344 Annals of the South African Museum. 



from the eighth. The roots are long and nearly circular in cross- 

 section. Half-way up the crown on the inner side is a cingulum 

 above which the crowns are laterally compressed, so that seen 

 from above they are considerably longer than broad. Above the 

 cingulum on the inner side the crown slopes upwards and outwards 

 and the thinning of the crown thus produced is also accentuated 

 apparently by a somewhat inwardly-directed slope of the outer 

 face. Each molar from the 4th onwards is provided with two 

 cusps, a large anterior cusp occupying two-thirds of the grinding 

 surface, and a much smaller, somewhat lower posterior cusp. On 

 the inner face there is a groove running between the ridges which 

 descend from the cusps to the cingulum. The second and third 

 molars are provided each with an additional cusp in advance of the 

 large one which has been called the anterior cusp ; and to a lesser 

 extent this feature is also seen on the first and fourth molars. The 

 crowns are but scarcely worn. The outer side is unfortunately not 

 seen, but its general characteristics can be obtained from the im- 

 pressions of the 8th, 9th, and 10th molars. 



The total length of the fragment as preserved is 46 mm. The 

 crown of the canine is 19'5 mm. high, and 7 mm. long at the base. 

 The first ten molars together occupy a length of 33 mm. At the 

 canine the depth of the dentary was about 17 mm. 



Type. Portion of lower jaw with teeth. S.A.M. Cat. No. 3606. 



Locality. Paballong, Mount Fletcher, C.P. 



Horizon. Red Beds. 



SUPER-ORDER ARCHOSAURIA. 



FAM. SPHENOSUCHIDAE nov. 



SPHENOSUCHUS ACUTUS, Htn. 



Text figs. 916. 

 1915. Haughton. Ann. S. Afr. Mus. XII, 3, p. 98. 



Since the original description of this form was published a cer- 

 tain amount of additional development has been done upon the type 

 specimen, which necessitates slight additions and emendations. It 

 has been thought best, therefore, to recast the description. 



The skull is somewhat crushed but nearly whole, and shows all 

 the external details. It is larger than that of Euparkeria, and is 

 comparatively more pointed, longer, and narrower. The orbits are 

 rounded, and wholly in the posterior half of the skull. The supra- 



