Reviews — Dr. A. Fritsch's Permian Amphibia of Bohemia. 527 



In Sparodus validus there are 17 teeth in the lower jaw ; and there 

 are 27 on each vomer, the largest rows being towards the palatine 

 bone. The palatine bone carries 11 teeth. The skull is more wedge- 

 shaped than in Branchiosaurus. 



Of Hylonomus two species are recognized, but these are only 

 known from small portions of jaws. Hylonomus acuminatus has 

 the teeth marked with distant parallel ribs. 



The last genus in the present part of the work is named Daivsonia. 

 It is very nearly allied to Hylonomus, but the author is unable to 

 see his way to uniting the genera, because Dr. Dawson figures 

 elements of the skeleton which differ from the Bohemian specimens. 

 The vomer (v) has a small group of minute teeth on its outer edge, 



MAM 



Fig. 5. — Restoration of the under-side of the skull of Dawsonia polydens, Fritsch. 

 Twice the natural size. 



and both the parasphenoid (Pf.) and pterygoid (Pt.) carry numerous 

 small teeth. The palatine bone (p) has a single row of teeth which 

 become larger posteriorly. The hindermost and largest tooth is 

 grooved at the base. The external surface of the skull-bones is strongly 

 sculptured. The thoracic scute has a long rhomboidal form, and is 

 furrowed like the skull-bones. The teeth in the jaws are smooth 

 and of uniform size. The premaxillary is broad, with about eight 

 large teeth of equal size. The anterior process of the parasphenoid 

 widens in front, and is slightly forked. This skull has never yet 

 been found entire, but has been reconstructed from several frag- 

 ments, and is believed to have been rather broader than long. The 

 vomer (v) is forked behind, as though for the posterior nares. The 



