610 PROF, H. G. SEELEY ON THE DINOSAURIA OF 
terior outline is moderately concave, while the anterior outline is 
more concave, rounding distally into a convex outline, which is par- 
tially broken away. ‘The specimen is 34 inches long, and, where 
fractured, the ascending shaft is 13 inch wide, ,%, thick, and more 
compressed on the inner than on the outer margin. The distinctive 
feature of the bone which separates it from other scapule is the de- 
velopment towards the humeral side of a massive quadrate spinous 
process (fig. 3,6), which increases the thickness of the bone to 23 
inches. It is $$ inch wide, margined posteriorly by a sharp ridge, 
anteriorly by a rounded ridge, is rounded inferiorly almost as per- 
fectly as a pulley surface, and flattened externally till it merges, 
after about 2 inches, in the free end of the scapula. It extends to 
within about half an inch of the humeral articulation, and is di- 
rected obliquely forward across the bone. 
Tue Fore Linus. 
Humerus.—Only the right humerus is preserved (Pl. XXXV. 
figs. 4,5). It has been fractured by a blow from a digger’s pick, 
which has removed the middle portion of the shaft and broken away 
the radial crest. The distal articular end is imperfect, owing to 
decomposition of the bone before fossilization, and its decayed sur- 
face, like the body of the shaft, is overgrown with Plicatule. The 
humerus is larger than might have been anticipated in an animal 
otherwise giving indications of a semierect position. It was probably 
not less than 9 inches in length, evidently possessed a long and 
compressed radial crest, which reached at least halfway along the 
bone, had the proximal end massive and the distal end fairly ex- 
panded, while the lower part of the shaft was constricted in the usual 
manner. As preserved, the specimen at the proximal end (fig. 4) is 
nearly flat on the ventral surface, with the slightest indication of con- 
cavity from side to side. The extreme width from side to side is rather 
less than 3 inches, as preserved; but the bone was somewhat wider, 
since no part of the radial crest is preserved, though its limit is indi- 
cated by a slight reflection downward of the margin of the frag- 
ment at the fracture (fig. 4,a@). The radial crest appears proximally 
to have been about half an inch thick, and to have extended to within 
about three fourths of an inch of the proximal end of the bone. 
It is separated from the articular head by an oblique region, which 
is somewhat compressed, less than 1 inch long, a little concave 
in length, and rounded from side to side. The head of the bone 
(fig. 4, 6) is subovate, but the margins of the articular surface 
are a little worn or decayed. It is slightly convex in its long 
diameter, from the ulnar to the radial side, which measures about 
1,°, inch, and rather more conyex from the dorsal to the ventral 
side, where it measures about 1,8 inch. Its margin bulges con- 
vexly on the dorsal aspect, but not so markedly as in some other 
Dinosaurian types, such as Hadrosaurus; it is even less than in 
the humerus attributed to Hyleosawrus, and is perhaps more nearly 
like Scelidosaurus, though the resemblance would appear to be closer 
to another and undescribed Dinosaurian genus from the Lias. ‘The 
proximal articular surface is smooth, though marked by irregular 
