Fig. 14. Fetuses ofDermophis mexicanus. A: At 37 mm total
length, the tooth crowns and the jaw articulartion elements
are mineralized (after Wake and Hanken, '82). ft = fetal teeth;
o = otic capsule; or = orbital cartilage; pa = pseudarticular
bone (dermal bone forming posterior lower jaw); pd = pseudodentary
(dermal bone forming anterior lower jaw); pq =
palatoquadrate (lower part ossifying; incipient quadrate element
of the adult articulation). B: 75 mm TL fetuses of D.
mexicanus in situ in the oviduct.