292 Dr. Francis Baron Nopcsa — British Dinosaurs. 



same part in the Senonian Megalosaurus Bredai, one remarks that the 

 same sort of change and diminution as I pointed out among the 

 Ornithopodidge can also be traced among the Theropoda, in consequence 

 of which I feel unable to accept Hulke's statement that in the 

 Theropoda the trochanter en Crete represents a more primitive type 

 than the pendant trochanter. 



Distally the femoral ectocondyle of Streptospondyhis shows a 

 smaller posterior projection, much like that in Megalosaurus, 

 Allosauriis, and the bird Apteryx, while in Iguanodon and some birds 

 (for example, Cygnus) this part is constructed after another fashion. 

 The distal end of the strong tibia is one of the few fragments of limb 

 bones preserved in the Paris specimen, but this, I regret to say, has 

 been described and figured as Megalosaurus, and only the complete 

 tibiae of Mr. Parker's specimen show that the fragment in reality 

 belongs to Streptospondyhis, from which it has been separated for 

 neai'ly a hundred years. 



As the proportion of femur and tibia among Dinosaurs seems to be 

 of the greatest interest, since it appears that among all Dinosaurs 

 there exists a tendency to elongate the femur, a list of ten Dinosaurs 

 is here given in which the proportion of femur to tibia is expressed 

 according to the formula -^femur : tibia = x : 1. 



(Italics indicate Triassic or primitive forms.) 



A more complete list, containing 24 genera, will be given in my 

 later paper on Streptospondyhis. 



The proximally expanded fibula of Streptospondylus is conspicuous 

 on account of its slender character, especially when compared with 

 the robust form of the associated tibia. In consequence of this dis- 

 proportion it seems much more slender than in either Creosaurus, 

 Allosauriis, or the Triassic forms. It does not show any trace of 

 distal expansion. 



In the astragalus, which is applied firmly to, but not united with, 

 the calcaneum, a well-developed ascending process is always present, 

 but never reaches so high as in PoiMlopleuron. As in the latter* 

 animal it is applied against a projection of the tibia. I wish 



