THECODONTIA 25 1 



to ascertain whether the caudal vertebrae are characterized, as 

 in the Thuriugian Protorosaur, by double diverging spinous 

 processes. 



Genus Belodon, Von Meyer. 



Sp. Belodon Plicningeri. — The reptile from the upper white 

 keuper sandstone of Wirtemberg, described by Plieninger,* 

 agrees in its essential characters so closely with the thecodont 

 Saurians of the Bristol conglomerate as to add to the proba- 

 bility of both belonging to the same lower mezozoic period. 



Three vertebras are modified to afford adequate attachment 

 to the iliac bones in Belodon, and this additional evidence of 

 affinity to Dinosauria may have characterized also the English 

 Thecodonts. 



Genus Cladyodon, Ow. 



Sp. Cladyodon Lloydii. — In the Memoir on the Triassic 

 Eed Sandstones of Warwick, by Murchison and Strickland, 

 published in 1840, in the 2d series of the Geological Transac- 

 tions, vol. v., a tooth, which is an extremely rare fossil in those 

 English formations, was figured in pi. xxviii., fig. G. 



Having had the opportunity of studying the original speci- 

 men and fragments of some others of seemingly the same 

 species from the new red sandstones of Warwick and Leaming- 

 ton, the writer recognized the affinity of the reptile possessing 

 those teeth to the thecodont reptiles of the Bristol conglomerate, 

 and indicated what appeared to be a generic modification of 

 dental form by the term Cladyodon.^ He subsequently received 

 other specimens of the teeth characterizing this genus, which 

 may be described as being two-edged, sub-compressed ; the 

 sides more or less convex ; the edges more or less sharp, and 



• AVijrtemb. naturf. Jahreshefte, viii., Jahrg. 1857, p. 389. Jaeger's 

 PJu/tosaurus appears to have been founded on casts of the sockets of the teeth 

 of Belodon. 



f Reports of the British Association, "Brit. Fossil Reptiles, " 1841, p. 155. 

 (See fuller descriptions, with figures, in Odontography, pi. 62, A, fig. t, a, b.) 



