
540 RECORDS OF THE S.A. MUSEUM 
the stylohyals are much as described for the adult except that the articular facets 
on the widened proximal ends are relatively narrower. 
The ventral element of the atlas and the rest of the cervical vertebrae are 
fused together into one solid mass (pl. xviii, fig. 5-7). The dorso-lateral part of 
the atlas is quite free (pl. xviii, fig. 8) but none of the remaining cervicals is 
marked off dorsally or dorso-laterally. The height of the eervicals (85 mm.) is 
slightly less than the greatest width (88 mm.), the latter being that of the free 
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16 


Fig. 15-16. Sterna of adult female and calt 
from Port Victoria. Fig. 17. Sternum of Sleaford 
Bay example (14 nat. size). 
portion of the atlas. On the right side of the ankylosed mass there is a large 
foramen, partially divided by an incomplete bony bar; on the right side two distinct 
foramina occur posterior to the axis, the hinder one being twice as deep as the 
other. The median dorsal spine at the rear of the cervical complex is low and 
rounded. In front of it the mid-line of the mass and of the atlas is sharply ridged, 
not rounded as in the adult, 
The thoracic vertebrae are thirteen in number. The neural arch of the first 
is complete and the eanal is about one-fourth as wide again as deep; on either side, 
ventrally, a small portion of the centrum is fused with the last cervical (pl. xviii, 
fig. 6-7). The epiphyses are trapped in the narrow space between cervicals and 
first thoracie¢ but are quite free. 
There are ten lumbar vertebrae and twenty-three caudals, making a total 
