282 PETRIFACTIONS AND THEIE TEACHINGS. CHAP. III. 



produced into one or more apophyses as in the Monitors, 

 Iguanas, &c. ; and instead of a perforation in the neck of the 

 bone for the passage of vessels, there is a deep fissure or notch, 

 separating the glenoid cavity from the scapular facet." 1 A 

 reduced figure of a coraceid of this kind is given in Lign. 58. 

 In the collection, there are portions of other coracoids of the 

 same character. 



LIGN. 58. 1. CORACOID : 2. SCAPULA; OP THE IGUAXODON. TILGATE FOREST. 

 (i nat. size.) 



SCAPULA OF AN UNKNOWN REPTILE. Wall-case C. Over r 

 the above specimen, there is a very remarkable bone which it 

 will be convenient to notice in this place. It is thus 

 described in my Memoir, " Philos. Trans." 1841 : "A scapula 

 or omoplate eighteen inches long, associated with bones and 

 teeth of the Iguanodon, and probably referable to that animal, 

 presents, like the coracoid, some important modifications of the 

 usual lacertian type. This bone is very thin and flat, and of 

 an elongated form ; it differs considerably from the omoplate 

 of the Monitors and Iguanas. It somewhat resembles the 

 scapula of the Seines, and it throws off a long tripartite apo- 

 physis (a, &,) which is imperfect in the only specimen hitherto 

 discovered ; this process probably afforded support to a carti- 

 laginous arch as in the existing lizards. 



" But although, from circumstances which it is unnecessary 



1 From my Memoir in " Philos. Trans." 1841. The reader will please 

 to remember that at this period Professor Owen had not entered on 

 this department of Palaeontology, which he has since so greatly advanced i 

 by his anatomical knowledge and indefatigable labours. 



