protrito^id^;. 213 



Sparodus crassidens, Fritsch \ 



Syn. Batrachocephalus crassidens, Fritscli 2 . 



Twenty-five maxillary teeth, which are smaller than in the type 

 species, and of which the anterior ones are not enlarged ; vomerine 

 teeth apparently less numerous ; outer surface of mandible pitted. 



Hab. Europe (Bohemia). 



R. 347. Electrotype from a fragment of shale, showing the palatal 

 aspect of the skull and the middle thoracic plate. The 

 original, which is one of the types,- was obtained from the 

 Rothliegendes (Lower Permian) of Kounova; and is 

 figured by Fritsch in his •' Fauna der Gaskohle,' vol. i. pi. x. 

 fig. 1. Purchased, 1882. 



R. 346. Electrotypes from two fragments of shale, showing parts 

 of the upper and lower jaws. Originals from Kounova ; 

 figured by Fritsch, op. cit. pi. ix. figs. 4, 9. 



Purchased, 1882. 



Genus DAWSONIA, Fritsch 3 . 



The vomers much smaller than in Sparodus, and having only a 

 few teeth at their antero-external angles ; small denticules on the 

 stem of the parasphenoid and the anterior portions of the pterygoids, 

 and long teeth on the outer border of the latter ; cranial bones 

 strongly sculptured. 



Dawsonia multidens, Lydekker (n. nom.). 

 Syn. Daicsonia polydens, Fritsch 4 . 



The type and only described species. Length of skull about 

 0,038. 



Hab. Europe (Bohemia). 



The originals of the following specimens, which include the types, were 



obtained from the Rothliegendes (Lower Permian) of Kounova. 



The specimens iv ere purchased in 1882. 



R. 340. Electrotypes from two fragments of shale, showing the 



parasphenoid and fragments of the skull. Originals 



figured by Fritsch in his ' Fauna der Gaskohle/ vol. i. 



pi. xi. fig. 6, and pi. xii. fig. 7. 



1 Sitz. k. bohm. G-es. Wiss. for 1875, p. 76 (1876).— Batrachocephalus. 



2 Loc. cit. 



3 Fauna der Gaskohle, vol. i. pt. i. p. 89 (1879). 4 Ibid. p. 90.— Hybrid. 



