C. terrificus ranges from Arizona to Argentina, and is the only species of Rattle-Snake in South America. It differs from the others by having a pair of prefrontal shields behind the pair of internasals.
INDEX
Every reference is to the page: words in italics are names of genera or species; figures in italics indicate that the reference relates to systematic position; figures in thick type refer to an illustration; f. = and in following page or pages; n. = note.
Abdominal armour, of Cricotus, [287];
of Microsauri, [289];
of Prosauri, [290]
Abdominal ribs, of Rhynchocephali, [292], [298];
of Dinosauria, [414];
of Megalosaurus, [421]
Aberrant scaling of Lacertilia, [495]