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Summary.

  • 1
    The alary forms the lateral support of the entire lateral wall of the apertura externa and vestibulum.
  • 2
    The crista subnasalis is absent.
  • 3
    The anterior undivided part of the crista intermedia is much bigger than in Rana.
  • 4
    The posterior vestibular “Wulst” is absent.
  • 5
    The plica obliqua is suspended from the tectum nasi.
  • 6
    The infundibulum possesses an extra antero-ventral extension.
  • 7
    A well-developed recessus sacciformis is present.
  • 8
    The cavum medium, being more posteriorly situated than in the European Rana, does not share in the formation of the recessus sacciformis.
  • 9
    The ductus nasolacrimal opens into the roof of the horizontal part of the infundibulum.
  • 10
    The recessus lateralis attains an enormous size.
  • 11
    The plica isthmi is absent.
  • 12
    The intermaxillary gland opens into tho buccal cavity by two main ducts only.
  • 13
    The septomaxillary consists of an anterior unpaired portion which has two posteriorly-directed processes.
  • 14
    The connective-tissue between the latter bone and the lamina inferior tends to disappear.
  • 15
    The vomer (prevomer) is divided, consisting of an anterior edentulous and a posterior dentigerous portion.
  • 16
    The os en ceinture is paired.
  • 17
    The foramen for the IVth nerve is situated in front of the foramen opticum.
  • 18
    The arteria carotis cerebralis enters the skull through a separate foramen.
  • 19
    The foramen perilymphaticum superius does not communicate with the jugular foramen.
  • 20
    The fronto-parietal fontanelle is large.
  • 21
    There is only one dorsal fenestra in the chondocranium.
  • 22
    The annulus tympanicus is sickle-shaped.
  • 23
    The hyomandibular branch of the trigeminal nerve is ventrally situated to the plectrum.
  • 24
    The posterior part of the operculum is weakly perichondrally ossified.
  • 25
    The articular region differs from that of Rana.
  • 26
    Crinia possesses a bursa angularis oris.
  • 27
    The hyale is confluent with the otic capsule.