Ophidia, Amphisbaena, Rhiptoglossa of the Squamata. In the Chelonia (Fig. 30 b) they have been identified with a plate of bone intercalated between the descending plate of the parietal and the basisphenoid of many forms. Their real homologues are yet doubtful; by some they have been identified with the alisphenoid of the mammals.
Fig. 8. Labidosaurus hamatus Cope. Cotylosaur skull: A, right quadrate from below; B, the same from above; C, posterior basicranial bones from above.
Fig. 9. Labidosaurus hamatus Cope. Cotylosaur skull: from behind.
Supraoccipital (so). (Figs. 9, 21 b, 42 d.) Unpaired, articulating with the parietals and interparietals above, the exoccipitals, paroccipitals, and proötics, and including a part of the semicircular canals formerly believed to be in a separate bone called the epiotic, but which has never been demonstrated in any air-breathing
