Page:The Osteology of the Reptiles.pdf/273

Rh. Lower Permian. Stereosternum Cope (Notosaurus Marsh), Mesosaurus Gervais, Brazil. Mesosaurus Gervais (Ditrichosauruus Gurich), ? Noteosaurus Broom, South Africa.



Marine reptiles with all aquatic adaptations of the tail-propelling type: elongated face; posterior nares, sclerotic plates, short neck, elongated body, no sacrum, long, flattened or dilated tail, short