ROOM III. HINDER LIMBS OF THE IGUANODON. 301 



long; the circumference of the shaft 6 inches: this, there- 

 fore, is but one-fourth the size of the specimen from Brook. 

 The lower portion of another thigh-bone, which in the cha- 

 racters of its condyloid extremity entirely agrees with all the 

 recognised femora of the Iguanodon, is but 3J inches in cir- 

 cumference round the condyles, and but 2J round the shaft 

 immediately above them; the total length of this femur, 

 when entire, could not have exceeded 4J inches. 



" In general the circumference of the shaft of the thigh- 

 bone immediately below the base of the inner trochanter, is 

 nearly equal to half the length of the entire bone; for ex- 

 ample, the large right femur from Loxwood, (No. 1,) which 

 is 3 feet 8 inches long, is 21 inches round the shaft. But 

 there are exceptions to these proportions ; thus, a femur from 

 Brook Point, presented by me to the Hunterian Museum of 

 the Koyal College of Surgeons, is relatively shorter, for it is 

 only 3i feet long, while the circumference of the shaft is 24 

 inches. The thigh-bone of the Maidstone fossil is of more 

 slender proportions. 



" The tibia is about one-tenth shorter than the correspond- 

 ing femur ; and the fibula somewhat shorter than the tibia. 



" With the view of affording a general idea of the dimen- 

 sions of the known parts of the skeleton of the Iguanodon 

 to which the largest femur in my possession belonged, the 

 following list, calculated from the average size of numerous 

 specimens, is subjoined. The length of the corresponding 

 bones in the Maidstone fossil is added for comparison : 



Isle of'wiffht Maidstone Iguanodon. 

 " Femur, length of .... 4 feet 8 inches. 2 feet 9 inches. 



Tibia 4 1 2 6 



Fibula 3 8 



Humerus 3 2 



Clavicle 3 8 



Scapula 3 4 



Metacarpals 2 



Ilium 3 10 



Metalarsals 2 



1 8 



2 4 

 2 1 



1 2 



2 6 

 1 2 



8} " 



Ungual bones 5f 



THE MAIDSTONE IGUANODON. Case 23. (See Plan of Room 

 III. ante, p. 139.) The fine old. town of Maidstone, in Kent, 



1 From a " Memoir on the Osteology of the Ignanodon and Hylaeo- 

 saurus-," published in the "Philos. Trans." for 1849, pp. 282, 283. 



