14 
FOSSIL REPTILIA OF THE 
space between the inner condyle and the slightly dislocated ulna. These are more 
probably parts of the scattered dermo-skeleton than tendinal sesamoids of the 
extensor of the forearm 
The acromial end of the ulna (Tab. Ill, 5 . 5 ) presents a convex border 2 inches 
2 lines in breadth. The mutilated head of the radius (ib., 54 ), preserving its natural 
relations to the outer condyle of the humerus, is 1 inch 6 lines in length. 
The shafts of the radius and ulna, with the rest of the bones of the fore limb, 
have been broken away. 
Four oval, dermal bones, like those overlying the humerus and ulna, are attached 
to the matrix in front of the humerus and radius. 
Behind the fractured sternal end of the right coracoid (Tab. II, 52 ) is the dislo- 
cated head ( 53 ) and anterior expanded pectoral process (|> ) of the right humerus 
(ib.), showing a thickness of 7 lines where it has been broken off. The transverse 
diameter of the humerus at this part is 6 inches, with a thickness of the shaft not 
exceeding 2 inches 9 lines, showing that the humerus in Scelidosaurus was more 
expanded and compressed proximally than in any existing reptile, and in this 
respect resembling the same bone in the Dicynodonts. 
The proportions of the entire fore limb of Scelidosaurus , as indicated by the 
length of the humerus, would be those of the same limb in Teleosaurus. The 
humerus is shorter than the scapula, barely equalling the extent of four coarticu- 
lated middle dorsal vertebrae. There is no trace of clavicle in the present specimen ; 
the functions of the fore limb seem, therefore, to have been less important in regard 
to locomotion on land than in Iguanodon, Megalosaurus, and modern Lizards. Yet 
the shape and proportions of the coracoid, as I pointed out in regard to the 
Stago7wlepis wdien the remains and impressions of that reptile were submitted to 
my inspection by Sir Roderic I. Murchison, at Leeds, during the meeting of the 
British Association, September 24th, 1858,* show the distinction from the Croco- 
dilian order and the affinity to the Thecodontian order and to modern Lacertilia, 
or give evidence of a more generalised reptilian character, in these extinct reptiles 
with dermal bones and scutes of the Lower Liassic and Upper Triassic deposits. 
Pelvic Arch and Limb. Tabs. YI, X, XL 
The left iliac bone (Tab. VI, figs. 1 and 2, 62 ) retains almost its natural 
relations with the sacrum. The right iliac hone (ib., 62 ) has been obliquely 
dislocated. It is a long bone, with a sigmoid flexure (ib., fig. 2, 62 ), convex 
* Art. “ Palseontology,” ‘Encyclopaedia Britannica,’ vol. xvii, p. 130, in which, in reference to the 
Elgin matrix of Stagonolepis, it was stated that “ no characteristic Devonian or Old Bed fossils of any 
class have been discovered associated with the foregoing evidences of reptiles, which, according to the 
determination of strata by characteristic fossils, would belong to the secondary or mezozoic period.” 
