Dr. Franck Baron Nopcsa — British Dinosaurs. 2'±3 



After these preliminary remarks one can determine as belonging 

 ■to Folacanthus — 



4 free dorsal vertebra;, 



11 co-ossified vertebra;, forming together with ribs and dermal armour the lumbo- 

 sacral shield, 

 19 caudal vertebrae, 



7 right ) ••, 



3 left r^^^' 



2 femora, 



1 right tibia with fragment of fibula, 

 1 right (?) metatarsallbone, 



3 left ) J 1 . 



5 right 1 ^°^"'^1 ^P^'^e^' 



6 rio-ht } "PP'^^ caudal plates, 

 some plates of uncertain position, 



find besides these numerous fragments. Comparing these data with 

 those given by Fox, one remarks that only some metatarsals, 

 phalanges, and dermal spines are missing. 



Vertebi'cB. 



Although the vertebrse have been described by Hulke, still 

 I think some characters have not been clearly brought out ; more- 

 over, a comparison between the vertebrae of Folacanthus and other 

 Dinosaurs is still entirely wanting. To Hulke's description of the 

 foremost dorsal vertebree scarcely anything has to be added, except 

 the facts that the fractured surface of the spinous process shows 

 a quadrate outline, that the neural canal shows lateral compression, 

 that the pr^- and postzygapophyses are remarkably near the median 

 line of the body, and that the postzygapophyses project rather far 

 backwards. 



Taking into consideration that only 4 free dorsal vertebrae are 

 present, while one can count not less than 7 ribs belonging to the 

 right side, and that between the first and second of these ribs a con- 

 siderable difference is observable, it is obvious that Folacanthus 

 possessed at least 8 free dorsal vertebrse, so that together with 

 the 5 anchylosed lumbodorsal vertebrae the back of Folacanthus 

 consisted of at least 13 vertebrse, and assuming the presence of at 

 least 7 cervical vertebrse, this accords well with the number of 

 vertebrae in Scelidosaiiriis (22), while in the reconstruction of Stego- 

 saurus 24 vertebrse are given. In Triceratops still more vertebrse 

 seem to have been present. At all events the back of Folacanthus 

 must have attained a length of 90-100 cm. This dimension will 

 prove of great value in the reconstruction of the dermal armour. 



Conipared with other Dinosaurs it is, as already mentioned, 

 Struthiosaurus to which the dorsal vertebrse of Folacanthus show 

 the most remarkable resemblance, and this is the reason why near 

 Fig. 1, representing a dorsal vertebra of Folacanthus, a sketch of 

 a Struthiosaurus vertebra is also given. There seems, furthermore, 

 some afiSnity to exist with the vertebrse of Omosaurus, while there 

 are no points of resemblance between our animal and the North 



