from The Century Dictionary.
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from Wiktionary, Creative Commons Attribution/Share-Alike License.
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But in fact the skull _is_ segmented, and, according to the quasi-vertebral theory of the skull put forward by Professor Huxley,  is probably formed of a number of coalesced segments, of some of which the trabeculæ cranii and the mandibular and hyoidean arches are indications.
A velum (v.) forms a curtain, perforated by the mouth and by two smaller hyoidean apertures, between the oral cavity and the pharynx
The [so-called] hyoidean apertures are not equivalent to the similarly-named parts of the vertebrata.
Uppermost left-hand figure, the youngest condition; lowest right-hand figure, the adult. h, the hyoidean arch, ultimately the corniculum; b¹-b4, the four branchial arches which become gradually atrophied, the cornua (or thyro-hyal) th being their representative in the adult; b ', another branchial rudiment; bh, the body of the hyoid. "body" of the os hyoides.
The right, great cornu is shown extending backwards from the body of the Hyoid and terminating beneath the letters Ep.Fig. 40 -- Extracranial portion of hyoidean apparatus of Dog, front views sh, stylohyal; eh, epihyal; ch, ceratohyal (these three constitute the "anterior cornu"); bh, basihyal, or "body" of hyoid; th, thyrohyal, or "posterior cornu."