. A descriptive catalogue of the marine reptiles of the Oxford clay. Based on the Leeds Collection in the British Museum (Natural History), London ... Reptiles, Fossil. PELONEUSTES. 31 part of the posterior vertical semicircular canal () ; this passage communicates with the large rounded fossa (a.) situated on the antero-internal face of the opisthotic and lodging the ampulla of the canal; this same cavity also communicates with the channel of the horizontal semicircular canal (), the opening of which is in the middle of the facet for the prootic. The inner face of the exoccipital is
. A descriptive catalogue of the marine reptiles of the Oxford clay. Based on the Leeds Collection in the British Museum (Natural History), London ... Reptiles, Fossil. PELONEUSTES. 31 part of the posterior vertical semicircular canal () ; this passage communicates with the large rounded fossa (a.) situated on the antero-internal face of the opisthotic and lodging the ampulla of the canal; this same cavity also communicates with the channel of the horizontal semicircular canal (), the opening of which is in the middle of the facet for the prootic. The inner face of the exoccipital is concave from above downwards ; it is perforated by two foramina, the upper (f.) perhaps for a blood- vessel, the lower for the hypoglossal nerve (XII.); this latter opens externally on the posterior wall of the outer opening of the jugular foramen (jug.). This foramen is exoA. bdcf bocf. Bones of the auditory region of the skull of Peloneustes philarchus (E. 3803, | nat. size) : A, prootic, inner face ; B, prootic, outer face; C, supraoccipital, anterior face ; D, exoccipital-opisthotic, inner face ; E, exoccipital-opisthotic, anterior face. a., cavities for ampulla; , channel for anterior vertical semicircular canal; , facet for basioccipital borne by exoccipital; ', facet for basioccipital borne by opisthotic ; , facet for exoccipital- opisthotic ; /., ? vascular foramen ; , channel for horizontal semicircular canal; jug., jugular foramen ; }., paroccipital process ; , facet for parietals ; , facet for prootic; , channel for posterior vertical semicircular canal; , quadrate facet on paroccipital process; s., remnants of suture between the exoccipital and opisthotic ; , facet for supraoccipital: XII, foramen for the hypoglossal nerve. enclosed between the exoccipital behind and the opisthotic in front; it is a large oval opening which no doubt transmitted the vagus nerve together with other nerves and vessels ; extern
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectreptile, bookyear1910
