188 LABYRINTHODONTIA. 



R. 1457. Cast of a fragment of shale showing the frontal aspect of 

 the anterior portion of the cranium. The original was 

 obtained from the Eothliegendes of Ruppersdorf, and i3 

 figured by Fritsch in his ' Fauna der Gaskohle,' vol. ii. 

 pi. lv. fig. 1. Purchased, 1888. 



R. 1458. Cast of a fragment of shale showing a lateral aspect of a 

 sacral region, referred by Fritsch to this form. The 

 original, which is from Oelberg, is figured by Fritsch, op. 

 cit. p. 24, fig. 133. Both the intercentra (hypocentra) 

 and the basal portions of the pleuralia (hypocentra arcalia) 

 are shown. Purchased, 1888. 



Genus SPHENOSATJRUS, Meyer 1 . 



Known only by a portion of the trunk, which is regarded by 

 Fritsch as indicating a Labyrinthodont allied in the structure of the 

 vertebrae to Chelyosaurus, although considered by Baur 2 to belong 

 to a reptile. Cope 3 adopts the view of the Labyrinthodont affinity 

 of the genus, and makes it the type of the family Sphenosauridce, 

 which includes Chelyosaurus and Sparagmites, and differs from the 

 Archegosauridce by the presence of the hypocentrum pleurale. 



Sphenosaurus sternbergi (Fitzinger 4 ). 

 Syn. Palceosaurus sternbergi, Fitzinger 5 . 



Apparently about one half the size of Eryops megacephalus. 

 Hah. Europe (Bohemia). 



R. 1459. Cast of a slab of red sandstone exhibiting the ventral 

 aspect of the thoracic and sacral region of the vertebral 

 column, the pelvis, and one femur. The original, which 

 is the type, is preserved in the Museum at Prague, and, 

 according to Fritsch, was probably obtained from the 

 Permian at the foot of the Riesengebirge, Bohemia. It is 

 figured by Meyer in his 'Fauna der Vorwelt — Saurier 

 aus dem Muschelkalk,' pi. lxx., where it is regarded as 

 having been obtained from the Bunter ; it is also figured 

 by Fritsch in his ' Fauna der Gaskohle/ vol. ii. pi. lix., a 

 diagrammatic restoration being given on p. 28, fig. 136, 



1 Fauna d. Vorwelt — Saurier aus d. Muschelkalk, p. 141 (1847). 



2 Biol. Centralblatt, vol. vi. p. 356 (1886). 



3 Amer. Nat. vol. xx. p. 77 (1886). 



4 Ann. Wien. Museums, vol. ii. p. 171 (1840).— Palceosaurus. 



5 Loc. cit. 



