New Genera of Batrachian Footprints. 105 



and second that the print of the fore foot was close 

 behind that of the hind and apt to be confused with it. 

 But it differed frormthe footstep left by animals of that 

 genus in having a small and narrow sole ; so small that 

 Sir Wrn. Dawson referred it provisionally to Hylopus. 



These little animals had broad bodies, and probably 

 were sluggish in their movements. The track was as 

 wide as the space between each footmark in the row of 

 footsteps. 



3ylovus (?) trifidus, Dawson (PL Figs. Qa and 6&) is the 

 type of this genus. The name is in allusion to the bird- 

 like track, with three toes directed forward in a radiate 

 manner like the wading birds. 



Baropezia n. gen. 



Sauropus [Lea ?], as denned by Sir Wm. Dawson, con- 

 sisted of " large plantigrade animals, probably Labyrin- 

 thodonts, or allied. Hind foot usually larger, five toes." 



The track described by Dr. Lea under this name was 

 not very different from that which Dr. King had pre- 

 viously described inadvertently under the name of 

 Sphaeropezium (changed by him in the same year to 

 Thenaropus), either in size or in general appearance. 

 There were, however, some important differences. Sauro- 

 pus was represented as having a median " tail mark " or 

 groove, and, so far as the figure shows, the fore foot left 

 three toe prints in place of four as in Thenaropus. 



Unless, therefore, Sauropus is made very broad in its 

 scope, it will not include &, Sydnensis, in which the for- 

 mula of the toes is 4 — 3 ; that is four on the hind and 

 three on the fore. Also the form of the sole and toe 

 prints is in many respects quite different from Lea's 

 Sauropus, and more like King's Sphasropeziuni. There is 

 also in S. Sydnensis, Dawson, no median furrow between 

 the footprints ; in this it differs from Lea's species. . It 

 would seem necessary, therefore, to separate Dawson's 

 species from Sauropus. 



