Figure 6. A in Revision of the cranial anatomy and phylogenetic relationships of the Eocene minute boas Messelophis variatus and Messelophis ermannorum (Serpentes, Booidea)

Figure 6. A, embedded side of the holotype specimen of Messelophis variatus (SMF ME 1828 a+b), with a left lateral view of the skull. Lateral views of the posterior part of the skulls of Tropidophis haetianus (B), Lichanura trivirgata (C), and Exiliboa placata (D). Abbreviations: b, bubble; cb, compound bone; frc, foramen for the re-entry of the cid nerve; ls, laterosphenoid; ot, otooccipital; p, parietal; pot, prootic; q, quadrate; s, stapes; st, supratemporal; V2, anterior trigeminal foramen; V3, posterior trigeminal foramen; VII, foramen for the passage of the facial nerve.