LATERAL LINE SYSTEM IN EXTINCT AMPHIBIA Be 
Fig. 7 Fraas’ conception of the appearance in life of one of the gigantic 
labyrinthodonts, Mastodonsaurus giganteus, from the Triassic of Germany. 
The family represented by this animal constituted the largest forms of all known 
Amphibia with a maximum length of eighteen feet. They had a wide distribution 
but a short geological range, as our knowledge at present indicates. The figure 
is introduced here to give an idea of the possible appearance of the lateral line 
canals, on the animal when alive. Possibly they have been too prominently 
represented; but in the skulls studied by Doctor Fraas the lateral line grooves 
were broad deep furrows, cut very sharply into the facial bones. After Fraas. 
