ROOM III. SCAPULA OF AN UNKNOWN REPTILE. 283 



to detail, I entertain but little doubt that the coracoid and 

 omoplate above described belong to the Tguanodon, it is so 

 hazardous in palseontological inquiries to affirm as certain what 

 is merely probable, and so many impedi- 

 ments to accurate inductions have been 

 occasioned by hasty and positive determi- 

 nation of a tooth or bone from imperfect 

 analogies, that I deem it necessary to 

 repeat, that these specimens were not 

 found in juxta-position with other parts of 

 the skeleton of the Iguanodon, but merely 

 imbedded in the same mass of stone." 

 Philos. Trans. 1841. 



SCAPULA OF THE IGUANODON. Lign. 58. 

 The prudence of the above reservation 

 was shortly demonstrated by the disco- GATE FOREST. 

 very of a scapula of a very different type, 

 of which a reduced sketch is given in Lign. 58, and which 

 unquestionably belongs to the Iguanodon : the scapula above 

 described must therefore be referred to some other genus of 

 the Wealden reptiles ; it may possibly belong to the Megalo- 



1 Professor Owen in " Reports on Brit. Foss. Kept" offers the following 

 remarks on this unique and peculiar scapula : 



" The scapula has not hitherto been discovered so associated with other 

 unequivocal portions of the skeleton of the Iguanodon as to permit the 

 characteristics of this bone to be confidently recognised. The bone, (No. 

 194, Omoplate of Iguanodon, Mantettian Catalogue,) agrees with the 

 undoubted scapula of the Hylaeosaurus, and with that of certain lacer- 

 tians, especially of the genus Scincus, (Dr. Mantell has pointed out this 

 resemblance in his Memoir in the 'Phil. Trans.' 1841,) in the produc- 

 tion of a long slender pointed process, continued at nearly right angles 

 with the body of the bone, from the anterior part of the articular surface 

 for the coracoid ; but it differs from the scapula of the Hylaeosaurus in 

 the presence of two short processes given off from the lower part of the 

 base of the long process, and in the absence of the thick and strong 

 transverse acromial ridge which overarches the glenoid depression, and 

 in the deeper concavity of the posterior margin of the ascending plate 

 or body of the bone. This part, in its shape and relation, length and 

 breadth, is intermediate between the crocodilian and lacertian type of 

 the scapula, at least as exemplified in the monitors and iguanas, where 

 it is broad and short. The Seines and Chameleons, in the more croco- 

 dilian proportions of their scapulae, resemble the Hylaeosaurus, and the 

 great species of extinct saurian, most probably the Iguanodon, to which 

 the present bone belongs." Brit. Ass. Rep. p. 134. 



