438 MR. J. W. HULKE ON THE SKELETAL [NoV. 20, 



plan. Its length, measured in a straight line, is 248 millim. The 

 proximal articular surface is convex, subtrigonal, borne directly 

 without neck on the proximal end of the bone. The base of the 

 trigone is dorsad, the apex ventrad. The antero-posterior chord is 

 41 millim., the dorso- ventrad chord is 271 millim., the sagitta is 

 about 2'5 millim. The tuberculum majus and t. minor are more 

 feebly developed. A low, indistinct trochanter is situated on the 

 ventral surface, at about 60 millim. from the proximal end. The 

 distal end presents the usual condylar form. 



Tibia (right). — Its length is 113 millim. The proximal end is 

 stout. It is obscurely divided into two areas — (1) a narrower, cor- 

 responding to the inner femoral condyle, and (2) a wider, outer or 

 posterior area, answering to the outer femoral condyle, the outer 

 border of which is slightly eniarginate, as if for the fibula. The 

 distal end is set obliquely on the shaft, so that its postero-external 

 angle is in a lower level than the antero-internal angle. Its articular 

 surface is narrow, of rhomboidal outline, with shallow trochlear 

 groove. The lengths of the tibia and femur are as 113:248, so 

 that the tibia relatively to the femur is much shorter than in 

 Eusuchia. 



Integumental Armour. 



The collection does not contain, I believe, any scutes which, by 

 associated interment, can claim to belong to Metriorhynchus ; but it 

 includes some fine examples which were found buried with bones of 

 Steneosaurus. The largest and best j)reserved of these scutes are of 

 oblong figure, with rounded-off angles. A low keel divides their 

 outer surface into two unequal areas, of which the wider is 44 millim., 

 the narrower 18 millim. across. In a second specimen, these 

 dimensions are 42 millim. and 17 millim. The larger area is quadri- 

 lateral. It is indented with a pattern of lines and long pits which 

 radiate from the highest point of the keel, diminish as they recede 

 from this, and cease near the border of the scute. The anterior 

 border is thin, and a submarginal tract of the surface within it is 

 smooth, unornamented, and plainly articular, being, where in undis- 

 turbed natural position, overlaid by the posterior border of the 

 scute next in front of it. The lesser one is crescentic, quite smooth, 

 and it was doubtless overlaid by the applied border of the adjoining 

 scute. The smooth submarginal band of the larger area and the 

 crescentic lesser area meet in a tongue-like projection, in which the keel 

 runs out anteriorly. This tongue, when the scutes are articulated, 

 is received in a corresponding hollow in the deep surface of the 

 scute next in front. The whole of the deep surface is smooth, its 

 grain radiates from a point beneath the highest part of the keel, 

 where the scute is thickest. 



In their form and in their plan these scutes correspond so closely 

 to those placed in single series along each side of the dorsal middle 

 line of the trunk in D' Alton and Burmeister's figure of the ' Gavial 

 of Boll,' that there cannot be any doubt of their having also occupied 



