PECTORAL GIRDLE
The girdle consists of the scapulae and coracoids as usual in the dinosaurs. Sternal bones were not found.
Scapula–This bone is unusually heavy and wide in the blade and it is firmly united with the coracoid. The photograph (Plate III) and the comparative measurements will serve to define it.[1]
COMPARATIVE MEASUREMENTS OF SCAPULA
Parasaurolophus |
Corythosaurus |
Kritosaurus |
Saurolophus | |
|---|---|---|---|---|
| Total length | 940 | 890 | 776 | 800 |
| Maximum width of blade | 248 | 200 | 189 | 220 |
| Width at articular end | 235 | 214 | ||
| Length of glenoid cavity | 125 | 110 | ||
| Width of glenoid cavity | 75 | 64 |
It will be observed that the scapula is of greater length than that of Saurolophus: it is surpassed only by that of Claosaurus annectens (970 mm.). It shows a greater width of blade than any other form of which I can find a description.
Coracoid (Fig. 3)–Neither of the coracoids is well preserved: the left is in better condition and is shown, with considerable adjustment, in Figure 3. The bone is firmly united with the scapula and the foraminal notch is closed as in all trachodonts with the exception of Kritosaurus. The following rather uncertain measurements indicate the size of the bone. The glenoid cavity has a transverse width of
- ↑ Owing to disregard of an erratum slip accompanying Barnum Brown’s paper on Saurolophus osborni, some of the measurements quoted in University of Toronto Studies, Geological Series, No. 11, are transposed. In the table on page 41 of that study, II should read Saurolophus osborni, III Trachodon mirabilis, and IV Claosaurus annectens.
