Albert C. L. G. Günther,
An Introduction to the Study of Fishes
(1880)
“ The primordial cranium of the Dipnoi is cartilaginous, but with more or less extensive ossifications in its occipital, basal, or lateral portions, and with large tegumentary bones, the arrangement of which varies in the different genera. There is no separate suspensorium for the lower jaw. A strong process descends from the cranial cartilage, and offers by means of a double condyle (Fig. 35 s) attachment to corresponding articulary surfaces of the lower jaw. ”
