526 MOODIE. [Vor. XIX. 
sity of Chicago. It does not differ greatly from that 
described below for the mandible of Anaschisma. 
Although Archegosaurus (16) has been known for nearly 
sixty-five years, we have had as yet no adequate discussion of 
the manner of occurrence of the lateral line canals on the 
cranium of this form, where they assuredly occur. Bur- 
meister, it is true, gave a figure of the canals as he thought 
they occurred on the cranium, but von Meyer states (16) that 
his representation is incorrect and seemed to be based in large 
part on the cranium of Trematosaurus. Although von Meyer 
criticised Burmeister’s representation of the canals, yet he 
himself does not give any representation except in patches 
here and there on the skulls. Surely among the nearly two 
hundred specimens which von Meyer had at his disposal when 
he wrote on Archegosaurus there was sufficient information to 
have given such a restoration. There are two poorly pre- 
served skulls of Archegosaurus decheni Goldfuss in the Field 
Museum. I have studied these specimens, which are preserved 
in the characteristic nodules much like those from the Mazon 
Creek region, but was unable to make out anything definite 
in regard to the lateral line canals on account of the poor state 
of preservation. The or!ly other well-known form of the 
Temnospondylia with which I am acquainted, is that of Gond- 
wanosaurus. This is represented by an almost entire cran- 
ium, but the cranial elements have almost all disappeared and 
have left only the sandstone cast. 
The lateral line canals are well developed on the skulls of 
the Stereospondylia. Like the majority of the Stegocephala 
the cranial elements are strongly pitted and grooved. The 
sutures between the elements of the skull are usually clearly 
marked by smooth, narrow grooves. The lateral line canals 
can always be distinguished from the sutural grooves by the 
shape of the bottom, being U-shaped in the former, and V- 
shaped in the latter. The lateral line canals also at times have 
their bottoms roughened by pits occurring in them, the sutural 
grooves always have smooth bottoms. ‘The lateral line canals 
are “usually rather shallow and sometimes broad with the 
