1. The buccal-pharynx cavity was large and there were serration cingula on the upper jaw and mandible, vomer and palatine bone; The mucosa was composed of stratified squamous epithelium with many mucous secretory cells and a few goblet cells in buccal-pharynx cavity;
口咽腔较大，上下颌，犁骨及腭骨均有细齿带，粘膜由复层鳞状上皮组成，并含有大量黏液细胞和少量杯状细胞；