Prof. H. G. Seeley on Euskelesaurus Brownii. 333 



side to side than in any other carnivorous Saurischian, but 

 about intermediate between the depressed claw of Iguanodoti 

 and the compressed claws of Megalosaurs. 



The digital phalanges are relatively short and all substan- 

 tially of the same type, only varying a little in dimensions 

 with the size of the digit. The longest and largest are the 

 two bones in the Paris collection, the more proximal of which 

 exceeds 2h inches in length in the middle, which is the least 

 length, and the second is about 1^ inch in the same measure- 

 ment ; but the total length of the two bones as naturally 

 connected exceeds 4| inches. The bones are characterized 

 by a well-rounded, distal, pulley-shaped end, with the interior 

 surface widening and becoming more inflated and elevated as 

 it extends backward. A shallow median concavity divides 

 the distal surface into two nearly equal right and left parts, 

 and behind and above the channel in front there is usually a 

 considerable depression. At the sides of the pulley are deep 

 concavities for ligamentous union. The inner side is the 

 more nearly vertical, the outer more inclined. The superior 

 surface is more or less flattened, with a tendency to convexity 

 from side to side and concavity from behind forward. The 

 proximal end increases in depth and width, being always 

 wider than deep, forming the half of a vertical ellipse, the 

 contour of the base being flattened and the sides and upper 

 surface being convex. The superior and inferior outlines of 

 the proximal end are convex from side to side, owing to the 

 middle part of these surfaces being prolonged as a sort of talon 

 upon the adjacent trochlear surface of the bone which is 

 proximal to it in position. This proximal mai'gin is roughly 

 ligamentous all round. 



Although eight digital phalanges are indicated by Mr. 

 Brown's specimens, they are all more or less imperfect, and 

 three are only fragments. One of the smaller specimens, 

 numbered by him 16, is If inch deep at the proximal end, where 

 it is rather less than 2 inches wide, this surface being evidently 

 slightly narrower than the distal end of the bone, which fits 

 into the proximal surface. The distal end is less than 1£ inch 

 deep; its transverse width does not exceed 1^- inch. The 

 length in the middle of the side is on the inner side If inch 

 and on the outer side less than 1 inch. In some specimens 

 the base is divided into two nearly equal parts by a transverse 

 groove behind the distal pulley, but in other specimens the 

 trochlear surface appears to be relatively smaller. What 

 appears to be the outer side is frequently concave. 



The distinctive features of these phalanges are the compa- 

 ratively flattened base, the superior and inferior median 

 Ann. & Mag. N. Hist. Ser. 6. Vol. xiv. 23 



