Dinosaicrfroin the Loiver Lias. ,571 



tlie great development of the anterior ascending process of 

 the astragalus shows clearly that this Liassic type is more 

 nearly related to the Jurassic members of the group than (o 

 those from the Trias. Dr. von Huene (Pakeont. Abhaudl. 

 Suppl. 1, Lief. 5 (1908), p. 326) agrees with this view, and 

 goes so far as to refer the animal to the oenns Megalosaurus. 



These two specimens seem to be the only Megalosaurian 

 remains known up till now from the Lower Lias — at least, 

 of tliis country. 



Recently Mr. S. L. Wood has obtained from the Lower 

 Lias of Barrow-on-Soar, Leicestershire, portions of the 

 pelvis, an imperfect left femur, and part of a vertebral 

 centrum of a small Theropodous Dinosaur ; these specimens 

 form the subject of the present note. 



The pelvis is represented by (1) the anterior portion of 

 the left ilium, with which is united the proximal end of tlie 

 pubis ; (2) the acetabular region of the right ilium, with 

 which are united portions of the proximal ends of the 

 pubis and ischium ; (8) the posterior end of the right 

 ilium, the precise position of which in relation to the 

 anterior portion can only be approximately determined. 

 The femur belongs to the left side and is imperfect at both 

 ends. The vertebra is represented only by about half the 

 centrum and part of the neural arch; it probably belongs to 

 the dorsal region. 



The ilium (fig. 1), so far as preserved, is very similar to 

 that of Megalosaurus hucklandi. Its anterior portion («./.) 

 forms a Ijroadly rounded lobe, the outer surface of 

 which is gently concave externally ; the bone in this 

 region is very thin, with a slightly thickened upper 

 border, the surface of which is somewhat roughened for the 

 attachment of muscle. The anterior lobe is separated from 

 the relatively massive pubic process (p.p.) by a much 

 narrower preacetabular notch {p.n} than in Megalosaurus, 

 and more nearly similar to what is seen in Ceratosaurus, in 

 which, however, the pubic process is less massive. The 

 narrowness of this notch seems to be due partly to tlie 

 relatively large size of the pubic process and partly to its 

 being directed more forwards and less downwards than in 

 the othei' forms referred to. The pubic process is tri- 

 angular in section, the ventral (acetabular) surface {acet.) 

 being deeply concave from side to side. This concavity is 

 continuous with the rest of the acetabular sur.'ace of the 

 ilivxm, the outer edge of which forms a ])rominent and sharp- 

 edged lip, which increases in width towards the point of 

 union with the ischium. The anterior end of the pubic 



