Tij2)e, of the Genus Massusjjondylu.s, 



113 



Tlie fra<rnuMit of the sliaft sliowinj: tlie lateral trochanter 

 appears to belong to a smaller individual. It shows that the 

 troehanter was lon<;itudinal, e( impressed, and directed down- 

 ward to a de])th in that specimen of about y^,, inch, recallin;^ 

 the condition in ]\il(i'otiaarus and Znnclodon. 



'J'he distal fragment at its proximal extremity is 2 inches 

 M'ide, and rather thicker, owing to the breakage occurring at 

 the base of the lateral troehanter. The bone widens distally 

 to 4 inches. The external border is rather more concave 

 than the internal border. The thickness is about l-j**,, inch 

 where the elevation below the trochanter has subsided ; but 

 at the distal extremity the development of the condyles gives 

 the bone a thickness of 2-j^y inches. The distal condyles are, 

 as usual, a large internal, vertically ovate, prominent process 

 and a smaller external condyle, external to which is the 

 usual oblique external infero-lateral area, though much less 

 compressed than usual, so that it produces a convex inflation 

 of the external distal side of the bone. There is a deep 

 groove between the two condyles, and this divides the distal 

 articular end in a broad U-shape into two nearly equal but 

 unsymmetrical parts. In this respect also the bone is inter- 

 mediate between Palieosaui its and Zanclodon. 



The Tibia. (Figs. 8 and 9.) 



The bone no. 363 is the proximal end of a riglit tibia (fig. 8) 

 more perfect than 365, which is the corresponding proximal end 



Fie:. 0. 



Fig. 8. 



Fig. 8. — Proximal end ofri^rlit tibia, soon from above. 



Fig. y. — Anterior asinct of tlie distal end oi the left tiLia. -3 uat. size. 



of the left tibia ; 364 is the distal end of a left tibia (fig. 9), 

 j)robably Irom the same individual as 365. On the hypothesis 

 Ann. <£• 31a(j. N. Hist. Ser. 6. Vol. xv. 8 



