620 DR. R. BROOM ON 



collection as seen by Watson, it was scarcely at all developed, 

 and he did not recognise that the block of stone contained an 

 almost perfect skull which, had he seen it, would have prevented 

 the confusion of the two animals. 



In the type specimen is preserved the skull almost complete 

 but slightly crushed, and with the bones in beautiful condition and 

 showing nearly eveiy detail of structure. A number of cervical 

 and dorsal vertebrae are shown, both coracoids, the interclavicle, 

 the right clavicle and scapula, and the light humerus, radius, and 

 ulna. There are also seen in the specimen the whole of the 

 abdominal ribs in perfect condition, the pelvic bones in good con- 

 dition, but displaced, and most of the left hind limb. Other 

 specimens show the pelvic bones in position and most of the tail. 

 One specimen shows a dentary with a perfect right pes. 



The skull is very similar to that of Ornithosibchus ivoodivardi, 

 and there can be little doubt but that Ettparkeria belongs to the 

 same suboixler and to the same family, though the two genera 

 inust be regarded as distinct. From the snout to the occipital 

 condyle the skull measures about 83 mm. From the snout to 

 the front of the orbit is about 45 mm. The orbit is almost round 

 and has an antero-posterior diameter of 23 mm. There is a 

 large antorbital vacuity about 20 mm. in length. The infra- 

 temporal opening measures 18 mm. in height and its greatest 

 antero-posterior length at its lower part is 17 mm. The supra- 

 temporal fenesti'a is small, measuring 13 mm. by 10 mm. The 

 width across the frontals between the orbits is 14 mm., and the 

 width across the squamosals where they form the temporal arch 

 is 34 mm. 



The front part of the premaxilla is missing from the type, but 

 it was probably somewhat similar to that in Ornithosuchus and 

 other allied types. It forms the lower half of the posterior 

 margin of the rather large nostril. It supports at least two and 

 most pi-obably three flattened pointed thecodont teeth. 



There is no evidence of a septo- maxillary on the face. 



The maxilla is a long slender bone, which forms the lower 

 and anterior borders of the antorbital vacuity. The anterior 

 ascending process passes up behind the prema,xilla and the 

 descending antei'ior portion of the nasal, and meets the anterior 

 end of the large lacrymal. The posterior horizontal portion 

 passes back to below the middle of the orbit and meets the jugal. 

 It supports apparently 13 thecodont teeth, of which 5 are 

 preserved in the specimen. These are pointed flattened teeth, 

 very similar in genei'al shape to those of carnivorous Dinosaurs. 

 They are feebly serrated behind and probably also in front. 



The nasal is rather peculiar in shape. When viewed from 

 above, it appears as a long narrow bone about twice as wide 

 behind, where it meets the frontal, as in front. In reality the 

 front is as wide as the back part, as it forms a cuiious downward 

 process behind the nostril to meet the premaxilla. The peculiar 

 shape will best be luiderstood from the figures. 



