S. incrassatus, [231]
Stereorhachis, [308]
Stereospondylous vertebrae, defined, [284]
Sternothaerus, [324], [389], [390];
S. derbianus, [391];
shields of, [327]
Sternum, of Urodela, [15];
of Anura, [25];
taxonomic value, [141], [142];
of Sphenodon, [297] f.;