Frič's contribution to this volume was a list of Carboniferous animals he and his associates recently discovered at coal gas mines near the localities of Nýřany and Kounová.

Scincosaurus crassus was among the new tetrapods from Nýřany, and its short description (erroneously) considered it a robust lacertilian (lizard), possibly related to Sparodus.

Within this monograph, Frič identified Scincosaurus crassus as a nectridean and provided a comprehensive overview of the taxa's anatomy.

The skull of K. crassum was more heavily sculptured by pits and grooves and did not possess a significant overhang of the braincase, in contrast to K. galvani.

In 1903, German paleontologist Otto Jaekel noted that he could not find any evidence of the supposed jointed tabular horns on any Scincosaurus specimens.

Microsauria was kept separate from traditional linnean classes such as Reptilia, Mammalia, and Amphibia, due to paleontologists of the time being generally uncertain whether they were reptile-like amphibians or amphibian-like reptiles.

[11] During their description of the urocordylid Montcellia in 1994, Jean-Michel Dutuit and D. Heyler considered that S. spinosus may not belong to Scincosaurus, but rather its French close relative Sauravus.