654 



PROF. K. G. SEELET ON THE REPTILE 



One such fragment as preserved is about 5 inches long and rather 

 wider, with apparent!}' two slight keel-like ridges parallel to each 

 other. The greatest height of the crest in this specimen is about 

 |f inch. 



If all this armour is correctly referred to the genus Cratceomus, 

 it furnishes one of the most distinctive generic characters of this 

 type. I do not remember any described genus in which large 

 tubercled plates such as are here figured have been found, though 

 an isolated plate was described from the Wealden of the Isle of 

 Wight many years ago* as showing a not dissimilar ornament. 

 Other plates are so similar to armour of Scelidosaurus, especially the 

 median-keeled caudal plates, as to enable us to concur with Biinzel 

 in recognizing a strong affinity to that genus, which, however, does 

 not amount to identity. Cratceomus was more heavily armoured. 

 It is difficult to say whether its armour has more in common 

 with the bony tubercles which occur on the limbs and tail of many 

 Chelonians, or approximates better to the bony scutes of certain 

 lizards and crocodiles ; for it is so distinct that no near parallel 

 can be drawn between the armour of Dinosaurs and that of living 

 reptiles ; nor if the comparison were possible would it have much 

 weight as a mark of organic affinity. 



Scapulce. 



Three specimens of Dinosaurian scapula) have been obtained ; two 

 are larger than the other, and belong to a distinct species. The two 

 larger specimens were figured by Biinzel, and regarded by him as 

 left ribs of his imaginary Lacertilian genus Danubiosaurus and the 

 type of his species D. anceps. They are left scapulae. The smaller 

 specimen obtained subsequently is a right scapula. I refer the 

 larger bones to the animal indicated by the larger limb-bones (Cra- 

 tceomus Paivlowitschii), though, as the smaller specimen is little more 

 than half the size, the disproportion in the scapulae is much greater 

 than would have been anticipated in the two species. 



Left Scapula. 

 (See Biinzel, pi. v. figs. 7-9, pl.vi. figs. 1-3.) 



The scapula (rig. A, p. 656) is remarkable for its great breadth, its 

 curved form, its compressed aspect, and the remarkable acromial pro- 

 cess in which its slight spine terminates. The specimen has been a 

 little crushed, and is not quite perfect at its distal end ; the whole 

 surface for union with the coracoid is destroyed by decomposition, and 

 slightly injured by fracture. What remains of the articular surface 

 for the humerus is a semiovate surface 5| centim. wide and rather 

 longer. It is margined by an elevated ridge, has the usual roughness 

 of cartilaginous surfaces, andismore concave than usual, both in length 

 and breadth. The inner or visceral margin of the bone appears 

 to have been more convex than the external margin. Both are 

 somewhat inflated ; and the external surface and posterior margin 



* J. E. Lee, Ann. & Mag. Nat. Hist. vol. xi. p. 5, reprinted in his ' JNote 

 Book of a Geologist.' 



