ROOM III. CLAVICLE OF THE IGUAXODOX. 281 



For." and "Geol. S.E. of England," under the provisional 

 name of Clavicle. 



" This bone is long, slender, slightly arched, of a prismatic 

 form in the middle, and enlarged and flat at both extremities. 

 At the distance of not quite one-third from the widest (sternal) 

 extremity, a small apophysis is sent off, and the bone then 

 enlarges and terminates in two unequal flat processes. A 

 perfect specimen is 29 inches long, and 3^ inches wide at the 

 expanded sternal end ; and there are portions of others, indi- 

 cating a total length of 3 feet. In the Maidstone Iguanodon 

 there are two bones of this kind in a mutilated state. In 

 none of the skeletons of reptiles, nor indeed of any other 

 animals to which I have had access, are there any bones 

 with which the fossils can be identified. Mr. Owen pointed 

 out to me a bone attached to the coracoid and omoplate of 

 a small lizard that bore some analogy to the fossil; 1 and 

 I have no doubt that a more extended anatomical investi- 

 gation will ere long afford a solution of the question. It is 

 satisfactory to find that the correctness of my first appro- 

 priation of this bone to the Iguanodon many years before it 

 was found in connexion with any part of the skeleton, has 

 been confirmed by subsequent discoveries. Doubtful, how- 

 ever, whether this bone should be regarded as a clavicle, I 

 propose to distinguish it by a distinct name, Os Cuvieri, till 

 future discoveries demonstrate whether it is a new element 

 superadded to the pectoral arch of the colossal herbivorous 

 saurian whose structure is in other respects so anomalous, or 

 a true clavicle."* Subsequent discoveries have established 

 the correctness of my original conclusion. 



CORACOID OF THE IGUAXQDOX. Wall-case C, uppermost shelf, 

 (ante, p. 227.) " A coracoid bone, ten inches wide, was found 

 imbedded in a block of Tilgate grit with bones of the Igua- 

 nodon. It resembles in its hatchet-like form the corresponding 

 bone in the lacertians, and its articulating surface furnishes, as 

 in that family, one-half of the glenoid cavity for the reception 

 of the head of the humerus ; but its margin is entire, and not 



1 " The bone attached to the coracoid and omoplate of a small lizard 

 which I pointed out to Dr. Mantell as resembling the one in question, 

 was the clavicle of Cydodus nigroluteu8."Prof. Owen in Brit. Assoc. 

 Report, p. 136. 



2 "Philos. Trans." 1841, p. 137. 



