Prefrontal, Lacrimal, Adlacrimal In the skull of lizards there is a large triangular bone lying in the anterior part of the orbit, above and behind the maxillary and below the frontal. This bone, or pair of bones on opposite sides, is commonly called the prefrontal. This prefrontal of lizards has been shown by Gaupp2 to resemble the lacrimal of mammals—that is, it has similar relations to the surrounding bones, to the lacrimal duct, and to the underlying cartilage skull in the embryo. On account of these resemblances between reptilian prefrontal and mammalian lacrimal, Gaupp believes that these elements are homologous with each other, and hence he has given up the name prefrontal for the reptilian element and calls it instead lacrimal, in order to make the terminology of the reptilian skull conform with that of the mammal.
What, then, is that other bone of the lizard skull which until Gaupp’s . . .
- Received 11 January 1913.
- © 1913 Geological Society of America