Hector.—On the Fossil Reptilia of New Zealand. 347 
excavated by a shallow pit. The enamel layer is seen, in the section (a), to 
thin out on the cement, and is not reflected to line a pulp-cavity, as in Leiodon. 
The external surface is very slightly rugose, and has a single ridge on the 
convex, or anterior, surface. The length is 1:5, and diameter ‘5, inch. 
No. 8 a.—The total stretch of the scapular arch and anterior limbs could 
. not have been much less than 9 feet from tip to tip of the paddles. The coracoid 
bones resemble Jchthyosaurus in form, being each 12 inches wide by 15 inches 
long. They are attached by a strong articular surface for 14 inches in the 
middle line, the thickened margin of the bone having been supported by 
strong ridges. 
In this fine specimen, which was obtained by Dr. Haast in a soft 
matrix of blue clay shale in the bed of the Jed River, in the Cheviot 
Hills, twenty miles south of the A muri Bluff, the coracoids were found attached 
along the mesial line by a thick massive suture, but thinning posteriorly, 
the middle portion of each bone being very thin, so that it could not be 
preserved. There are, however, at least two stout transverse ridges. The 
external anterior angle presents two articular facets, the anterior being 
one-third less than the posterior, and apparently articulating with the scapula, 
while the posterior formed two-thirds at least of the glenoid cavity. 
The general form given to the coracoids is from the sketch taken before 
the bones were removed from the soft matrix in which they were found to be 
imbedded, but the attempt to restore it from the fragments has not been 
successful, 
DIMENSIONS OF THE CORACOID. 
Inches. 
Anterior margin xi bo kn ii & 
^ Anterior articular facet ... xn seh ids ad 
Posterior articular facet ... fe AM ies 4:5 
Posterior margin Iu SU ire нет 
Mesial articulation MER ae, "ms Оо 
Greatest thickness RS t ie she 3 
Thickness of articulation of glenoid ks uo 9 
Seapula.—Of this bone only a proximal fragment, 6 inches long, has been 
preserved. It presents a quadrate articular surface, 4 incbes along the diameter 
for attachment to coracoid, and a rough deeply-grooved articular surface 
forming part of the glenoid cavity, the groove corresponding in position with 
the bicipital groove on the humerus. The bone appears to taper rapidly, the 
diameter where broken across being only 2 inches, while that of the articular 
end is 4 inches. 
Humerus.—This is well preserved in 8 a, b, and d, in every case presenting 
nearly the same dimensions and character. It is greatly thickened at the 
proximal end to form a hemispherical artieular surface and an expanded 
trochanter-like process, which are separated by a deep bicipital groove, 
