114 Prof. li. G. Seeley on the 



that these bones arc portions of one animal, the tibia would not 

 be less than 15 inches long". Both proximal and distal ends of 

 the bone are typically Saurischian, and may be compar^'d with 

 Palaosaurus and AgrosauruSy but are well distinguished by 

 the shaft being less constricted and the distal end more com- 

 pressed from front to back. The length of the proximal 

 fragment is about 6i inches, while the distal fragment 

 measures 5^ inches. The proximal articular surface has the 

 usual subtriangular form and is inclined a little backward ; 

 its extreme length is 4y(, inches and extreme width over 

 3 inches. The internal border is convex, though the con- 

 vexity is broken by two angles. The posterior surface has 

 the usual intercondylar notch, and the outer side is longitu- 

 dinally channelled by the fibular groove, which helps to 

 define the cnemial crest, which is moderately compressed 

 from side to side. The anterior margin is at first slightly 

 convex and the posterior margin concave, as it extends down- 

 ward. The transverse width at the fracture is about 1^% inch. 

 The distal end at its superior extremity is about 1^ inch wide, 

 but the distal articular surface has widened regularly, so that 

 the bone is about 1-nr inch from back to front, and 2^ inches 

 from side to side, sup])Osing tlie slight notch in connexion 

 with the astragalus to be towards the fibular border. 



The distal articulation is irregularly four-sided, the ante- 

 rior border being shorter than the posterior border, which is 

 obliquely truncated by the short inner border. The distal 

 surface is divided into two portions, anterior and posterior, by 

 a wide groove, there being a descending area for a talon 

 towards the antero-external side. These limb-bones have 

 large internal cavities. The forms of the ends only indicate 

 a generic difference from Palceosaurus and Agt'osaurus, in 

 neither of which is the bone relatively so wide transversely. 



Bones oj the foot. 



All the bones of the foot which are preserved appear to 

 belong to the same limb. They make known the metatarsus 

 and phalanges, but do not aflford any evidence of either the 

 number of digits or number of phalanges in a digit. 



The first metatarsal no. 374 is short and broad, about 

 2^ inches long by If inch wide. Other metatarsals apjjear 

 to indicate that the longest did not exceed 6 inches in length : 

 but they are all represented by fragments. They have the 

 proximal ends deep, tlie form of the bone slender, witii the 

 distal end but little expanded. No. 367 has a depth of 

 2 1 inches at the proximal end, but only -^jj of an inch at the 



