248 H. G. SEELEY ON THE DINOSAURS 



The lateral trochanter (I t, figs, b and c) is rather less than 5 cm. 

 (2 in.) long, tapers proximally and distally, is compressed from above 

 and below, and shows on the anterior side a small muscular scar, 

 which deepens towards the distal border. The trochanter extends 

 within about 7| cm. (3 in.) of the proximal end ; it is directed a 

 little inward and backward. At the upper limit of the trochanter 

 the shaft is approximately triaugular, being flattened below, while 

 the inner and outer sides converge to the median anterior ridge. 



The head of the bone (Ji, fig. b) has the aspect of being bent inward, 

 the external outline being strikingly convex, and the inner border con- 

 cave, so that the transverse width of the head, as preserved, is not 

 more than 6^ cm. (2f in.). Externally and superiorly there was a 

 trochanter, which formed an angular ridge ; it was divided from the 

 head of the bone by a vertical groove, but must have been short, 

 since the bone could not have extended more than from 1 to 2 cm. 

 proximally beyond the base of the groove which proves its existence. 

 Internal to this trochanteric ridge the bone is compressed and con- 

 cave. As preserved, the articular head of the bone is 2 cm. (4 in.) 

 thick, and less than 3 cm. (1-i- in.) deep ; but it is abraded, and there 

 is no trace left of articular surface, or of the proximal cartilaginous 

 tissue of the bone, which from within outward did not measure 

 more than 6 cm. (2^- in.), and now measures rather less ; the pos- 

 terior surface behind the articular head is somewhat inflated, so as 

 to make the transverse section semicircular. Seen from the inner 

 side the head of the bone is inclined towards the inner trochanter, so 

 that it has a slightly oblique appearance as to its vertical direction 

 (fig. b) ; but it is almost at right angles to the external surface of 

 the shaft. 



The differences of this bone from the femur of Megalosaurus 

 Bucklandi extend to almost every detail : first, the distal end of the 

 bone is compressed from front to back, while in Bucldandi it thickens ; 

 the lateral internal trochanter is much more proximal in position ; 

 the external trochanter is much much closer to the head of the bone 

 in this specimen, and more proximal in position ; the curvature of the 

 shaft is relatively greater, and its antero-posterior thickness is greater. 



Okthomertjs Dollot, Seeley. 



IN 0.42955. A large femur (fig. 2), which is slightly imperfect at 

 its articular ends, measures 49-i- cm. (19^ in.) in length. The shaft 

 is remarkably straight and strong. The bone is subtriangular at the 

 proximal end, is subquadrate but wider than thick in the lower part 

 of the shaft, and has the lateral trochanter in the middle of the shaft, 

 with the proximal and distal ends modified on the Iguanodont plan. 



The distal end of the femur is fractured in front (fig. 2, b), where 

 the condylar portion was probably a little expanded anteriorly, as 

 in a second and smaller specimen (fig. 2, d). Across the condyles 

 of the type the measurement is fully 10 cm. (4 in.). The posterior 

 inner condyle is considerably the larger; and the two are divided by a 

 deep concave channel (fig. 2, a). The external or anterior distal con- 

 dyles were similarly divided by a concavity, so that the thickness of 



