Remains in Magnesian Conglomerate. 355 



Femurs. — Plate XXX., fig. 3, 4, and 4a, reduced to one half. 



Two femurs, in a tolerable state of perfection, have fortunately been 

 found ; one, of the right side, exhibiting nearly the whole of the bone, the 

 inferior condyles only wanting. Fig. 3. 



The other is of the left side, and exhibits the condyles, but is very imper- 

 fect at the superior extremity. Fig. 4, 4a. 



The first mentioned (Plate XXX., fig. 3.) measures 10 inches in length; 

 from the head to the middle of the trochanter, 3 in. -fVths ; from the trochan- 

 ter to the inferior condyle, 5 in. -V^hs. 



In the left femur the transverse diameter of the condyles is 2 in. -Vths, 

 the centre of the cylinder I inch. 



They are curved in two directions upon the axis, giving them somewhat a 

 twisted form, or the shape of a longyantero-posterioriy. 



The trochanter is well preserved, wedge-shaped, and of considerable size, 

 as may be seen by reference to the figures. 



The articular head is flattened at the space between the trochanter ; and the 

 articular extremity is more curved than any other part of the bone ; the centre 

 is nearly round, but a slight elevation or ridge exists on its posterior surface, 

 in the situation of the linea aspera of the human femur. 



The condyles are flattened, the outer one being the larger ; there is a deep 

 depression between them posteriorly, and a very slight one anteriorly. 



On an attentive comparison of these femurs with those of the Crocodile and Megalosaurus we 

 again recognise a resemblance. 



A comparison with the femurs of the Monitors evidently shows that our animal cannot have be- 

 longed to that family. 



The femurs of the Monitor are much less curved, being nearly straight, and the trochanter is 

 much nearer the articular extremity, characters sufficiently showing a wide difference between 

 them. 



Ischium. — Plate XXX., Fig. 5, reduced to one half. 



The narrow extremity of the bone given in this figure, we presume to have 

 been the acetabular, but destroyed ; the opposite end, which is of considerable 

 width, joined its fellow ischium on the median line ; it is in this part spread 

 out very much, being 5 in. -rV^hs across where widest, whilst at the opposite 

 end it is only 1 in. —ths. The wide end is deeply concave in the middle, 

 the lateral edges turning down ; this inversion of the edges, although existing 

 in the Crocodile, is much less in that animal than in our bone. 



In the Monitor (Ouaran, Lacerta Nilotka) in our possession there is not so great a difference m 

 the two ends of the Ischium, neither is the wide one so much hollowed ; our fossil bone is likewise 

 VOL. \. SECOND SERIES. 3 A 



