Hectok. — On the Fossil Re'ptilia 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 pulprcavity, as in Lelodon. 

 The external surface is very slightly rngose, and has a single ridge on the 

 convex, or anterior, surface. The length is r5, 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 Icltthyosaurus 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 Rivei-, in the Che\iot 

 Hills, twenty miles south of the Amuri Bluff, the coracoids wej-e found attaclied 

 along the mesial line by a thick massive suture, but thinning posteriori}', 

 the middle portion of each bone being very thin, so that it could not be 

 preserved. There ai"e, 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. 



Anterior margin 



Anterior articular facet ... 



Posterior articular facet ... 



Posterior margin' 



Mesial articulation 



Greatest thickness 



Thickness of articulation of deuoid 



Inches. 



8 



3-5 



4-5 

 14 

 15 



3 



3 



Scapula. — Of this bone only a proximal fi'agraent, 6 inches long, has been 

 preserved. It presents a quadrate articular surface, 4 inches along the diameter 

 for attachnjent to coracoid, and a rough deeply-grooved articular surface 

 forming part of the glenoid cavity, the groove corres[)onding in position with 

 the bicipital groove on the humerus. The bone appears to taper rapidly, t' 

 diameter where broken across being only 2 inches, while that of the ai L„j.' ;r 

 end is 4 inches. 



Humerus. — This is well preserved in 8 a, b, and d, in every case pi-esenting 

 nearly the same dimensions and character. It is greatly thickened at the 

 proximal eud to form a hemispherical articidar surface and an expanded 

 trochanter-Iike process, which are separated by a deep bici2)ital groove, 



