much elongated in certain Iguanidae, [529];

meeting ventrally in Chameleons, [568]

Ridewood, on hyoid apparatus of Anura, [31]

Ringhals, [632], [633]

Ritter and Miller, on Autodax, [107]

Robinson, on peculiar use of Varanus, [546]

Rodriguez, gigantic tortoises, [374]

Rostral bone of Ceratopsia, [430]

Round Island snake, [603]

Sacral vertebrae of Anura, [21], [22]