658 



PROF. H. G. SEELET ON THE REPTILE 



skill, and success. The shaft does not widen quite so rapidly towards 

 the distal end as in the smaller species, since the bone is 2| inches 

 wide only at 2 j inches further towards the distal extremity. The 

 surface is remarkably smooth and free from muscular markings, 

 except on what I regard as the outer side. This is roughened ; and 

 rather above its middle there is a chain of strong muscular eminences 

 (which appear to be much in the position of the inner straight ridge 

 described in Oratceomus lepidophorus, in which, however, the ridge 

 was only developed proximally). Here it is strong distally, and 

 would seem to have extended to the terminal articulation. The 

 middle of the inferior aspect is marked by a straight vascular groove 

 about an inch long in the upper half of the fragment : and at the 

 extreme distal margin towards the inner side there is a vertically 

 ovate muscular pit about 1 inch long. The distal extremity appears to 

 be curved downward and outward rather more than usual, while the 

 surface is more than usually convex. The sides, which are slightly 

 concave in length, are comparatively straight. The extreme width, 

 as preserved distally is 3 inches ; but this is fully 1 inch short of 

 what must have been the end of the specimen. 



Femur. 



(See Blinzel, pi. iii. figs. 2-4.) 



The shaft of the right femur which I refer to this species is very 

 well preserved ; but there is no trace of the articular extremities, 

 which disappeared before the bone was imbedded in the matrix ; 

 and towards the articular ends the bone is crushed, on the posterior 

 aspect proximally, and at the distal end in front. There is, how- 

 ever, quite enough preserved to indicate a very distinct animal from 

 that referred to Cratceomus lepidopliorus (PL XXXI. fig. 5), to 

 which, however, it was nearly related in femoral character. The 

 fragment (PI. XXXI. fig. 1) is 11 inches long and ly 7 ^ inch wide 

 in the lower third of the shaft, is remarkably cylindrical, has the 

 muscular ridges on the anterior surface strongly developed, while 

 the inner middle trochanter of the shaft would not be recognized as 

 such, so feebly is it developed, were it not for the characters of the 

 other species. As preserved, the appearance of the bone is remark- 

 ably mammalian. When perfect, it may have been 15 inches long. 



The fragment of the corresponding left femur is scarcely at all 

 compressed, but was so far destroyed before mineralization that 

 only 7 inches of its length now remain, showing the lower half of 

 the shaft to be subtriangular in section, being flattened behind and 

 somewhat compressed towards the median muscular ridge in front. 



The following description is drawn from the representative of the 

 right limb (PI. XXXI. fig. 1). The bone, which is most constricted 

 in the lower third, widens in the usual way towards both proximal 

 and distal ends ; and its most remarkable feature is the inflation of 

 the proximal half of the dorsal or anterior half of the shaft in the 

 line of the median longitudinal muscular ridge. This ridge is strong ; 

 and its crest is broken into short lengths of from half to three quarters 



