|Various

The interpretation of the appendages of the cephalon is somewhat difficult.
The Appendages, Anatomy, and Relationships of Trilobites|Percy Edward Raymond