WEA.LDEN IGUANODONT AND OTHER DINOSAURS. 55 



I know, no similar detached tooth has yet been found ; but some 

 months ago Mr. William Davies, P.G.S., called my attention to the 

 portion of the right maxilla of a large reptile, represented in Plate 

 III. figs. 1, 2, 3, which he regarded as Dinosaurian. This specimen 

 was one of those collected by the late Mr. Fox in the Isle of Wight, 

 and is likewise in the National Collection. When it came into my 

 hands it merely showed the nine empty dental alveoli seen on the 

 outer border ; closer examination showed, however, on the inner side 

 of the first alveolus, what appeared to be the section of the summit 

 of a tooth (figs. 1, 3 a) with a spatulate, crescentoid crown, and on 

 chipping away a portion of the matrix and bone there was revealed 

 the summit of a tooth precisely like Dr. Wright's specimen. Further 

 development gave indications of a more imperfect tooth (fig. 16) 

 in a similar relative position to the later alveoli. These teeth are 

 only partially protruded, and were evidently destined to replace those 

 which originally occupied the empty alveoli ; the latter, in their oval 

 form and small size, agreeing with the constricted roots of Dr. 

 Wright's specimen. The maxilla is remarkably depressed, and 

 thereby closely resembles that of a Crocodile ; it exhibits three, 

 apparently vascular, foramina situated in a horizontal line on the 

 outer surface. Compared with a very minute figure of the skull of 

 Brontosaurus given by Prof. Marsh, the specimen appears to accord 

 perfectly with the maxilla ; and as it also agrees with the latter 

 skull, in being of relatively small size in proportion to the vertebrae 

 of Ornithopsis, I am confirmed in my conclusion that both Dr. 

 Wright's specimen and the maxilla under discussion are referable 

 to Ornithopsis. 



I may next mention two other bones, one of which I refer cer- 

 tainly, and the other provisionally, to Ornithopsis, both being among 

 the Fox Collection. The first (No. E. 212) is the distal half of a 

 scapula agreeing so closely with the same portion of the correspond- 

 ing bone of Brontosaurus figured by Prof. Marsh as to leave no 

 doubt of its belonging to the present form, and thereby confirming 

 the affinity of the latter with the American genus. A fragmentary 

 bone in the collection of Mr. Hulke I believe to be the distal half of 

 a coracoid, also agreeing very closely with the corresponding bone of 

 Brontosaurus. 



The second specimen (No. R. 156) is a bone which has long 

 puzzled me, but which, thanks to a suggestion of Mr. Hulke, I now 

 believe to be a left posterior sacral rib. This bone corresponds 

 fairly well with the rib of the fourth vertebra of the sacrum of 

 Brontosaurus, figured by Prof. Marsh in the 'American Journal of 

 Science,' vol. xxi. pi. xvi (1881), and is very nearly of the same 

 dimensions. I cannot regard it as belonging to Iguanodon, in 

 which genus the flattened plate of the bone is placed vertically 

 instead of horizontally. 



Now comes the consideration of the humerus (No. 28266) from 

 the Wealden of Cuckfield, in Sussex, on which the late Dr. Mantell 

 founded his genus Pelorosaurus. This huge bone, which is clearly 

 Sauropodous, is peculiar in having a distinct median cavity ; but 



