1895.] FRILLED LIZARD OF TBOPICAI, AUSTRALIA. 719 



differed from any other Dinosaur previously described," was 

 associated with the circumstance that " its tail was quite slender 

 and flexible, and evidently usually carried free from the ground." 



It is further worthy of note that in Marsh's figure above quoted 

 the pelvis of Anchuaurus is represented as corresponding more 

 nearly with that of existing Eeptilia than with that of the more 

 typical Dinosauria. The prolongations of the ilia iu front of the 

 acetabula are relatively short, while the pubes are directed distinctly 

 downwards and forwards like those of all ordinary Lacertilia. 



The Dinosaurian type most worthy of attention in correlation 

 with Chlamydosaurus is the Gompsocjnathus longipes of A. Warner 

 yielded by the lithographic stones of Soleuhofen. An admirable 

 cast from the type specimen, which is almost perfect, is also on 

 view in the Geological Department of the Natural History Museum. 

 In size, in the slender character of the entire skeleton, and in 

 the relative proportions of the fore and hind limbs, it is almost 

 a counterpart of Chlamydosaurus Mngi. 



In a notable essay, entitled " Animals which are most nearly 

 intermediate between Birds and Reptiles," contributed to the 

 ' Popular Science Eeview ' in the year 1866, the late Professor 

 Huxley makes a special reference to Gompsognathm. He says in 

 allusion to it, " It is impossible to look at the conformation of this 

 strange Eeptile and to doubt that it hopped or walked in an erect 

 or semi-erect position after the manner of a bird, to which its lono- 

 neck, slight head, and small anterior limbs must have given it an 

 extraordinary resemblance." 



Eeferring to this same type in his 'Anatomy of Yertebrated 

 Animals,' ed. 1871, p. 262, Professor Huxley remarks : — " The 

 pubes of Comj)sognathus, unfortunately obscured by the femurs, 

 seem to have been very slender, and to have been directed forwards 

 and downwards hke those of Lizards. Some Lizards in fact have 

 pubes which, if the animal were fossilized in the same position as 

 Compsognathus, would be very simUar in form and structure." And 

 again on page 263 : — " It remains to be seen now how far the 

 Hypsilophodont (Avian) modification of the pelvis extended among 

 the Ornithoscelida (Dinosauria). The remains of Compisognathus 

 and Stenopelyx tend to show that it was by no means universal." 



All things considered, Chlamydosaurus would appear to present, 

 in virtue of its erect gait, as distinct a divergence from among the 

 Lacertilia in the direction of certain of the Dinosauria, as do some 

 members of the last-named group towards that of the ordinary 

 Lizards, leaving between the two a by no means immeasurable 

 hiatus. Whether or not the remarkable locomotive comportment 

 of Chlamydosaurus here recorded has been transmitted by heredity 

 from a lizard-like Dinosaurian ancestor, such as Compsogvnthus, or 

 has been redeveloped independently among the Agamidae, may be 

 commended to the consideration of the herpetological expert. 



46* 



