No. 2.] LATERAL LINE IN EXTINCT AMPHIBIA. 523 
resented on the posterior border of the skull by elongate pits 
such as Andrews has described for Ceraterpeton. I fail to 
detect any pores in connection therewith such as Andrews 
describes for the lines in Ceraterpeton, and indeed I would be 
surprised if there were any since there is no evidence that 
the lateral line system in the Stegocephala was other than 
superficial. The temporal canal forms with the jugal canal 
a complete ring in this form much as in Trematosaurus, only 
in Tuditanus the temporal canal does not touch the epiotic. I 
think there are evidences of a former connection of the tem- 
Fic. 10.—Photograph of the skull of Diplocaulus magnicornis Cope. 
The arrows indicate the regions where the canals occur. One-third 
natural size. 
poral canal with the supraorbital, but am not sure of it. It is 
so represented tentatively in the diagram (Fig. 8). The tem- 
poral canal cuts the supratemporal (prosquamosal), the squa- 
mosal and the jugal. The jugal canal lies for the most part 
on the supratemporal and quadratojugal. It joins the infraor- 
bital on the jugal. A portion only of the infraorbital is pre- 
served and the remainder, i. e., its connection with the jugal 
canal, is restored. There is a portion of the supraorbital 
canal preserved. It seems not to be connected with the tem- 
poral canal, although there is a possible indication of this con- 
