Annals of the South African Museum. 



diameter of just over 1 mm.; the probable 6th, which is the largest, 

 has a diameter of 7'5 mm. The teeth do not increase nor decrease 

 regularly in size from front to back of the jaw, but are variable. 



The surface of the maxilla is plentifully supplied with grooves 

 and small foramina for blood-vessels. 



The nasal is an extremely long bone forming the upper surface 

 of the skull from the tip of the snout nearly to the plane of the 



Fig. 10. Top view of skull of Sphenosuchus acutus Htn. 



(Slightly restored.) 



X 



front of the orbit. It forms none of the posterior border of the 

 nostril. The greatest width across the pair of bones is 20 mm. 

 at the back while the length is about 88 mm. 



The lachrymal forms the whole of the upper border and most of 

 the posterior border of the antorbital vacuity, besides forming the 

 larger part of the anterior orbital border. 



The prefrontal is a small bone lying between the frontal, nasal, 

 and lachrymal. Below it has a lobe-like extension articulating with 



